rails add index code example

Example 1: 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

Example 2: rails add index from console

ActiveRecord::Migration.add_column :table_name, :field_name, :field_type

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Ruby Example

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