[1.11.x] Fixed #25192 -- Fixed squashmigrations crash with RunPython.noop on Python 2.

Thanks Adam Johnson for review.

1 files changed, 9 insertions, 0 deletions

diff --git a/django/db/migrations/operations/special.py b/django/db/migrations/operations/special.py
index 66c5a3af27..9ca0b07b0b 100644
--- a/django/db/migrations/operations/special.py
+++ b/django/db/migrations/operations/special.py
@@ -1,6 +1,7 @@
 from __future__ import unicode_literals
 
 from django.db import router
+from django.utils import six
 
 from .base import Operation
 
@@ -203,3 +204,11 @@ class RunPython(Operation):
     @staticmethod
     def noop(apps, schema_editor):
         return None
+
+
+# Allow migrations using RunPython.noop to be squashed on Python 2 (it doesn't
+# support serializating unbound method so install a module function instead).
+if six.PY2:
+    def noop(apps, schema_editor):
+        return None
+    RunPython.noop = staticmethod(noop)