I recently ran into an issue when trying to generate an image of my project's models using
graph_models command. Unfortunately, googling for the error didn't turn up any solutions, so I'm dumping some info here (just in case!).
For the record, I was using django_extensions, version 1.2.5 (the latest release as of this post), and Django 1.4.2 (yeah... it's old)
Running the following command:
$ ./manage.py graph_models my_app > my_models.dot
Gave me the following error
Traceback (most recent call last): File "./manage.py", line 10, in
execute_from_command_line(sys.argv) File "/home/vagrant/.virtualenvs/my_app/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 443, in execute_from_command_line utility.execute() File "/home/vagrant/.virtualenvs/my_app/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 382, in execute self.fetch_command(subcommand).run_from_argv(self.argv) File "/home/vagrant/.virtualenvs/my_app/local/lib/python2.7/site-packages/django/core/management/base.py", line 196, in run_from_argv self.execute(*args, **options.__dict__) File "/home/vagrant/.virtualenvs/my_app/local/lib/python2.7/site-packages/django/core/management/base.py", line 232, in execute output = self.handle(*args, **options) File "/home/vagrant/.virtualenvs/my_app/local/lib/python2.7/site-packages/django_extensions/management/commands/graph_models.py", line 72, in handle dotdata = generate_dot(args, cli_options=cli_options, **options) File "/home/vagrant/.virtualenvs/my_app/local/lib/python2.7/site-packages/django_extensions/management/modelviz.py", line 168, in generate_dot if field == pk: File "/home/vagrant/.virtualenvs/my_app/local/lib/python2.7/site-packages/django/db/models/fields/__init__.py", line 128, in __cmp__ return cmp(self.creation_counter, other.creation_counter) AttributeError: 'NoneType' object has no attribute 'creation_counter'
I'm not entirely sure, but it seems related to this issue.
Rather, the solution that worked for me (YMMV): Uninstall your current version:
pip uninstall django-extensions
Then install the current development version from github:
pip install -e git+https://github.com/django-extensions/django-extensions.git#egg=django_extensions
Hope that helps someone else!
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