How do I use migrations and seeding in Rails?

How do I use migrations and seeding in Rails?

In Rails, migrations are used to modify the database schema, while seeding populates the database with initial data.

Can you give me an example of a migration?

Sure! A simple migration to create a 'users' table would look like this:

class CreateUsers < ActiveRecord::Migration[6.0]
  def change
    create_table :users do |t|
      t.string :name
      t.string :email
      t.timestamps
    end
  end
end

What about seeding? How do I seed the database?

You can seed the database by adding data to the db/seeds.rb file. For example:

User.create(name: 'John Doe', email: '[email protected]')
``` Then run `rails db:seed` to execute it.

How can 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.