Required files
mongoid/relations/accessors
mongoid/relations/auto_save
mongoid/relations/cascading
mongoid/relations/constraint
mongoid/relations/conversions
mongoid/relations/cyclic
mongoid/relations/proxy
mongoid/relations/bindings
mongoid/relations/builders
mongoid/relations/many
mongoid/relations/one
mongoid/relations/options
mongoid/relations/polymorphic
mongoid/relations/targets/enumerable
mongoid/relations/embedded/atomic
mongoid/relations/embedded/in
mongoid/relations/embedded/many
mongoid/relations/embedded/one
mongoid/relations/referenced/batch
mongoid/relations/referenced/in
mongoid/relations/referenced/many
mongoid/relations/referenced/many_to_many
mongoid/relations/referenced/one
mongoid/relations/reflections
mongoid/relations/synchronization
mongoid/relations/metadata
mongoid/relations/macros