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Type:
Task
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Resolution: Done
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Affects Version/s: None
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Component/s: None
When enabling Identity Map, I can use a finder on class C to retrieve documents of type B, see the example below. When turning off Identity Map it works as expected and find returns nil. I'm confused if this is a bug or expected behaviour, because I see the same issue in an app that uses MongoMapper.
Tried Mongoid 3.0.1, 3.0.2, 3.1.0.
Mongoid.identity_map_enabled = true class A include Mongoid::Document field :name end class B < A end class C < A end 3.times { A.create(:name => 'abcde') B.create(:name => 'abcde') C.create(:name => 'abcde') } # => 3 B.all.entries # => [#<B _id: 50150a2d662478c841000002, _type: "B", name: "abcde">, #<B _id: 50150a2d662478c841000005, _type: "B", name: "abcde">, #<B _id: 50150a2d662478c841000008, _type: "B", name: "abcde">] C.find(B.first._id) # => <B _id: 50150a2d662478c841000002, _type: "B", name: "abcde"> C.find('50150a2d662478c841000002') # => <B _id: 50150a2d662478c841000002, _type: "B", name: "abcde"> A.delete_all Mongoid.identity_map_enabled = false 3.times { A.create(:name => 'abcde') B.create(:name => 'abcde') C.create(:name => 'abcde') } # => 3 B.all.entries # => [#<B _id: 50150c17662478c84100000b, _type: "B", name: "abcde">, #<B _id: 50150c17662478c84100000e, _type: "B", name: "abcde">, #<B _id: 50150c17662478c841000011, _type: "B", name: "abcde">] C.find(B.first._id) # => nil