rails g migration new table code example

Example 1: how create migration rails

rails g migration AddPartNumberToProducts

Example 2: rails g migration add columns

$ rails generate migration AddDetailsToProducts part_number:string price:decimal

Example 3: activerecord add column

class AddPartNumberToProducts < ActiveRecord::Migration[6.0]
  def change
    add_column :products, :part_number, :string
  end
end