[Feature] Async Prediction Status Poll (#93)

Fixed #81

Co-authored-by: Tim Lorsbach <tim@lorsba.ch>
Reviewed-on: enviPath/enviPy#93

epdb/models.py

@@ -1358,14 +1358,17 @@ class Pathway(EnviPathModel, AliasMixin, ScenarioMixin):
         return self.kv.get('mode', 'build') == 'predicted'
 
     # Status
+    def status(self):
+        return self.kv.get('status', 'completed')
+
     def completed(self):
-        return self.kv.get('status', 'completed') == 'completed'
+        return self.status() == 'completed'
 
     def running(self):
-        return self.kv.get('status', 'completed') == 'running'
+        return self.status() == 'running'
 
     def failed(self):
-        return self.kv.get('status', 'completed') == 'failed'
+        return self.status() == 'failed'
 
     def d3_json(self):
         # Ideally it would be something like this but
@@ -1472,7 +1475,8 @@ class Pathway(EnviPathModel, AliasMixin, ScenarioMixin):
             "upToDate": True,
             "links": adjusted_links,
             "nodes": nodes,
-            "modified": self.modified.strftime('%Y-%m-%d %H:%M:%S')
+            "modified": self.modified.strftime('%Y-%m-%d %H:%M:%S'),
+            "status": self.status(),
         }
 
         return json.dumps(res)