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Gregory G. Jones, of Southlake, and his law office were sued in Tarrant County Court on Tuesday by France/US Investment LLC, Codechem US LLC, K&K Energy LLC and Financiere Sittler US LLC. The plaintiffs claim they hired Jones in 2009 to represent them in ...

Clients Say Lawyer Steered Them to a Ponzi

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CodeChem is a software development company incorporated in Canada and North Macedonia. It is founded by software engineers and technology lovers who have significant experience as technical leaders and system architects in the companies they’ve worked for before. By 2021 the company grew to +45 people hiring some of the best talents in North Macedonia and worked successfully to put this talent into an environment that nourishes professionalism. In a world of technologies, platforms and frameworks expansion our main goal is to find the right balance between exploitation and exploration of our knowledge. The main reason CodeChem was founded was exactly this, to try and apply working model where every individual will consider their job as: - Lifelong learning; - An art of creating the most elegant solutions to the problems they are faced with; - Help their peers to achieve these ideals. --- We offer complete SDLC services including Product Planning, System Architecture, UX&UI Design, Development, Project Management, QA, and Support & Maintenance. We work as an independent project team or integrate as part of a pre existing team, flexible to each project’s needs. The more complex the problem, the more excited we are solving it.

CodeChem

The year was 2007. There were two guys who just moved to San Francisco. Both were unemployed, so they faced the trouble of paying rent. Suddenly, they realized that all the hotel rooms in San Francisco were reserved because the local industrial design conference at the time attracted a large number of visitors. And this is how it all started... A minimum viable product was born. They came up with the idea of providing accommodation for people coming to town. They took a few pictures of their apartment, launched a basic website, and promoted it to people who were coming to San Francisco for a design conference. And this is how Brian and Joe built AirBnB! Brian and Joe's concept is what we call an MVP Development nowadays. WHAT IS AN MVP? MVP is a version of your product you want to launch with and features. Besides that, those futures should also cover 3 other areas: minimal functional = no bugs, no crashes, no disappointment. Reliability = simple UI and legibility. Usability = unique, lovable, friendly, and usable. User Experience This MVP Pyramid Model from Jussi Pasanen perfectly illustrates the issue: "Build a slice across, instead of one layer at a time". Be sure that less functionality doesn't mean poor quality. In fact, in a competitive digital world, the product you build to achieve user traction needs to be more than just a few lines of code well kept into a repository. It needs to fit into the everyday environment, create emotion, solve real problems, and tell a story while it does all that. By going with an MVP first, you can drastically increase your chances of success. It allows you to fit into the market in a short time with a small budget and satisfy early adopters. It is very important to note that an MVP is a process of collecting feedback. It’s not a finished product. In other words, once the minimum viable product is launched, you await valuable feedback for future product developments. Тhat will allow you to continue improving and developing your MVP. One day, your MVP will become a fully-fledged product. One of the places for collecting feedback for your MVPs is the place where early adopters like to spend their free time — on ProductHunt. We all know that launching a new product is a complex process and can be tricky, especially for startups. Most failures happen in a scenario where there is no research on the needs and limits of the market, adequate cash flow, or if the product is not user-friendly. Now that we’ve established what an MVP is, let’s figure out how to build an MVP right. So, you should follow these 5 steps: Analyze the market and your competitors, Figure out what problem you’re solving, and for whom, List all necessary features and prioritize them, Develop your MVP, Launch! 🚀 Step 1. Analyze the market and your competitors It may happen that the idea doesn't fit the needs of the market. Before you start building an MVP, make sure it fulfills the needs of your target users. Cover the most suitable market for the start. In our experience, it is not optimal to spend most of the resources only on market research especially if it is a new product. If there is already a product similar to the one you want to launch on the market, it is important to do a competitor analysis. It'll help you make your product more unique. You can be inspired by the competition and tweak the product in order to gain a competitive advantage. Another crucial step before you start building the MVP is to get early feedback from experts. They can give you valuable and wise advice and guide you along the way to completing your future MVP! Step 2. Figure out what problem you’re solving, and for whom: The first thing of successful MVP development is your idea. Start by asking yourself: validating Who will my product? use What (time, money) does my product offer? value What do I solve? problem What is the ? core functionality What determinates ? success and failure can I deliver it? When When and how much will it bring? revenue Step 3. List all necessary features and prioritize them Don't forget that the MVP must be low-cost, practical, and delivered in the short time scope previously defined. As soon as you’ve defined all the steps, you can start creating a list of particular features for each stage. Then, you need to prioritize them. For better understanding, we can define a user flow for our core features. One of the most important questions is what will make your users intrigued and happy to see. The core features of your product, The should-have features, The nice-to-have features. When you’ve prioritized all the features, you may define their scope for the first version of the product and start to build the MVP. By creating a prototype you can have a better grasp of how your future product would look like. Consider prototyping as an MVP to build an MVP: not a fully functional version, but a version to help visualize the look and feel of the product. In our experience, an iterative approach would be the best solution to move forward to our common goal, which is the MVP itself. Step 4. Develop your MVP (Coding Time) Since you researched, deliberated, and made many hard decisions, it’s finally time to translate theory into practice! You assemble a team to do the . UX, UI, Code, DevOps, and Tests Keep in mind that an MVP is a product that is born based on . And that process requires experience. You should develop the MVP with speed and precision. It's advisable to have a team of agile software developers who have expertise in specific technologies, implementation, and testing that in the end will save you resources and successfully reach the goal (MVP). PROCESS Step 5. Launch! 🚀 Finally, it’s time to get your product out in the world. That means you allow the early adopters to try your product. You need to pay attention to the feedback from them, as this will be the cornerstone for further development. There are several approaches to go-to-market strategy of an MVP launch. Soft launch The soft launch requires releasing to a limited half of the target audience. The main idea of soft product launching is to reduce risks with product release. It is based on a few key points: Collecting users' opinions helps to improve the usability and user journey. It also allows prioritizing features for the further development. Receive the users’ feedback. Understand the user willingness to pay. Test the monetization options. Hard launch Hard launch is not the best option for launching your MVP. It's applicable to the mature products because the release is with huge marketing activities. The hard launch is a good option if: You have strong infrastructure. You have a large and predictable audience. You can successfully anticipate the market reaction. Dark launch The dark launch is based on the process of continuous delivery. In other words, it’s a regular feature update of your MVP. This approach allows you to track the user behavior in real-time. It’s a perfect way to decide, whether a new update is efficient enough to scale to all users. Because at the end of the day, a successful product is always a result of planning and thorough analysis. So, is it possible to build an MVP in 3 months? 🚀 It sure is! MVP in itself is considered to be a time-efficient solution for a number of reasons, including the focus only on the essential features and the opportunity to initiate the feedback loop early on. In some cases, the development may be restricted to a month or two – from our own experience, however, three months is the optimal timeframe for building your application just enough for your users to get a feel of what it's all about. You might be very excited when coming up with an idea for software that can change people’s lives and make it easier and entertaining. At CodeChem, we also get excited when we get to take part in creating something unique, lovable, friendly, and useful. Let’s combine your ideas with our capabilities and expertise to develop an awesome product. If you’re ready, check out our process and drop us a line.

How to Build a Successful MVP in 3 Months 🚀

On 20th of February 2021 at CodeChem we organized the third Virtual Open Day, which many of us will remember for a long time. It was challenging, fun and exciting. Unfortunately, due to the COVID situation we had to hold the event online. That limited us to display the chemistry that's present in our company. But we still managed to pull it off. The event was attended by more than 150 young people ready to give their best. We rolled up our sleeves, prepared a hundred virtual machines, and created a lot of discord channels. We were motivated and impressed by the number of applicants. Why Open Day is so important to us? Open Day is not just important to us, it's the most important event of the year for CodeChem. During it, we get to meet interesting people, smart students, and folks full of ambition. We get to hang out with them, teach them, but also allow them to teach us too. Everyone has a unique set of qualities. These are the goals of the event: . It's always a pleasure to meet young people who are hungry for knowledge, not afraid of new challenges and who are interested in technology. Right? Meeting smart people . This is one of our core values, but we also like to exercise it outside of the company as well. Teaching is in our DNA. It's what we love to do. Knowledge sharing through problem solving . This is how we started the company, and it has proven itself to be the best way to grow our team. Discovering like-minded people . Open Day is not only for us to find our colleagues and friends. It's an event where both sides are winning. Some candidates continue to work with us with the But those who don't, they leave smarter. Let no one leave empty-handed Boost Internship Program. A sneak peek from Open Day First, we started with a presentation about our company. It was short because there were over 150 candidates. We had to divide them into two batches because the time was limited. Then, the next 3 hours were intended for the workshop. The candidates were divided into software and embedded teams. Each team consisted of two candidates and one mentor. During which the candidates were given a task. The idea behind ​​this concept is to think together and help each other. The mentors helped them achieve that easily. The problem solving process was not easy at all. But it was a good way to show off their skills so we can test their knowledge. The candidates saw it as great challenge but they didn't give up. Kudos to them. Тhe atmosphere in our office Тwo days after the event, we asked the candidates to share their impressions through an anonymous survey. Here's a part of their answers: "It was a truly wonderful experience, something unmatched by any standard teaching or learning. I learned a lot and had a great time." "Fun! The problem I faced was interesting. Working with a mentor was a new experience, as was the whole day. I also liked the approach and structure of CodeChem." "The whole organization was great. My mentor left a very good impression on me. Now I know where I am and where I need to be career wise. It was a great experience." "It was a fun experience. Especially the pair programming part. It was interesting for me to adapt to someone's tempo and mindset. Also finding ways to explain my point of view, and come to a common solution." "Open Day is a great way to relieve the stress of a traditional interview with definitions." "For the first time I participated in this kind of Open Day. But the experience is only with positive feedback. I've had An interesting connection with the employees. I saw the way you should communicate with them. That was a new experience for me. That taught me how you should function in a team or in a given task that you need to perform. Plus, I realized what level my knowledge is and what I need to correct or upgrade. Thank you for the opportunity to attend such an event." "Before the event, I had no experience when it comes to direct contact with an IT company. I was skeptical about working in a team but I was surprised by the good organisation of the CodeChem team. I was in the Software group. The application was quite interesting. I could see where I made mistakes and where I needed help. You inspired me to make Bejeweled in React! Very pleased with the event!" "Virtual Open Day 2021 was a very unique experience for me. The cooperation with the mentor was great. I learned from the open discussions to look at the problem from another perspective. We discussed different implementations and what is a better solution. The relaxed atmosphere made the event fun and interesting." "Great! I like that we worked in a team + mentor. We had great communication and a good problem to solve. I wanted it to last a bit more." "The idea for the event itself was very good and everything was well organized. The mentor was attentive, patient and very dedicated. All in all, it was a nice experience to work in a team and share knowledge and ideas. Thanks to the whole team for the opportunity to attend such an event." "Interesting and unusual. This is my first time attending this type of event. The problem was interesting. Everyone from CodeChem looked very nice and approachable." "The environment was very sociable and my time passed very quickly. The event was engaging and, above all, interesting." "The online event was great. It was well organized and the mentors were available at all times. There was a good atmosphere. The task (at least the one for embedded group) was interesting and challenging." "CodeChem left a great first impression on me. The employees had a friendly relationship with each other. That made me want to be part of such an environment. I hope the mentors are always in the same mood for helping and explaining as they were on the Open Day." "At the beginning it looked like an ordinary IT company. But, as I watched the synergy between the team I realized that this is a very interesting approach. I hope one day I could be part of that team." It was our first experience with a Virtual Open Day. We didn't know what to expect and what outcome we would have. But now, we can proudly say that the Virtual Open Day 2021 brought us a lesson, new friends, and tons of experience. We're looking forward to organizing the next one, but hopefully in real life, like we've always used to do. Previously published at https://blog.codechem.com/we-mentored-over-150-students

Virtual Open Day 2021: Mentoring Over 150 Brilliant Students Virtually

In order to submit an app to the Google Play Store, you need to sign the apk no matter what development framework you're using. In this article, we'll learn how to sign an apk using Cordova. Before starting we will assume that we have previously made all the necessary Cordova installations and added an android platform for our project. Create a keystore file First, we'll need to create the keystore file which is basically a binary file that can hold a set of keys. To create this file you'll need to go to the root of your project and run the command below: keytool -genkey -v -keystore myapp.keystore - myappalias -validity 10000 alias The tag stands for the expiration of the key. After running this command you will see the file at the root of your project. validity myapp.keystore Create a build.json file The file also needs to be created at root level and this is the place where we will store all the parameters needed for signing. The file needs to look something like this: build.json { : { : { : , : , : , : , : }, : { : , : , : , : , : }
    }
} "android" "debug" "keystore" "./myapp.keystore" "storePassword" "pass" "alias" "myappalias" "password" "pass" "keystoreType" "jks" "release" "keystore" "/myapp.keystore" "storePassword" "pass" "alias" "myappalias" "password" "pass" "keystoreType" "jks" Set version and package name Next, we need to do is open the file at root level where we can set the version, version code, and package name in the tag at the top of the file. config.xml widget < = = = = > widget android-versionCode "10" defaultlocale "en-US" id "com.example.myapp" version "1.0" ... is used only for calculations by Google Play and is not visible for users versionCode is the package name of your app id is the version of your app that will be visible on Google Play version Building the app The last thing that we want to do is build the app using the parameters that we defined in . We will achieve that by adding the flag to the build command: build.json --buildConfig cordova build android --release --buildConfig This command will build a signed apk that you can upload to Google Play. The location of the apk will be written as an output of the command, but the correct location should . be platforms/android/app/build/outputs/apk/release For more details on the installation, building, and signing you can go to the official Cordova Android Platform Guide Previously published at https://blog.codechem.com/signing-android-apk-with-apache-cordova

How to Sign Android APKs with Apache Cordova: A Brief Guide

If you’re like me, you've probably woken up on a Monday to find some of your services suddenly failing; perhaps it’s your mobile app failing to connect to your API or your images suddenly failing to load. In my case, some of our mobile apps (Android, specifically) were . After debugging for a bit I found that it was an SSL issue. reporting errors trying to retrieve data from our APIs Opening the URL in question in Chrome or making requests on iOS, however, showed no issues, and I was greeted to the normal green lock icon representing a normal certificate validation. My Issue Modern browsers and HTTP clients, like the iOS one, have better TLS trust verification strategies than older HTTP clients, like cURL and the Android built-in one. They will build a chain of trust to the root instead of stopping and failing at the first expired certificate in the chain. Chrome happily validates the certificate chain, recognizing the newer USERTrust Root Certificate. cURL, however, fails validation saying the certificate has expired. So what’s the problem and how do we debug further? Well to investigate SSL issues we can rely on good old OpenSSL. You can use OpenSSL to fetch all certificate data for a given server by running: # Hostname without protocol (no http/s)
openssl s_client -connect <hostname>: < > port The output you will receive should contain a section containing the full list of certificates in the chain: Certificate chain s: ### No is your own certificate, followed by all intermediate and root certificates s: O=AddTrust AB/OU=AddTrust External TTP Network/CN=AddTrust External CA Root
   i: O=AddTrust AB/OU=AddTrust External TTP Network/CN=AddTrust External CA Root s: ST=New Jersey/L=Jersey City/O=The USERTRUST Network/CN=USERTrust RSA Certification Authority
   i: O=AddTrust AB/OU=AddTrust External TTP Network/CN=AddTrust External CA Root s: ST=DE/L=Wilmington/O=Corporation Service Company/CN=Trusted Secure Certificate Authority i: ST=New Jersey/L=Jersey City/O=The USERTRUST Network/CN=USERTrust RSA Certification Authority 0 .0 1 /C=SE/ /C=SE/ 2 /C=US/ /C=SE/ 3 /C=US/ 5 /C=US/ Notice the in the 1st and 2nd positions in the certificate chain. These certificates are now expired and are causing errors in and the Android HTTP client. AddTrust certificate expiration cURL How do we mitigate this? The proper way to mitigate this is on the is to update the SSL configuration of the server or the reverse-proxy if using TLS-termination. server-side You can check your certificate chain; put the URL of your site into and it will spit out useful information about your certificate chain issues. You can even put in your (domain) and it will auto-remove the expired AddTrust certificates and produce a fixed .crt file you can put into your existing configuration as a drop-in replacement. https://whatsmychaincert.com hostname or you’re having issues with another platform and just want to fix your client until the server admin picks up the slack, you have a few options: If you’re not a server administrator On Linux-based client environments (Ubuntu and others), you can edit the file: ca-certificates.conf /etc/ca-certificates.conf There you will find 2 references to ; a quick fix is to just prepend! Before each line, run update-ca-certificates to apply the changes afterward. AddTrust On , a simple way to fix this for me was to edit /etc/ssl/cert.pem, find the certificate, and completely remove it. macOS AddTrust Make sure you only delete lines between and including: ### AddTrust AB
-----END CERTIFICATE----- This should fix your issues; the cURL and other HTTP clients should now be happy to resolve the new properly. USERTrust Root Certificate Hope you found this helpful and I saved you some headache, cheers! Previously published at https://blog.codechem.com/fixing-the-addtrust-external-ca-root-expiration

Fixing Root Certificate Expiration Errors in cURL

If you have ever developed an iOS app, or even started learning about it, then you must have been a bit (or a lot) confused about the process of app provisioning. I know for sure I was. So that’s why I decided to write this article explaining what in fact are these certificates and profiles, why we need them and a step by step tutorial of how to create and use them. And hopefully it will help some lost fellow out there who’s trying to find a point to this mystic process. So let’s dive into this! 👩‍💻 What are Apple certificates and provisioning profiles and why do we need them? The certificate is a digital identification you use to sign your iOS apps for development and distribution. The main part of the certificate is your public/private key pair, which is a guarantee that the apps are truly developed/distributed by you. You've probably realized by now that you can't install any app on an iOS device. It needs to be signed by Apple first and that's why we need the provisioning profiles. You can see them as a link between the device and the developer account. And if you’re wondering why is Apple requiring all of this? Well, because they are really focused towards providing secure devices. That's why their developers need to be registered, sign their apps and have them reviewed by Apple before any distribution. This is the process they came up with as a way to keep the security on a high level but still be accessible. Creating and using the certificates and provisioning profiles In order to create or use an existing certificate or provisioning profile login to your Apple developer account and you should see the homepage for your Apple developer program account. Navigate to Certificates, Identifiers & Profiles. Note: every certificate and provisioning profile have an expiration date, so it’s really important to check it before using any. Creating a certificate: In the certificates section you’ll see all of the current certificates that are made under that developer program. There are two types of certificates: and . Development Distribution The development one is used when you want to install the app using XCode (when developing an app), and the distribution one is used for distribution of the application (TestFlight/AppStore). If you want to use a current certificate then you can select it and download it, but you would also need to obtain the private key from the developer who created the certificate. 📎 Steps for creating a new certificate: select the plus icon and choose the type of certificate you need (distribution/development) and the type of service - if you have any click continue and you will be navigated to a page where you need to generate a Certificate Signing Request (CSR) file from your Mac. To create a CSR you need to follow these steps: Launch Keychain Access located in /Applications/Utilities. Choose Keychain Access > Certificate Assistant > Request a Certificate from a Certificate Authority. In the Certificate Assistant dialog, enter an email address in the User Email Address field. In the Common Name field, enter a name for the key (for example, Gita Kumar Dev Key). Leave the CA Email Address field empty. Choose “Saved to disk”, and click Continue. This example was taken from the official Apple guide You can now save the request and add it to the request field. After this the certificate is created and you can download it. . Find the downloaded certificate, double click on it and it should now appear in your Keychain The last step depends on whether the certificate is a distribution or development one. - you need to add it to your Keychain and in the Debug configuration of your project in the development environment that you use. Development certificate - you also need to add it in your project but under Release configuration (iOS bundle signing -> signing identity). Additionally, you will need to add the installation of the certificate as a task in your build pipeline (ex. Azure DevOps) before building the project. To do this, first you need to export the certificate from Keychain. Find the certificate in Keychain, right click on it and select export. It will require you to set a password for it, be sure to keep it somewhere because you’ll need it! Next, add the exported certificate with a .p12 format in the repo of the project and add it in the pipeline as well. Next, enter the password and the certificate signing identity (same as the name of the certificate in keychain). One last step is to go in the Build project task in the pipeline and add the same certificate signing identity in the Signing identity field Distribution certificate Creating a provisioning profile: The next thing we need to do if we want to develop or distribute our app is create a Provisioning profile (specific for the certificate that we just created). Each provisioning profile stores the following: certificate, an App ID (two-part string used to identify one or more apps from a single development team) and unique device identifiers (list of devices that the app can run on). Go back to Certificates, Identifiers & Profiles and under Provisioning profiles you will see all of the current profiles that are made under that Apple developer program. There are also two types of provisioning profiles: and . The development one is used for testing of the application, while the distribution one is used when we want to submit our app to AppStore/TestFlight. If you want to use a current profile then you can select it and download it. Distribution Development 📎 Steps for creating a new provisioning profile: select the plus icon and choose the type of profile that you want to create (development/distribution-app store or ad-hoc) next select an App ID - if you plan to use services such as Game Center, In-App Purchase, and Push Notifications, or want a Bundle ID unique to a single app, use an explicit App ID. If you want to create one provisioning profile for multiple apps or don't need a specific Bundle ID, select a Wildcard App ID. Wildcard App IDs use an asterisk (*) as the last digit in the Bundle ID field. in the next step choose what certificate and device/devices is this profile referred to name your profile, generate and download it after it is downloaded find it in your local storage and double click on it to install it in XCode - after successfully installing it you can add it in your project repo and in the project options under iOS Bundle Signing - Provisioning profile in your developing environment The last step here also depends on whether the certificate is a distribution or development one: - you need to select it in your project options under Debug configuration, but be careful, the profile will only appear in the selection list if you have previously selected the certificate that this profile is created for Development profile besides adding it to the project options under Release configuration, you will also need to add the installation of the profile in your build pipeline (ex. Azure DevOps) before or after installing the certificate. To do this, you just need to select the profile from the project repo in the Provisioning profile field. Additionally, under the Build project task in the pipeline you will need to enter the Provisioning profile UUID which can be found in XCode or by right click on the profile and . Distribution profile Get info As mentioned before the certificates and provisioning profiles have their expiration dates. After the expiration date has passed, you will need to create new ones in order to keep working on your app. With all of this set you're ready to go and develop or distribute your iOS app! 📲 Previously published at https://blog.codechem.com/apple-certificates-and-provisioning-profiles-a-mystery-resolved

Developing & Distributing iOS apps: Apple Certificates and Provisioning Profiles

Data persistence plays a big role in almost every application there is. With the introduction of .NET Core and EntityFramework Core a new possibility arose when it comes to data persistence. Now, it is possible to use EntityFramework Core to generate a local storage for our Xamarin Applications. In this article we will explain in a step-by-step tutorial how to set up a Xamarin Forms App with a SQLite local storage, and we are going to use EntityFramework Core to generate a Code-First Database and apply that migration to our app. I assume that you have basic knowledge and have installed the .NET Core SDK, .NET Core tools EntityFramework Core, and all other tools needed to develop a Xamarin Forms app. If not, I suggest you get familiar with them first. I am using Rider as my IDE. Note: Resources: https://docs.microsoft.com/en-us/ef/core/ https://docs.microsoft.com/en-us/ef/core/miscellaneous/cli/dotnet https://docs.microsoft.com/en-us/ef/ef6/modeling/code-first/migrations/ Setting up the project Let us go ahead and create a new Xamarin Forms App. Nothing fancy here, just do the usual project creation from the wizard. My project will be called XamarinEFCore. install and in every project, the traditional and the class library. Next: Microsoft.EntityFrameworkCore Microsoft.EntityFrameworkCore.Sqlite Then, create a new class library which will contain all the class entities we will store in our database. when you select the target framework for the class library, it should be .NET Standard 2.0 and not .NETCore x.x .Also install the here as well. Be careful Microsoft.EntityFrameworkCore You will need it for data annotations. Next, we will create our first entity. It is a pretty basic one just for demo purposes. public {
   [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
   public int Id { get; set; }
   public string RandomGuid { get; set; }
   public DateTime TimeAdded { get; set; }
} class ListItem The data annotation on top of the Id property serves to generate an auto-increment primary key. If you plan to handle unique keys yourself, then you can use the annotation. [Key] Setting up the DatabaseContext The next step is to reference the entities class project in the traditional class library. This is needed so when we setup the context we can define the data sets. Then, we create a folder called that will contain our context class. Our context class will look like this: DatabaseContext public {
    public DbSet<ListItem> Items { get; set; }
    private string DatabaseName = ;

    protected override OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    { databasePath; (Device.RuntimePlatform)
        { Device.iOS:
                databasePath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments), , , DatabaseName); ; Device.Android:
                databasePath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Personal), DatabaseName); ; : NotImplementedException( );
        }
        optionsBuilder.UseSqlite($ );
    }
} : class ApplicationDbContext DbContext const "myItems.db" void String switch case ".." "Library" break case break default throw new "Platform not supported" "Filename={databasePath}" We add a property for each entity that we will store in the database. Because every platform has a different storage location, we set the databasePath accordingly based on the device platform. DbSet< Class > Next, we must do some work in the iOS project to make this work. In the add this line before AppDelegate.cs Xamarin.Forms.Init(); SQLitePCL.Batteries_V2.Init (); On the file add these two lines on top of the namespace: Main.cs [assembly: Preserve( (System.Linq.Queryable), AllMembers = )]
[assembly: Preserve( (System.DateTime), AllMembers = )]
[assembly: Preserve( (System.Linq.Enumerable), AllMembers = )]

[assembly: Preserve( (System.Linq.IQueryable), AllMembers = )] typeof true typeof true typeof true typeof true We need to tell the linker explicitly to include these assemblies, because it has no other way to know that EntityFramework Core needs them. If we don’t, the application will crash while we are migrating the database or if we try to use LINQ queries for data filtering. As a last step, open the file and in the constructor add these two lines: App.xaml.cs db = ApplicationDbContext();

db.Database.Migrate(); var new This applies all the pending migrations to the database, and if it doesn’t exist it creates the database. Creating a migration To create a migration for our app to use we cannot use any of these projects sadly, so we need to create a new project in the same solution. Let us create a console application this time that targets .NETCore so we can create a migration. The next step is to change the default namespace the project has, to match the one of the shared class library. In my example, the namespace will be changed to XamarinEFCore. , and . Then we install: Microsoft.EntityFrameworkCore Microsoft.EntityFrameworkCore.Sqlite Microsoft.EntityFrameworkCore.Design We also need to add a reference to our Entites project. Next, we will recreate the DatabaseContext folder and the ApplicationDbContext class in the MigrationCreator project. The only difference will be in the overridden method. It should look like this. protected override OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
    optionsBuilder.UseSqlite ($ );
} void "Filename={DatabaseName}" You are done! Congratulations Now you only need to create the migration and output it to the traditional shared library of the application. You do that from the command line. You navigate to the MigrationCreator folder which contains your .csproj file and execute the following command dotnet ef migrations add -o <path-to-your-shared-lib> < > MigrationName All set! Happy coding. The full source code for the application sample can be found here. Also published at: https://blog.codechem.com/using-entityframework-core-and-sqlite-with-xamarin-forms

How to Set Up a Xamarin Forms App with SQLite Local Storage

For us, developers, starting a new web project can be a tedious job. It raises questions like: What technology should I use for the front-end? What technology should I use for the back-end? What database is the best? Because nowadays all Javascript technologies like , and are very popular for building Web applications, so we can get an answer for the first question very fast. React Angular Vue But what about the back-end? Should I use or ? Is it better to use a or database? Well, Strapi has the answer to all these questions. NodeJS .NET Core relational non-relational What is Strapi? Strapi is an open-source Headless CMS that gives developers the freedom to choose their favorite tools and frameworks. With all the plugins and features Strapi gives the developers the ability for customization and extensibility. Strapi is also very Developer-Friendly by providing an API that can be easily accessed either via REST or GraphQL endpoint. In this article, we are going to build a simple web application using Strapi and Angular. First, we are going to set up and build our . API Install Strapi Requirements: 12.x and npm 6.x Node.js Create a new project npx create-strapi-app blog_api --quickstart If we want to customize our application to use the specific database we need to run the command without argument. By default, Strapi is using . --quickstart sqlite Once the setup from the command above is finished Strapi will automatically run (NOTE: when manually start the project run the command ) and we can navigate to our admin panel on the following link: . When you navigate you will able to see the registration form. strapi develop http://localhost:1337/admin When we finish with registering our first user, we can start building our API. First, what we need to do for our Blog Application is to define the models that we will have. We will define three models: , , and . Page Post Content To create a new Model navigate to Content Type Builder. Our model will have: Content Title - type Text Value - type RichText IsPublished - type boolean CoverImage - type Media Relation to (Content belong to many ) Post Posts Relation to (Content belong to many ) Page Pages model will have: Page Name - type Text Relation to ( has many ) Content Page Contents Relation to ( has many and belongs to many ) Post Page Posts and model will have: Post IsDeleted - type boolean Relation to ( has many and belongs to many ) Page Post Pages Relation to ( has many ) Contents Post Contents As soon as we define our models we are ready to create some pages, contents, and posts. We can simply do that by navigating to each model and click Add new [name-of-the-model] Now, when we have models and data into our database we need to give access to our visitors of blog application. To do that we need to navigate to tab in the menu. We can see there are by default two types of roles: and . We navigate to role and select: Roles and Permissions Public Authorized Public And that's it. Our API is ready. Now we only need to make our web application. Angular Application For creating our Angular application we will use Angular CLI. Install the Angular CLI with the following command: npm install -g @angular/cli Run the following commands to create and run a new angular app: ng blog-web 
cd blog-web 
ng serve new If you navigate to you will able to see the new app. http://localhost:4200/ Now, we can start with styling our application and access data from our API. First, we will create services and API calls to get our data from Strapi. Navigate to folder and run the following commands: src mkdir services
cd services
ng generate service page
ng generate service post
ng generate service content Angular CLI will create these services so we are ready for coding. In we will put our API URL. environment.ts Navigate to page service and insert the following code: page-service.ts We created two methods: one for getting all pages and one for getting page by id. We will make the same for and services. post content NOTE: Before using we need to register into HttpClient app-module.ts Go to app-module.ts Import the from , HttpClientModule @angular/common/http { HttpClientModule } import from '@angular/common/http' Add it to the array. @NgModule.imports imports:[HttpClientModule,  ...] post-service.ts content-service.ts Next, we will create that will contain style and functionality for posts and we will use for displaying our landing page. Navigate to folder and create a new folder called components. Here, we will store all components that we use in our blog application. With the following command we can generate a new component: post-component app-component app ng generate component post Insert the following code into the post component. post.component.html post.component.scss post.component.ts Because we are using bootstrap classes we need to include bootstrap into our project as well. We can do that by adding the following into index.html <link rel= href= > "stylesheet" "https://stackpath.bootstrapcdn.com/bootswatch/4.3.1/cosmo/bootstrap.min.css" And we are almost done. The only thing that left is to modify and our blog is ready for use. app-component app.component.html app.component.scss app.component.ts Congratulations, we successfully built a Blog application. Conclusion Feel free to continue working on your blog. You can try various scenarios navigation, styling e.t.c. Play with models into Strapi and API calls from your Angular application. The source code of this tutorial is available on . I hope you enjoyed through this adventure. Github Also published on https://blog.codechem.com/the-power-of-strapi-building-web-application-has-never-been-easier

Introduction to Strapi : Headless CMS for Building Web Applications

44,000 startups. 4,553 cities. “4 billion votes” It was such a blessing to get to know so many of your ideas and innovations from every corner of the world in 2021. The startup community amazed all of us with your hard work and persistence despite all of the challenges that we faced globally throughout last year. Not gonna lie, the competition got our hearts racing like Eurovision. We won’t let you wait for much longer, below are long-awaited results! ✨✨✨ To see who is a winner in each respective city, visit and pick a city. The name at the top of the list is the winner. (Compromised awards are under review.) startups.hackernoon.com The will announce the winners per region in their respective cities. Startups Winners Announcement Series 🔥 Central Europe Central Europe has always caught our attention with the talented pool of people in tech community. But were they able to get through 2021 despite the pandemic? Let’s cheers to the most outstanding amongst 4,500+ startups who have been working hard this year: Basel, Switzerland An overwhelming vote for ~ in their mission of helping machinery companies drive more service revenues from their installed base MachiQ Software Berlin, Germany We have with a whooping 538 votes! Let’s support Plan A with its mission to help companies to measure, monitor and reduce their environmental footprint. Plan A Düsseldorf, Germany It doesn’t get any easier with Kicking off in helping people organize online schedules more easily. EasyWeek! Geneva, Switzerland Manage code quality? We have to give props to for their startup! SonarSource Hamburg, Germany Taking over Hamburg is , an acoustic device to reduce noises in vehicle cabins. No more annoying sounds on the road 🚗 ReCalm Köln, Germany Small business? Hoping to manage your marketing campaign? is winning the vote! rankingCoach Lausanne, Switzerland is a Swiss-based company focused on cryptocurrency management solutions built for financial institutions. Metaco Leipzig, Germany empowers companies to operate and utilize drones for the most effective industrial data applications. FlyNex Mainz, Germany is growing sustainable digital mobility startups! Next Mobility Labs Munich, Germany wins for top-line, high-security international Identity Management! ORY Stuttgart, Germany Remote desktop application? Ask anywhere. AnyDesk Vienna, Austria , an IT company enabling privacy-preserving big data applications in the digital age. Mostly AI Zug, Switzerland Way to go 1762 votes for the first provably live pure Proof-of-Stake (PoS) CBC-Casper blockchain designed for real-world applications. CasperLabs! Nyon Calling for robust data solutions for impact-driven organizations! Havuta LLC Zürich is revolutionizing small business lending to give easy access to capital to those who need it most: SMEs ✨ Teylor Heidelberg, Germany is an innovative HR startup providing a solution for fast and efficient recruiting of employees with simple job profiles. Talk'n'Job Stuttgart, Germany Congratulations for winning this title! AnyDesk Moving on to our buddies in... 🔥 Eastern Europe Eastern Europe is home to many familiar big names in our start-up world. Trace history for Miro, Telegram, and Grammarly and you know where they are from. Who is the next generation for Eastern European startups? Budapest, Hungary is a platform for mobile app development, enabling tens of thousands of developers to automate integration, testing, and deployment. Bitrise I__ __ stanbul, Turkey Leading here is - a brand new software intelligence platform- helps organizations deliver faster, high-quality products by connecting their DevOps tools. Oobeya Kraków, Poland is a human cloud platform that connects global enterprises with European software houses, offering tech talent as a service. Talent Alpha Kyiv, Ukraine 281 votes for , an AI powered app where people can swap faces in the videos, GIFs and images in just a few seconds. Reface Sofia, Bulgaria 387 votes for __ __378, leading Blockchain and DLT solutions company that specializes in helping enterprises and blockchain startups design, build and scale innovative solutions using Blockchain & DLT! LimeChain Warsaw, Poland is a next-generation blockchain document management software (DMS). DoxyChain Yerevan, Armenia Whoever clicked to vote for was sure a vote, because it ended up winning as a full-service software provider delivering Artificial Intelligence & Machine Learning solutions for businesses. SmartClick smart Almaty Just like the name suggested, provides one pass to dozens of gyms and studios. 1FIT Debrecen got all the coders ranked figured out! CodersRank Kharkiv is complete solution digital assets management! Pics.io Minsk, Belarus with 243 votes is the first blockchain-powered sports media platform. Scorum Moscow, Russian Federation 1 e-grocery company in Russia with 26 votes and #1 on our HackerNoon board for Minsk. SberMarket Saint Petersburg, Russian Federation leads this area as a personal finance application that rewards responsible spending and savings. CoinKeeper Kazan, Russian Federation Smelling a sweet victory? 3d App designers for flower bouquets is in the house! Flowito Western Europe 🔥 Brexit? Pandemic? It seems like startups in Western Europe still keep their spirits regardless. Startups in Western Europe that stood out in votes this year go to: Antwerp is on a streak! As a bug bounty platform, it ensures online security through a crowd-sourced platform for computer experts. intigriti Belfast A record-breaking 10,003 votes? is an independent coffee shop. Come grab a coffee! Bobs & Berts Birmingham What’s happening in Birmingham? We have , an innovative UK-based advanced lithium battery developer aiming to accelerate the global shift to cleaner. Aceleron Bordeaux 30 is an open-source web framework for building modern apps and websites with Vue.js. NuxtJS Boulogne-billancourt is a software company that provides an in-store analytics platform to optimize operations. DiGEiZ Brighton In for some jam? offers musical education services. BIMM Bristol Another tasty victory for Western Europe is enabling the strongest digital encryption on the internet. KETS Quantum Security Brussels A fashionable win for , a social fashion network. You scan barcodes in fashion shops and see every influencer wearing those outfits! Share your wishlist with your friends and earn cashback. SCANDALOOK Cardiff is a technology company developing end-to-end digital connectivity for the point-of-care diagnostics market. Bond Digital Health London A whooping number of 1085 vote__ __ offers hardware based cyber-security solution for authentication and encryption in a wired local network. Crypto Quantique Edinburgh Hopping up on the crypto movement, just launched last year but they are already rocking it at making crypto accessible to everyone. Zumo Ghent 5379 votes for ! A Belgian InsurTech startup that helps insurance providers all over the world to better connect with their digital customers. WeGroup Glasgow specializes in single-cell analysis transforming the life sciences. Biomage Paris Show some love in the city of love for , a sports platform that is connected to a mobile sports coaching application. AirFit Aberystwyth enables artificial intelligence, data science & digital innovation solutions for the agriculture, biotech & life sciences industries. Agxio Norwich Congratulations for the amazing win of 1124 votes! WATR Charleroi Congratulations for your amazing win! Hirering Gibraltar Give a round of applause to Fortknoxter! Waltham Abbey is ruling the area with its amazing 72 votes! RPAIR Antwerpen Rocking up Antwerpen area is the rising startup ! Willow Egham What’s happening in Egham? Proudly announcing winning the Noonies this year! ATA.ONE Leicester Leicester is calling the name of as the winner for the region! DeadHappy Macclesfield Who else but ? Congratulations on dominating the award! AeroCloud Northern Europe 🔥 Want to listen to some music? Spotify. Need some games to kill time? Candy Crush. What about a quick call to someone you haven’t seen in a long time? Skype. These are all startups that originated from Northern Europe! Noonies, let’s take a look at the upcoming generation of startups from Northern Europe that hopefully will see an even bigger and brighter future. Gothenburg, Sweden Shipping was never made for small shippers, so took on the mission to built an end-to-end logistics platform to empower small businesses to spend less time and money on shipping and more time on growing their businesses. Sendify The Netherlands provides a virtual platform for many kinds of conferences and events. Let's Get Digital Helsinki, Finland A curated collection of public basketball courts in the Helsinki Metropolitan Area called . Everyone is welcome to submit to their local court. Koripallopaikat Lund, Sweden develops an antibiotic-free, safe and effective treatment of vaginal fungal infections. Gedea Biotech Luxembourg, Luxembourg 🚀 is a job-matching platform that connects developers and tech experts with CTOs and team leads from the best tech companies across Europe. 👾 nexten.io Malmö, Sweden Feeling studious, Noonies? __ __e is a tool for Google Classroom, that enables formative matrix assessment towards course learning objectives directly. StudyBe Oslo, Norway is the platform supports a unified API across all connected device categories, removing significant friction for app developers. Domos Labs Reykjavík, Iceland __ __s is a mobile-first technologically advanced neo-bank. Indo service #S__ __ tockholm, Sweden is the biggest blockchain start-up in Sweden. Double winner of the most prestigious nomination in Nordics 'NyTeknik 33-listan', winner of the Deloitte Fast 50, and now Noonies Award! ChromaWay AB T__ __ allinn, Estonia Passing 1000 votes is a fully digital and decentralized ecosystem for all actors in supply chain. OBORTECH Vilnius, Lithuania is an easy-to-use money app for cards and accounts. Via Genome, users can open a business or a merchant account or a personal one with dedicated IBANs, access transfers, exchange currency, process payments, and manage the funds. Genome Aalborg Digura A legaltech offering tenants fast, digital and reliable legal assistance Aarhus Partisia Market Design provides secure, simple, efficient solutions for auctions and exchanges realizing the potential of the market. Helsingborg is a hi-tech company developing cardiac occlusion devices and other vascular implants. Occlutech Tallinna is an AI-powered system for marketing automation in social networks. POSTOPLAN 🔥 Southern Europe Southern Europe’s economy went through a hard time this year due to a huge reduction in tourism. But our startups are of course always headstrong, from Spain to Italy and all the way through Greece. Who are the heroes rising amidst changes of Southern Europe? Skopje is a versatile software development company that solves the business challenges of SMBs, big brands, and brave hearts with awesome ideas. CodeChem Sliema Sounds like just a relaxing exhale. is a holistic health and wellbeing app built to allow users work on the development of their physical, mental and spiritual health Few Tajonar is a company of experienced business & industry entrepreneurs offering solutions to industries based on cutting-edge technologies. das-Nano Tarragona is a technology-based company focusing on the production of integrated microsystems. IMICROQ Terni is an ICT-based integrated solution that is able to modulate, respond, assist and learn to control most home activities. Mind Tirana is a video content and e-commerce platform for the Balkans built on top of an Albanian language specialized search engine. Gjirafa Torino develops and commercializes algorithms based on Artificial Intelligence to increase the autonomy of small satellite missions. AIKO T__ __ orres Buy online groceries like you would buy offline with personalized picking as fast as in 4 hours with Vedras 360hyper! Trento is a music-based platform built around streaming platforms that allow users to discover new emerging artists and make new friends. Brots 2021, what a YEAR. Congratulations to all of the startups that made it to the top winning list for Europe! Stay tuned for Startup awards in 2022 and let’s cheers to a new year of more innovative ideas, bold innovations, and robust creations from you, Europe 🌷 More Information: If you’re a winner, please answer ! If you’re a reader, participant, just a curious individual, consider answering one of our interviews . this interview here Read the FAQs about or . Startups here here To see all of the winners you may visit , pick any city and view the name that appears at the top. this site If you’re interested in partnering with us, we invite you to look through some of these or reach out to our business department. unique sponsorship options Perhaps creating your very own tickles your fancy or maybe you have a whole new idea for how we can partner! writing contest Thank you to all of our sponsors! We truly appreciate your contribution to the tech world and thus the future! The Startups Awards are sponsored by: , , , , , , , , , , Blockster Brex FreeCodeCamp LaunchDarkly Coil Udacity Udemy Vercel Asia Pacific Transgender Network Bybit Everscale Network This post was written by An Le and edited by Natasha Nel. If you have any questions or concerns or would like to report a discrepancy please email ellen@hackernoon.com.

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