has_one referencing undefined class passes validation when validating a new model instance

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      The behavior between a has_one and has_many association differs if an association class is missing (i.e. if `Widget` is not defined):

      Has One:

      class User
  include Mongoid::Document
  has_one :widget
end

      User.new.valid? # true

      Has Many:

      class User
  include Mongoid::Document
  has_many :widgets
end

      User.new.valid? # raises NameError (uninitialized constant Widget)

      This only impacts new records. For example:

      User.create
User.last.valid? # correctly raises an exception

              Assignee:
              Unassigned
              Reporter:
              Kevin Sylvestre
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                Created:
                Updated: