Replace generated raw sql: fix error on empty addons list (bug 1197471)

apps/bandwagon/models.py

@@ -564,11 +564,10 @@ def save(self, **kw):
     def set_addons(self, addon_ids):
         # SyncedCollections are only written once so we don't need to deal with
         # updates or deletes.
-        cursor = connection.cursor()
-        values = ['(%s,%s)' % (addon, self.id) for addon in addon_ids]
-        cursor.execute("""
-            INSERT INTO synced_addons_collections (addon_id, collection_id)
-            VALUES %s""" % ','.join(values))
+        relations = [
+            SyncedCollectionAddon(addon_id=addon_id, collection_id=self.pk)
+            for addon_id in addon_ids]
+        SyncedCollectionAddon.objects.bulk_create(relations)
         if not self.addon_index:
             self.addon_index = self.make_index(addon_ids)
             self.save()

apps/bandwagon/tests/test_models.py

@@ -10,7 +10,8 @@
 from access.models import Group
 from addons.models import Addon, AddonRecommendation
 from bandwagon.models import (Collection, CollectionAddon, CollectionUser,
-                              CollectionWatcher, RecommendedCollection)
+                              CollectionWatcher, RecommendedCollection,
+                              SyncedCollection)
 from devhub.models import ActivityLog
 from bandwagon import tasks
 from users.models import UserProfile
@@ -228,3 +229,22 @@ def test_no_dups(self, scores):
         recs = RecommendedCollection.build_recs([7, 3, 8])
         # 3 should not be in the list since we already have it.
         eq_(recs, [1, 2])
+
+
+class TestSyncedCollection(amo.tests.TestCase):
+    fixtures = ['base/addon-recs']
+    ids = (5299, 1843, 2464, 7661, 5369)
+
+    def test_set_addons(self):
+        synced_collection = SyncedCollection.objects.create()
+        synced_collection.set_addons(self.ids)
+        synced_collection.reload()
+        assert tuple(
+            synced_collection.addons.values_list('id', flat=True)) == self.ids
+
+    def test_set_addons_empty_list(self):
+        """This is really to make sure it doesn't blow up: see bug 1197471."""
+        synced_collection = SyncedCollection.objects.create()
+        synced_collection.set_addons([])
+        synced_collection.reload()
+        assert synced_collection.addons.count() == 0