ruby on rails migration index code example

Example 1: change column rails example

def change
    change_column(:table_name, :column_name, :new_type)
end

Example 2: rails g migration add columns

$ rails generate migration AddDetailsToProducts part_number:string price:decimal

Example 3: how do I add index's to a migration in rails

rails generate migration AddUser_idColumnToTable user_id:string. 

class AddIndexToTable < ActiveRecord::Migration
  def change
    add_index :table, :user_id
  end
end

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