Has_one，属于迁移

Question

I'm having a little bit of trouble truly understanding how this concept would work. First I'm going to use the devise gem for user authentication and activation, but I need to know how my migrations should look. I have a unique key (user will be given) that will be used to activate an account.

So here's what my code looks like VERY early on, mind you:

User Model

class User < ActiveRecord::Base
  has_one :safe
  has_many :contacts
end

Safe Model

class Safe < ActiveRecord::Base
  belongs_to :user
end

CreateSafes Migration file

class CreateSafes < ActiveRecord::Migration
  def change
    create_table :saves do |t|
      t.string :safe_key

      t.timestamps
    end
  end
end

CreateUsers Migration

class CreateUsers < ActiveRecord::Migration
  def change
    create_table :users do |t|
      t.string :email
      t.string :password

      t.timestamps
    end
  end
end

I'm really just not sure if I add a user_id value to the safe migration table, or whether I just use the safe_key, since that's going to be a totally unique value. Any help and wisdom would be appreciated. Thanks.

Answer 1

Yes, manually add user_id to the safe table. In associations, rails stores foreign keys in the table with the :belongs_to Then you could use safe.user to get the user, or user.safe to get the safe.