ruby-on-rails-3 - Rails 3 ActiveRecord 迁移 - ActiveRecord::StatementInvalid

Question

我收到一个奇怪的错误：

ActiveRecord::StatementInvalid in AdminController#edit_user
NoMethodError: undefined method `empty?' for 663:Fixnum: SELECT privileges.*, ...

In: app/controllers/admin_controller.rb:75:in `edit_user'

这是有问题的行：

#line #75 from admin_controller.rb
@privileges = Privilege.find_by_sql( "SELECT privileges.*, vendors.name AS vendor_name FROM privileges LEFT JOIN vendors ON vendors.id = rivileges.vendor_id WHERE user_id = ?  ORDER BY vendors.name", @user.id)

我可以通过取出占位符来修复它，但我不想这样做：

@privileges = Privilege.find_by_sql( "SELECT privileges.*, vendors.name AS vendor_name FROM privileges LEFT JOIN vendors ON vendors.id = privileges.vendor_id WHERE b2b_user_id = "+@user.id.to_s+"  ORDER BY vendors.name")

在 Rails 3 中并没有弃用 find_by_sql，我可以很好地将该查询泵入数据库。

对我来说奇怪的是没有调用“空”？在我的管理员控制器中。这是 Rails 对 empty 的内部调用吗？

请指教。

谢谢

Answer 1

这种语法在 Rails 3.1 中已被弃用。

你应该打电话

@privileges = Privilege.find_by_sql ["SELECT privileges.*, vendors.name AS vendor_name FROM privileges LEFT JOIN vendors ON vendors.id = rivileges.vendor_id WHERE user_id = ?  ORDER BY vendors.name", @user.id]