Clarify .build() issue with Django>1.8 (Ref #198).

From 1.8 onwards, this crashes:

>>> a = MyModel()  # Don't save
>>> b = MyOtherModel(fkey_to_mymodel=a)

In turn, it breaks:

    class MyModelFactory(factory.django.DjangoModelFactory):
        class Meta:
            model = MyModel

    class MyOtherModelFactory(factory.django.DjangoModelFactory):
        class Meta:
            model = MyOtherModel
        fkey_to_mymodel = factory.SubFactory(MyModelFactory)

    MyOtherModelFactory.build()  # Breaks

The error message is: Cannot assign "MyModel()": "MyModel" instance isn't saved in the database.

See https://code.djangoproject.com/ticket/10811 for details.

1 files changed, 9 insertions, 0 deletions

diff --git a/tests/djapp/models.py b/tests/djapp/models.py
index 513c47c..68b9709 100644
--- a/tests/djapp/models.py
+++ b/tests/djapp/models.py
@@ -68,6 +68,15 @@ class StandardSon(StandardModel):
     pass
 
 
+class PointedModel(models.Model):
+    foo = models.CharField(max_length=20)
+
+
+class PointingModel(models.Model):
+    foo = models.CharField(max_length=20)
+    pointed = models.OneToOneField(PointedModel, related_name='pointer', null=True)
+
+
 WITHFILE_UPLOAD_TO = 'django'
 WITHFILE_UPLOAD_DIR = os.path.join(settings.MEDIA_ROOT, WITHFILE_UPLOAD_TO)