Merge pull request #2676 from alphagov/add-returned-letters-table

Add returned letters table

app/dao/returned_letters_dao.py

@@ -0,0 +1,56 @@
+from datetime import datetime
+
+from sqlalchemy import func, desc
+from sqlalchemy.dialects.postgresql import insert
+
+from app import db
+from app.dao.dao_utils import transactional
+from app.models import Notification, NotificationHistory, ReturnedLetter
+
+
+def _get_notification_ids_for_references(references):
+    notification_ids = db.session.query(Notification.id, Notification.service_id).filter(
+        Notification.reference.in_(references)
+    ).all()
+
+    notification_history_ids = db.session.query(NotificationHistory.id, NotificationHistory.service_id).filter(
+        NotificationHistory.reference.in_(references)
+    ).all()
+
+    return notification_ids + notification_history_ids
+
+
+@transactional
+def insert_or_update_returned_letters(references):
+    data = _get_notification_ids_for_references(references)
+    for row in data:
+        table = ReturnedLetter.__table__
+
+        stmt = insert(table).values(
+            reported_at=datetime.utcnow().date(),
+            service_id=row.service_id,
+            notification_id=row.id,
+            created_at=datetime.utcnow()
+        )
+
+        stmt = stmt.on_conflict_do_update(
+            index_elements=[table.c.notification_id],
+            set_={
+                'reported_at': datetime.utcnow().date(),
+                'updated_at': datetime.utcnow()
+            }
+        )
+        db.session.connection().execute(stmt)
+
+
+def get_returned_letter_summary(service_id):
+    return db.session.query(
+        func.count(ReturnedLetter.notification_id).label('returned_letter_count'),
+        ReturnedLetter.reported_at
+    ).filter(
+        ReturnedLetter.service_id == service_id,
+    ).group_by(
+        ReturnedLetter.reported_at
+    ).order_by(
+        desc(ReturnedLetter.reported_at)
+    ).all()