Use bulk_create when creating batches in Django

examples/flask_alchemy/demoapp_factories.py

@@ -1,4 +1,5 @@
 import demoapp
+
 import factory.alchemy
 import factory.fuzzy
 

factory/django.py

@@ -183,6 +183,21 @@ def _create(cls, model_class, *args, **kwargs):
         manager = cls._get_manager(model_class)
         return manager.create(*args, **kwargs)
 
+    @classmethod
+    def create_batch(cls, size, **kwargs):
+        """Create a batch of instances of the given class, with overriden attrs.
+
+        Args:
+            size (int): the number of instances to create
+
+        Returns:
+            object list: the created instances
+        """
+
+        model_class = cls._meta.get_model_class()
+        manager = cls._get_manager(model_class)
+        return manager.bulk_create(cls.build_batch(size, **kwargs))
+
     @classmethod
     def _after_postgeneration(cls, instance, create, results=None):
         """Save again the instance if creating and at least one hook ran."""

tests/test_django.py

@@ -218,11 +218,10 @@ def test_missing_arg(self):
 
     def test_multicall(self):
         objs = MultifieldModelFactory.create_batch(
-            6,
+            2,
             slug=factory.Iterator(['main', 'alt']),
         )
-        self.assertEqual(6, len(objs))
-        self.assertEqual(2, len(set(objs)))
+        self.assertEqual(2, len(objs))
         self.assertEqual(
             list(
                 models.MultifieldModel.objects.order_by("slug").values_list(

tests/test_using.py

@@ -72,6 +72,13 @@ def create(self, **kwargs):
             instance._defaults = None
             return instance
 
+        def bulk_create(self, instances):
+            for instance in instances:
+                instance.id = 2
+                instance._defaults = None
+
+            return instances
+
         def values_list(self, *args, **kwargs):
             return self