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There are 3 ways to change the database column in Ruby 5: Changing Database Column in Rails 5. You can change the column name and the column type, as well as changing the column with the type conversion. There are three ways to achieve that: Making a new migration, Fixing the existing migration, Changing the Column Type and Renaming the Column Name. Always run your RSpec tests after each change to the database to make it sure everything is working as intended. Always be careful with reserved names in Rails or SQL when renaming a column.