implement ObjectIdAutoField.deconstruct()

Remove "auto" from path and omit default db_column from kwargs.

Author: timgraham

django_mongodb/fields/auto.py

@@ -15,6 +15,14 @@ def __init__(self, *args, **kwargs):
         kwargs["db_column"] = "_id"
         super().__init__(*args, **kwargs)
 
+    def deconstruct(self):
+        name, path, args, kwargs = super().deconstruct()
+        if self.db_column == "_id":
+            del kwargs["db_column"]
+        if path.startswith("django_mongodb.fields.auto"):
+            path = path.replace("django_mongodb.fields.auto", "django_mongodb.fields")
+        return name, path, args, kwargs
+
     def get_prep_value(self, value):
         if value is None:
             return None

tests/model_fields_/test_autofield.py

@@ -7,9 +7,9 @@ class MethodTests(SimpleTestCase):
     def test_deconstruct(self):
         field = ObjectIdAutoField()
         name, path, args, kwargs = field.deconstruct()
-        self.assertEqual(path, "django_mongodb.fields.auto.ObjectIdAutoField")
+        self.assertEqual(path, "django_mongodb.fields.ObjectIdAutoField")
         self.assertEqual(args, [])
-        self.assertEqual(kwargs, {"db_column": "_id", "primary_key": True})
+        self.assertEqual(kwargs, {"primary_key": True})
 
     def test_to_python(self):
         f = ObjectIdAutoField()