add raw query

ereuse_devicehub/inventory/views.py

@@ -118,19 +118,33 @@ class ErasureListView(DeviceListMixin):
     def dispatch_request(self, orphans=0):
         self.get_context()
         self.get_devices(orphans)
-        if orphans:
-            self.context['orphans'] = True
         return flask.render_template(self.template_name, **self.context)
 
     def get_devices(self, orphans):
+        page = int(request.args.get('page', 1))
+        per_page = int(request.args.get('per_page', 5))
+
         erasure = EraseBasic.query.filter_by(author=g.user).order_by(
             EraseBasic.created.desc()
         )
         if orphans:
-            erasure = [e for e in erasure if e.device.orphan]
-
-        page = int(request.args.get('page', 1))
-        per_page = int(request.args.get('per_page', 5))
+            schema = app.config.get('SCHEMA')
+            sql = f"""
+                select action.id from {schema}.action as action
+                    inner join {schema}.erase_basic as erase
+                        on action.id=erase.id
+                    inner join {schema}.device as device
+                        on device.id=action.parent_id
+                    inner join {schema}.placeholder as placeholder
+                        on placeholder.binding_id=device.id
+                    where action.parent_id is null or placeholder.kangaroo=true
+            """
+            ids = (e[0] for e in db.session.execute(sql))
+            erasure = EraseBasic.query.filter(EraseBasic.id.in_(ids)).order_by(
+                EraseBasic.created.desc()
+            )
+            self.context['orphans'] = True
+            # import pdb; pdb.set_trace()
 
         erasure = erasure.paginate(page=page, per_page=per_page)
         erasure.first = per_page * erasure.page - per_page + 1