Mongoid v4.0.1 Release Notes
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Resolved Issues
#3911 Fix relations named "parent". (nkriege)
#3792/#3881 Fix many internal calls to #_id instead of #id to avoid issues when overloading #id (Gauthier Delacroix)
#3847 Fix 'QueryCache#get_more' result, when collection has more documents than first query batch. (Angelica Korsun)
#3684 Dont raise MissingAttributeError, when using a only() scope. (Arthur Neves)
#3703 pluck method should not compact the values. (Arthur Neves)
#3773 Use nanoseconds for cache_key timestamp instead of plain seconds. (Máximo Mussini)