#31 API Improvement

* adds support for returning all shared data
* adds documentation

api/utils/serializer/v1/intervention.py

@@ -90,6 +90,8 @@ class InterventionAPISerializerV1(AbstractModelAPISerializerV1,
         Returns:
             obj
         """
+        if legal_data is None:
+            return obj
         obj.legal.registration_date = legal_data["registration_date"]
         obj.legal.binding_date = legal_data["binding_date"]
         obj.legal.process_type = self.konova_code_from_json(
@@ -110,6 +112,8 @@ class InterventionAPISerializerV1(AbstractModelAPISerializerV1,
         Returns:
             obj
         """
+        if responsibility_data is None:
+            return obj
         obj.responsible.registration_office = self.konova_code_from_json(
             responsibility_data["registration_office"],
             CODELIST_REGISTRATION_OFFICE_ID
@@ -134,6 +138,8 @@ class InterventionAPISerializerV1(AbstractModelAPISerializerV1,
         Returns:
             obj (intervention)
         """
+        if payment_data is None:
+            return obj
         payments = []
         for entry in payment_data:
             due_on = entry["due_on"]
@@ -226,9 +232,9 @@ class InterventionAPISerializerV1(AbstractModelAPISerializerV1,
             properties = json_model["properties"]
             obj.title = properties["title"]
             obj.modified = update_action
-            self.set_responsibility(obj, properties["responsible"])
-            self.set_legal(obj, properties["legal"])
-            self.set_payments(obj, properties["payments"])
+            self.set_responsibility(obj, properties.get("responsible", None))
+            self.set_legal(obj, properties.get("legal", None))
+            self.set_payments(obj, properties.get("payments", None))
             obj.geometry.geom = self.create_geometry_from_json(json_model)
             obj.geometry.modified = update_action