[5.2.x] Fixed #36061 -- Added migration support for ManyToManyField.through_fields.

Added through_fields support to ManyToManyField.deconstruct.
Thanks to Simon Charette for pointers and the review.

Backport of b13b8684a04d0bc1081104c5973c62c27dc673b0 from main.

1 files changed, 17 insertions, 0 deletions

diff --git a/tests/field_deconstruction/tests.py b/tests/field_deconstruction/tests.py
index 3b10ee0091..41353cbaaf 100644
--- a/tests/field_deconstruction/tests.py
+++ b/tests/field_deconstruction/tests.py
@@ -516,6 +516,23 @@ class FieldDeconstructionTests(SimpleTestCase):
         self.assertEqual(path, "django.db.models.ManyToManyField")
         self.assertEqual(args, [])
         self.assertEqual(kwargs, {"to": "auth.permission", "through": "auth.Group"})
+        # Test through_fields
+        field = models.ManyToManyField(
+            "auth.Permission",
+            through="auth.Group",
+            through_fields=("foo", "permissions"),
+        )
+        name, path, args, kwargs = field.deconstruct()
+        self.assertEqual(path, "django.db.models.ManyToManyField")
+        self.assertEqual(args, [])
+        self.assertEqual(
+            kwargs,
+            {
+                "to": "auth.permission",
+                "through": "auth.Group",
+                "through_fields": ("foo", "permissions"),
+            },
+        )
         # Test custom db_table
         field = models.ManyToManyField("auth.Permission", db_table="custom_table")
         name, path, args, kwargs = field.deconstruct()