Question

我正在尝试将product模型与具有倍数条件的transaction模型相关联。 transaction模型包含product_id，user_id，borrowing_date和return_date。

我想指定他们previous_transactions和next_transactions之间的两种关系：

previous_transactions由borrowing_date和return_date定义为零。
next_transactions由borrowing_date和return_date定义为零。

我尝试了以下代码，但它不起作用：

class Product
    .
    .
    .
  has_many :transactions
  has_many :previous_transactions, -> { where return_date: !nil, borrowing_date: !nil },

class_name：'交易' has_many：next_transactions， - ＆gt; {where borrowing_date：nil，return_date：nil}，class_name：'Transaction' 。。。端

这是我的测试：

describe Product do
  let(:owner) { FactoryGirl.create(:user) }
  before { @product = owner.owned_products.new(name: "Marteau") }

  subject { @product }

  describe "previous_transactions" do
    let(:user) { FactoryGirl.create(:user) }
    before { Transaction.create(product: @product, seeker: user, borrowing_date: 1.day.ago, return_date: 1.hour.ago) }

    its(:previous_borrowers) { should include(user) }
  end
end

这里出现错误信息：

1) Product previous_transactions previous_borrowers 
   Failure/Error: its(:previous_borrowers) { should include(user) }
   expected #<ActiveRecord::Associations::CollectionProxy []> to include #<User id: 32, name: "Robot 12", email: "numero12@robots.com", password_digest: "$2a$04$hM7vB0LEpKiIXVVjrOLEEOPMLP5MXzkphP7WKrakvP1a...", remember_token: "czFAoOHWBhHRT6OyvohrUw", admin: false, created_at: "2013-06-12 12:24:56", updated_at: "2013-06-12 12:24:56">
   Diff:
   @@ -1,2 +1,2 @@
   -[#<User id: 32, name: "Robot 12", email: "numero12@robots.com", password_digest: "$2a$04$hM7vB0LEpKiIXVVjrOLEEOPMLP5MXzkphP7WKrakvP1a...", remember_token: "czFAoOHWBhHRT6OyvohrUw", admin: false, created_at: "2013-06-12 12:24:56", updated_at: "2013-06-12 12:24:56">]

我想我必须改变{ where return_date: !nil, borrowing_date: !nil }，但我找不到。我尝试了以下方法，但它也不起作用：

{ where :return_date =! nil && :borrowing_date =! nil }
{ where :return_date.present? && :borrowing_date.present? }
{ where return_date: true, borrowing_date: true } # Because if nil? is false, something not nil must be true ?

有人告诉我there使用像return_date IS NOT NULL这样的SQL语法，但这依赖于数据库。所以我想找点别的......

你可以帮帮我吗？

与多重条件的关联，特别是“不是零”

0 个答案: