Wrap a model around list of all organisations

app/models/__init__.py

@@ -1,3 +1,6 @@
+from abc import ABC, abstractmethod
+from collections.abc import Sequence
+
 from flask import abort
 
 
@@ -33,5 +36,30 @@ class JSONModel():
             abort(404)
 
 
+class ModelList(ABC, Sequence):
+
+    @property
+    @abstractmethod
+    def client():
+        pass
+
+    @property
+    @abstractmethod
+    def model():
+        pass
+
+    def __init__(self):
+        self.items = self.client()
+
+    def __getitem__(self, index):
+        return self.model(self.items[index])
+
+    def __len__(self):
+        return len(self.items)
+
+    def __add__(self, other):
+        return list(self) + list(other)
+
+
 class InviteTokenError(Exception):
     pass