Allow args and kwargs to be passed through to_json (#420)

docs/changelog.rst

@@ -2,6 +2,10 @@
 Changelog
 =========
 
+Changes in 0.8.4
+================
+- Allow args and kwargs to be passed through to_json (#420)
+
 Changes in 0.8.3
 ================
 - Fixed EmbeddedDocuments with `id` also storing `_id` (#402)

mongoengine/base/document.py

@@ -321,9 +321,9 @@ class BaseDocument(object):
             message = "ValidationError (%s:%s) " % (self._class_name, pk)
             raise ValidationError(message, errors=errors)
 
-    def to_json(self):
+    def to_json(self, *args, **kwargs):
         """Converts a document to JSON"""
-        return json_util.dumps(self.to_mongo())
+        return json_util.dumps(self.to_mongo(),  *args, **kwargs)
 
     @classmethod
     def from_json(cls, json_data):

mongoengine/queryset/base.py

@@ -827,9 +827,9 @@ class BaseQuerySet(object):
 
     # JSON Helpers
 
-    def to_json(self):
+    def to_json(self, *args, **kwargs):
         """Converts a queryset to JSON"""
-        return json_util.dumps(self.as_pymongo())
+        return json_util.dumps(self.as_pymongo(), *args, **kwargs)
 
     def from_json(self, json_data):
         """Converts json data to unsaved objects"""