proxy.rb in mongoid-8.1.0

- old
+ new

@@ -28,19 +28,20 @@
           # in the association.
           #
           # @example Substitute the new document.
           #   person.name.substitute(new_name)
           #
-          # @param [ Document ] replacement A document to replace the target.
+          # @param [ Document | Hash ] replacement A document to replace the target.
           #
           # @return [ Document | nil ] The association or nil.
           def substitute(replacement)
             unbind_one
             unless replacement
               _base.delete if persistable?
               return nil
             end
             _base.new_record = true
+            replacement = Factory.build(klass, replacement) if replacement.is_a?(::Hash)
             self._target = replacement
             bind_one
             self
           end
 