Question

I’ve created a one-to-one association between my Admin and Report models and it isn’t working just yet. I’m using Devise to log in via an Admin model so in the controller I’m using the current_admin helper. Silly question, but what migration do I need to run to get this working?

Error

ActiveRecord::StatementInvalid (PGError: ERROR:  column reports.admin_id does not exist
2011-10-14T09:16:57+00:00 app[web.1]: LINE 1: SELECT  "reports".* FROM "reports" WHERE ("reports".admin_id = ...

Report model

belongs_to :admin, :foreign_key => "admin_id"

Admin model

has_one :report, :foreign_key => "admin_id" 

Controller

@report = current_admin.report

Schema

create_table "reports", :force => true do |t|
  t.string   "name"
  t.string   "description"
  t.datetime "created_at"
  t.datetime "updated_at"
  t.string   "user_id"
end

create_table "admins", :force => true do |t|
  t.string   "email",                                 :default => "", :null => false
  t.string   "encrypted_password",     :limit => 128, :default => "", :null => false
  t.string   "reset_password_token"
  t.datetime "reset_password_sent_at"
  t.datetime "remember_created_at"
  t.integer  "sign_in_count",                         :default => 0
  t.datetime "current_sign_in_at"
  t.datetime "last_sign_in_at"
  t.string   "current_sign_in_ip"
  t.string   "last_sign_in_ip"
  t.datetime "created_at"
  t.datetime "updated_at"
end

Answer 1

You need admin_id in reports. You can remove the foreign_key stuff in your models. That’s done automatically. Create a migration, add

add_column :reports, :admin_id, :integer

Run rake db:migrate and you’re done.