RSpec -刷新关联

Question

我有一个LabCollection：

class LabCollection < ApplicationRecord
  # Relationships
  belongs_to :lab_container, polymorphic: true, optional: true
  has_many :lab_collection_labs
  has_many :labs, -> { published }, through: :lab_collection_labs
  has_many :lab_collection_inclusions, dependent: :destroy
end

它有许多LabCollectionLabs：

class LabCollectionLab < ApplicationRecord
  acts_as_list scope: :lab_collection_id, add_new_at: :bottom
  belongs_to :lab_collection
  belongs_to :lab
end

它有实验室的身份证，属于实验室。

我有一个规范，它测试如何创建新的关联，并在以下几个方面进行了验证：

context 'when the lab container has labs already present' do
        it 'removes the present labs and adds the new ones' do
          subject = RawLabAdder
          expect(populated_lab_collection.labs).to eq labs
          subject.new(populated_lab_collection, [lab4.id, lab5.id]).perform
          expect(populated_lab_collection.labs).not_to eq labs
          binding.pry
          expect(populated_lab_collection.labs).to eq [lab4, lab5]
        end
      end

如果您需要查看代码的内部工作情况，请让我知道，但是问题似乎与RSpec和刷新关联有关。当我到达binding.pry点并调用populated_lab_collection.lab_collection_labs时

populated_lab_collection.lab_collection_labs
=>
[lab_collection_lab_4, lab_collection_lab_5]

但是，当我调用.labs时：

populated_lab_collection.labs
=>
[]

通过检查lab_collection_labs，我可以看到它们每个都有一个lab_id，并且存在一个用于这些ID的实验室。我相信我的问题是，我没有正确地刷新记录，但是我尝试过：

      # populated_lab_collection.reload
      # populated_lab_collection.lab_collection_labs.reload
      # populated_lab_collection.lab_collection_labs.each do |x|
      #   x.lab.reload
      # end
      # populated_lab_collection.labs.reload

任何关于如何让RSpec正确读取记录嵌套关联的建议都是非常感谢的。正如我在检查记录时所说的，它有两个lab_inclusion_labs，每个lab_inclusion_labs都有一个实验室，但是父记录显然没有实验室。

编辑: RawLabAdder类：

module LabCollections
  class RawLabAdder

    def initialize(incoming_lab_collection, lab_ids = [])
      @lab_ids = lab_ids
      @lab_collection = incoming_lab_collection
    end

    def perform
      remove_associated_labs
      add_labs
    end

    private

    def add_labs
      @lab_ids.each do |x|
        lab = Lab.find(x)
        LabCollectionInclusionAdder.new(@lab_collection, lab).perform
      end
    end

    def remove_associated_labs
      @lab_collection.lab_collection_inclusions.map(&:destroy)
      @lab_collection.lab_collection_labs.map(&:destroy)
    end
  end
end

Answer 1

如果在预挂钩或规范中创建一个实例，然后对其执行一些与数据库相关的工作，那么您拥有的实例将不再引用最新的信息。

在断言之前尝试重新加载populated_lab_collection。

expect(populated_lab_collection.reload.labs).not_to eq labs