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Rails Generate Migration

we can generate a rails migration file from the terminal using the following command:

rails generate migration NAME [field[:type][:index] field[:type][:index]] [options]

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For a list of all the options supported by the command, we could run the command without any arguments as in rails generate migration.
For example, if we want to add first_name and last_name fields to users table, you can do:

rails generate migration AddNamesToUsers last_name:string first_name:string

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Rails will create the following migration file:

class AddNamesToUsers < ActiveRecord::Migration[5.0]
  def change
    add_column :users, :last_name, :string
    add_column :users, :first_name, :string
  end
end

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Now, apply the pending migrations to the database by running the following in the terminal:

rake db:migrate

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rails db:migrate

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