What are Ruby on Rails migrations and how do they work?
Ruby on Rails migrations are a way to alter your database schema over time in a consistent and easy way. They allow you to create, modify, and delete database tables and columns.
Can you give me an example of a migration?
Sure! A simple migration to create a 'users' table might look like this: create_table :users do |t| t.string :name t.string :email t.timestamps end
.
How do I roll back a migration?
You can roll back a migration using the command rails db:rollback
. This will undo the last migration that was run.
What if I want to change a column type?
You can change a column type using the change_column
method in a migration, like this: change_column :users, :age, :integer
.
Are there any best practices for writing migrations?
Yes, it's best to keep migrations small and focused, use descriptive names, and always test them in a development environment before running in production.
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