Ruby on rails Mongoid关联创建（不需要的）记录

我不明白为什么Mongoid在一个协会创造了一个新记录。我正在仔细阅读代码，但我从未见过这样的事情。我做了一个测试并精简了代码。我把录像机留着以防万一

it "should not create a duplicate entry for MT" do state = PolcoGroup.create(type: :state, name: 'MT', active: true) s = state.get_senators state.junior_senator = s[:state_junior_senator] # !!!!! this creates a new record state.senior_senator = s[:state_senior_senator] # !!!!! so does this line expect(Legislator.all.size).to eql(2) # actually equals 4 -- each association creates a new record end result is: Legislator.all.map(&:sortname) => ["Tester, Jon (Sen.) [D-MT]", "Walsh, John (Sen.) [D-MT]", "Walsh, John (Sen.) [D-MT]", "Tester, Jon (Sen.) [D-MT]"] ## models class PolcoGroup include Mongoid::Document include Mongoid::Timestamps include VotingMethods include DistrictMethods extend DistrictClassMethods include StateMethods field :name, :type => String ... # STATE RELATIONSHIPS ----------------------------- has_one :junior_senator, class_name: "Legislator", inverse_of: :jr_legislator_state has_one :senior_senator, class_name: "Legislator", inverse_of: :sr_legislator_state ... end class Legislator include Mongoid::Document include Mongoid::Timestamps # the following fields are directly from govtrack field :govtrack_id, type: Integer field :bioguideid, type: String ... belongs_to :jr_legislator_state, class_name: "PolcoGroup", inverse_of: :junior_senator belongs_to :sr_legislator_state, class_name: "PolcoGroup", inverse_of: :senior_senator ... end module StateMethods def get_senators ... # just returns the following {state_senior_senator: senators.first, state_junior_senator: senators.last} end end

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您可以在这里看到更多代码：

好的-永远不要做我所做的事情。我把一个旧版本的mongo作为测试数据库，然后进行上述操作。当然，它工作不正常。

在查看代码时，我看到调用了Mongoid:：Relations:：Accessors，并调用了build，其描述为：构建相关文档并创建关系，除非文档为nil，否则在此文档上设置关系。该记录是由：relation=create\u relationobject创建的，metadataSee:我几乎在一年前就遇到了同样的问题：