#118 API pagination

* adds pagination and related parameters to GET apis
* updates api GET test

api/utils/serializer/serializer.py

@@ -10,6 +10,7 @@ from abc import abstractmethod
 
 from django.contrib.gis import geos
 from django.contrib.gis.geos import GEOSGeometry
+from django.core.paginator import Paginator
 
 from konova.utils.message_templates import DATA_UNSHARED
 
@@ -19,6 +20,10 @@ class AbstractModelAPISerializer:
     lookup = None
     properties_data = None
 
+    rpp = None
+    page_number = None
+    paginator = None
+
     class Meta:
         abstract = True
 
@@ -80,9 +85,12 @@ class AbstractModelAPISerializer:
         Returns:
             serialized_data (dict)
         """
-        entries = self.model.objects.filter(**self.lookup)
+        entries = self.model.objects.filter(**self.lookup).order_by("id")
+        self.paginator = Paginator(entries, self.rpp)
+        requested_entries = self.paginator.page(self.page_number)
+
         serialized_data = {}
-        for entry in entries:
+        for entry in requested_entries.object_list:
             serialized_data[str(entry.id)] = self._model_to_geo_json(entry)
         return serialized_data