In this post, I’ll explain a trick that will give your web application the ability to show friends’ posts. Notes: In this example, we assume these are implemented in your application: User and Post models implemented. A mutual friendship feature has created. If you need to learn how to install this feature you can check for this . post The Idea of friends’ posts is very simple. All that you need is to find the right between User model and Post Model. association So if you think about this association, it looks very simple and natural: A user has many friends. A friend has many posts, so the user’s friends’ posts are the collection of all the friends’ posts. But the question is, how to put in place this association with Ruby on Rails real example? This is our User model: has_many , has_many , has_many , , ... < ApplicationRecord class User :posts dependent: :destroy :friendships dependent: :destroy :friends through: :friendships dependent: :destroy end So, if you learn this Ruby on Rail snippet of code, you will understand that : A user could have a lot of posts. A user has a lot of friends. A friend which is also a user, has a lot of posts. So from these associations, we can create our association with Ruby On Rails like this: ... has_many , , ... < ApplicationRecord class User :friends_posts through: :friends source: :posts end You can understand and methods on this . through: source: OSF post In console : If we have a instance, we could show user friends posts like this: . user1 user1.friends_posts Finally, this is a link to learn more about Ruby on Rails Associations: https://guides.rubyonrails.org/association_basics.html Project: Rails association for better understanding: https://www.theodinproject.com/courses/ruby-on-rails/lessons/associations#project-2-private-events Enjoy coding on Rails!! :)
