Fix list zones if shared with multiple projects

This patch fixes a bug when listing zones or updating recordsets in
zones that are shared with more than one project.

Closes-Bug: #2025295
(cherry picked from commit 011ebe2e7c)
Change-Id: I98c341b8f7138681e35d84707062f8d0e807c533

designate/storage/impl_sqlalchemy/__init__.py

@@ -223,7 +223,8 @@ class SQLAlchemyStorage(sqlalchemy_base.SQLAlchemy, storage_base.Storage):
                             literal_column('False')),
                            else_=literal_column('True')).label('shared')
         query = select(
-            [tables.zones, shared_case]).outerjoin(tables.shared_zones)
+            [tables.zones,
+             shared_case]).outerjoin(tables.shared_zones).distinct()
 
         zones = self._find(
             context, tables.zones, objects.Zone, objects.ZoneList,

designate/tests/test_storage/__init__.py

@@ -706,6 +706,23 @@ class StorageTestCase(object):
         results = self.storage.find_zones(two_context)
         self.assertEqual(1, len(results))
 
+    def test_find_zones_shared(self):
+        # Create an admin context
+        admin_context = self.get_admin_context()
+
+        # Create a zone in the admin context
+        zone = self.create_zone(context=admin_context)
+
+        # Share the zone with two other projects
+        self.share_zone(
+            zone_id=zone['id'], target_project_id=1, context=admin_context)
+        self.share_zone(
+            zone_id=zone['id'], target_project_id=2, context=admin_context)
+
+        # Ensure that one zone record is returned from find_zones (LP 2025295)
+        results = self.storage.find_zones(admin_context)
+        self.assertEqual(1, len(results))
+
     def test_get_zone(self):
         # Create a zone
         expected = self.create_zone()

releasenotes/notes/Fix-zone-list-when-zone-shared-more-than-once-288b57cafeba82df.yaml

@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    Fixed issues with list zones and recordsets when a zone is shared with more
+    than one project.