Fix _bulk_create for ManyToManyField with custom through models (#477)

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ### Added
 
 ### Changed
+- Fix `_bulk_create` for ManyToManyField using custom `through` models ([#477](https://github.com/model-bakers/model_bakery/issues/477))
 - [dev] Clean up stale TODO and fix signal handler leak in m2m test
 
 ### Removed

model_bakery/baker.py

@@ -940,8 +940,8 @@ def bulk_create(baker: Baker[M], quantity: int, **kwargs) -> list[M]:
                     [
                         through_model(
                             **{
-                                field.remote_field.name: entry,
-                                field.related_model._meta.model_name: obj,
+                                field.m2m_field_name(): entry,
+                                field.m2m_reverse_field_name(): obj,
                             }
                         )
                         for obj in kwargs[field.name]

tests/test_baker.py

@@ -458,6 +458,31 @@ def test_regression_many_to_many_field_is_accepted_as_kwargs(self):
         assert store.customers.count() == 3
         assert models.Person.objects.count() == 6
 
+    @pytest.mark.django_db
+    def test_bulk_create_with_m2m(self):
+        """Regression test for issue #477."""
+        employees = baker.make(models.Person, _quantity=3)
+        stores = baker.make(
+            models.Store, employees=employees, _quantity=2, _bulk_create=True
+        )
+
+        assert models.Store.objects.count() == 2
+        assert stores[0].employees.count() == 3
+        assert stores[1].employees.count() == 3
+
+    @pytest.mark.django_db
+    def test_bulk_create_with_m2m_through_model(self):
+        """Regression test for issue #477 - custom through model."""
+        students = baker.make(models.Person, _quantity=3)
+        schools = baker.make(
+            models.School, students=students, _quantity=2, _bulk_create=True
+        )
+
+        assert models.School.objects.count() == 2
+        assert schools[0].students.count() == 3
+        assert schools[1].students.count() == 3
+        assert models.SchoolEnrollment.objects.count() == 6
+
     @pytest.mark.django_db
     def test_create_many_to_many_with_iter(self):
         students = baker.make(models.Person, _quantity=3)