Hi, I think that I have found a bug on the system check: it accepts a string as value for CharField.max_length argument.
It happens only if the string can be converted to int (e.g. max_length='16'). Otherwise shows fields.E121 error (e.g. max_length='foo'). from django.db import models class Foo(models.Model): bar = models.CharField(max_length='16') # following code raises an Exception obj = Foo(bar='lorem ipsum') obj.clean_fields() Traceback: >>> obj = Foo(bar='lorem ipsum') >>> obj.clean_fields() Traceback (most recent call last): File "<console>", line 1, in <module> File "/usr/local/lib/python3.4/dist-packages/django/db/models/base.py", line 1167, in clean_fields setattr(self, f.attname, f.clean(raw_value, self)) File "/usr/local/lib/python3.4/dist-packages/django/db/models/fields/__init__.py", line 589, in clean self.run_validators(value) File "/usr/local/lib/python3.4/dist-packages/django/db/models/fields/__init__.py", line 541, in run_validators v(value) File "/usr/local/lib/python3.4/dist-packages/django/core/validators.py", line 280, in __call__ if self.compare(cleaned, self.limit_value): File "/usr/local/lib/python3.4/dist-packages/django/core/validators.py", line 319, in <lambda> compare = lambda self, a, b: a > b TypeError: unorderable types: int() > str() Best regards, Santiago -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-users+unsubscr...@googlegroups.com. To post to this group, send email to django-users@googlegroups.com. Visit this group at http://groups.google.com/group/django-users. To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/7f920d86-1657-4922-a6a6-603ab0f846a3%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.