Refactor and clean up.

Author: WaVEV

django_mongodb/fields/__init__.py

@@ -1,4 +1,9 @@
 from .auto import MongoAutoField
-from .json import register_fields
+from .json import register_json_field
+
+
+def register_fields():
+    register_json_field()
+
 
 __all__ = ["MongoAutoField", "register_fields"]

django_mongodb/fields/json.py

@@ -147,7 +147,7 @@ def key_transform_numeric_lookup_mixin(self, compiler, connection):
     return {"$and": [expr, type_in]}
 
 
-def register_fields():
+def register_json_field():
     ContainedBy.as_mql = contained_by
     DataContains.as_mql = data_contains
     HasAnyKeys.mongo_operator = "$or"