Refs #26064 -- Avoided unnecessary list slicing in migration optimizer.

The in_between list is only necessary if an optimization is possible.
2020-03-02 02:42:06 -05:00 · 2020-03-02 02:42:06 -05:00 · daaa894960
parent a49c2b6bf0
commit daaa894960
1 changed files with 1 additions and 1 deletions
--- a/django/db/migrations/optimizer.py
+++ b/django/db/migrations/optimizer.py
@ -45,9 +45,9 @@ class MigrationOptimizer:
            right = True  # Should we reduce on the right or on the left.
            # Compare it to each operation after it
            for j, other in enumerate(operations[i + 1:]):
-                in_between = operations[i + 1:i + j + 1]
                result = operation.reduce(other, app_label)
                if isinstance(result, list):
+                    in_between = operations[i + 1:i + j + 1]
                    if right:
                        new_operations.extend(in_between)
                        new_operations.extend(result)