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Type:
Bug
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Resolution: Unresolved
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Priority:
Unknown
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None
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Affects Version/s: None
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Component/s: None
When you have multiple embedded documents and you try to destroy one of them, Mongoid destroys all documents with the same _id as the deleted document, assuming that _id is unique. If all the _ids are nil, then all of the documents get deleted. Additionally, documents are compared by their _ids, so if all of _ids are nil, the first document is always selected for deletion locally:
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class User include Mongoid::Document include Mongoid::Timestamps embeds_many :accounts end class Account include Mongoid::Document embedded_in :user end u = User.create! u.accounts << Account.new(_id: nil) u.accounts << Account.new(_id: nil) u.accounts[1].destroy p u.accounts.length # => 1 (correct) p u.accounts.first.num # => 2 (expected 1) p u.reload.accounts.size # => 0 (expecting 1)