Fixes #169: Replicate the global search table for each branch (#236)

* Fixes #169: Replicate the global search table for each branch

* Cleanup

Author: jeremystretch

netbox_branching/constants.py

@@ -14,6 +14,7 @@
 # must be replicated for each branch to ensure proper functionality
 INCLUDE_MODELS = (
     'dcim.cablepath',
+    'extras.cachedvalue',
 )
 
 # Models for which branching support is explicitly disabled

netbox_branching/models/branches.py

@@ -518,15 +518,15 @@ def provision(self, user):
                     cursor.execute(
                         f"INSERT INTO {schema_table} SELECT * FROM {main_table}"
                     )
-                    # Get the name of the sequence used for object ID allocations
+                    # Get the name of the sequence used for object ID allocations (if one exists)
                     cursor.execute(
                         "SELECT pg_get_serial_sequence(%s, 'id')", [table]
                     )
-                    sequence_name = cursor.fetchone()[0]
                     # Set the default value for the ID column to the sequence associated with the source table
-                    cursor.execute(
-                        f"ALTER TABLE {schema_table} ALTER COLUMN id SET DEFAULT nextval(%s)", [sequence_name]
-                    )
+                    if sequence_name := cursor.fetchone()[0]:
+                        cursor.execute(
+                            f"ALTER TABLE {schema_table} ALTER COLUMN id SET DEFAULT nextval(%s)", [sequence_name]
+                        )
 
                 # Commit the transaction
                 cursor.execute("COMMIT")