make create/delete_model() handle M2M tables

Author: timgraham

django_mongodb/features.py

@@ -126,9 +126,6 @@ class DatabaseFeatures(BaseDatabaseFeatures):
         "schema.tests.SchemaTests.test_remove_unique_together_does_not_remove_meta_constraints",
         "schema.tests.SchemaTests.test_unique_together",
         # ManyToManyField
-        "schema.tests.SchemaTests.test_m2m_create",
-        "schema.tests.SchemaTests.test_m2m_create_custom",
-        "schema.tests.SchemaTests.test_m2m_create_inherited",
         "schema.tests.SchemaTests.test_m2m_rename_field_in_target_model",
         "schema.tests.SchemaTests.test_m2m_repoint",
         "schema.tests.SchemaTests.test_m2m_repoint_custom",

django_mongodb/schema.py

@@ -4,8 +4,16 @@
 class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):
     def create_model(self, model):
         self.connection.database.create_collection(model._meta.db_table)
+        # Make implicit M2M tables.
+        for field in model._meta.local_many_to_many:
+            if field.remote_field.through._meta.auto_created:
+                self.create_model(field.remote_field.through)
 
     def delete_model(self, model):
+        # Delete implicit M2m tables.
+        for field in model._meta.local_many_to_many:
+            if field.remote_field.through._meta.auto_created:
+                self.delete_model(field.remote_field.through)
         self.connection.database[model._meta.db_table].drop()
 
     def add_field(self, model, field):