According to wlanslovenija#38:

Use an additional mixin for get_related_resource
Changed meta property name to prefer_polymorphic_resource_uri

tastypie_mongoengine/fields.py

@@ -23,15 +23,19 @@ def get_api_name(self):
             return self._resource._meta.api_name
         return None
 
+class GetRelatedMixin(object):
     def get_related_resource(self, related_instance):
-        related_resource = super(ApiNameMixin, self).get_related_resource(related_instance)
+        related_resource = super(GetRelatedMixin, self).get_related_resource(related_instance)
         type_map = getattr(related_resource._meta, 'polymorphic', {})
-        if type_map and getattr(related_resource._meta, 'prefer_related_resource_name', False):
+        if type_map and getattr(related_resource._meta, 'prefer_polymorphic_resource_uri', False):
             resource = related_resource._get_resource_from_class(type_map, related_instance.__class__)
             related_resource._meta.resource_name = resource._meta.resource_name
         return related_resource
 
-class BuildRelatedMixin(ApiNameMixin):
+class TastypieMongoengineMixin(ApiNameMixin, GetRelatedMixin):
+    pass
+
+class BuildRelatedMixin(TastypieMongoengineMixin):
     def build_related_resource(self, value, **kwargs):
         # A version of build_related_resource which allows only dictionary-like data
         if hasattr(value, 'items'):
@@ -46,7 +50,7 @@ def build_related_resource(self, value, **kwargs):
         else:
             raise exceptions.ApiFieldError("The '%s' field was not given a dictionary-alike data: %s." % (self.instance_name, value))
 
-class ReferenceField(ApiNameMixin, fields.ToOneField):
+class ReferenceField(TastypieMongoengineMixin, fields.ToOneField):
     """
     References another MongoEngine document.
     """
@@ -212,7 +216,7 @@ def to_class(self):
         return self._to_class_with_listresource
 
 
-class ReferencedListField(ApiNameMixin, fields.ToManyField):
+class ReferencedListField(TastypieMongoengineMixin, fields.ToManyField):
     """
     Represents a list of referenced objects. It must be used in conjunction
     with ReferenceField.

tastypie_mongoengine/resources.py

@@ -310,7 +310,7 @@ def _wrap_polymorphic(self, resource, fun):
             self._meta.queryset = resource._meta.queryset
             self.base_fields = resource.base_fields.copy()
             self.fields = resource.fields.copy()
-            if getattr(self._meta, 'prefer_related_resource_name', False):
+            if getattr(self._meta, 'prefer_polymorphic_resource_uri', False):
                 self._meta.resource_name = resource._meta.resource_name
             if getattr(self._meta, 'include_resource_type', True):
                 self.base_fields['resource_type'] = base_fields['resource_type']

tests/test_project/test_app/api/resources.py

@@ -84,7 +84,7 @@ class Meta:
         allowed_methods = ('get', 'post', 'put', 'patch', 'delete')
         authorization = tastypie_authorization.Authorization()
 
-        prefer_related_resource_name = True
+        prefer_polymorphic_resource_uri = True
         polymorphic = {
             'individual': IndividualResource,
             'company': CompanyResource,