Add Id column in a migration

Question

I have a Rails app, where one of the models does not have the id column. Doing some research I found the migration that created it:

create_table         


        

Answer 1

You already got your answer, but here is a one liner that does all in this case

rails generate migration AddIdToModel id:integer

Look at the syntax of migration file name AddColumnNameToTableName followed the column description. It will generate something like below

class AddIdToModel < ActiveRecord::Migration
  def change
    add_column :models, :id, :integer
  end
end

Now you can change this line if you feel for anything else. and just run rake db:migrate.