#31 API Improvement

* adds support for returning all shared data
* adds documentation

api/utils/serializer/serializer.py

@@ -62,7 +62,12 @@ class AbstractModelAPISerializer:
         Returns:
 
         """
-        self.lookup["id"] = _id
+        if _id is None:
+            # Return all objects
+            del self.lookup["id"]
+        else:
+            # Return certain objects
+            self.lookup["id"] = _id
         self.lookup["users__in"] = [user]
 
     def fetch_and_serialize(self):
@@ -73,8 +78,10 @@ class AbstractModelAPISerializer:
         Returns:
             serialized_data (dict)
         """
-        entry = self.model.objects.get(**self.lookup)
-        serialized_data = self.model_to_geo_json(entry)
+        entries = self.model.objects.filter(**self.lookup)
+        serialized_data = {}
+        for entry in entries:
+            serialized_data[str(entry.id)] = self.model_to_geo_json(entry)
         return serialized_data
 
     @abstractmethod