Question

I have user model and user model has_one profile model.
Also I have user.phone and user.profile.phone but I want to remove user.phone and I will use only user.profile.phone.

Before I remove the user.phone,I wanna copy user.phone to user.profile.phone if user.phone is not blank.Then I will remove user.phone

For instance:

user.phone = 123
user.profile.phone = 234

After migration:

user.phone will be removed
user.profile.phone = 123 - 234

What is the appropriate migration for this purpose?

Answer 1

try this

class YourMigration < ActiveRecord::Migration
 def self.up
   User.find_each do |user|
 user.profile.update_attributes(:phone => user.phone) unless user.phone.blank?
   end
   remove_column :users, :phone
 end

 def self.down
  add_column :users, :phone, :string
 end
end