Question

我有两个带有以下关联的模型

class Application < ActiveRecord::Base
  belongs_to :registration
end

class Registration < ActiveRecord::Base
  has_many :applications, :dependent => :destroy
end

现在我正在尝试进行如下所示的查询

@applications = Application.includes(:registration).where("registration.stdniveau = ? AND uni_id = ? AND offer_sent = ? AND (offer_accepted =? OR offer_accepted =?)", 2, @uni.id, 1, nil, 1).references(:registration)

我也试过这个

@applications = Application.includes(:registrations).where("registrations.stdniveau = ? AND uni_id = ? AND offer_sent = ? AND (offer_accepted =? OR offer_accepted =?)", 2, @uni.id, 1, nil, 1).references(:registrations)

但是这两个查询都给我带来了难以理解的错误。我不明白我在这里错过了什么？

Answer 1

1）您应该使您的belongs_to单数：注册

2）如果你想根据另一个表进行条件选择，你需要加入它。

3）所以这应该有效：

Application.joins(:registration)
.where("registrations.stdniveau = ? AND uni_id = ? AND offer_sent = ? AND (offer_accepted =? OR offer_accepted =?)", 2, @uni.id, 1, nil, 1")

Rails查询包含has_many并属于关联

1 个答案: