Quick bump to see if anyone has insight on this. On Friday, December 6, 2019 at 5:08:41 PM UTC-6, Alaina Rowe wrote: > > I have not been able to reproduce the bug I am about to describe when > DEBUG is True, whether in production on Apache or locally on the Django dev > server. So my first question is: What is all the magic that Django DEBUG > does behind the scenes? The documentation doesn't have very much > information about this. > > Now for the bug. I understand that the following description is too > bare-bones for anyone to reproduce, but I have IP to protect, and I don't > have much hope of the error being reproduced anyway. > > Suppose I have a Django project with at least two apps, app alice with > model A and app bob with model B. > > I am using UpdateWithInlinesView from django-extra-views. The error occurs > when this view constructs a formset from instances of model A. In my email > about the 500, I get a message like this: > > FieldError at /some/url/ > Cannot resolve keyword 'field_of_A' into field. Choices are: field_of_B_1, > field_of_B_2, field_of_B_3 > > I've gotten this type of error before. It normally happens when you tell a > form "I'm using model C" and "I'm using a field called debbie" and model C > doesn't have a field called debbie. That part makes sense. But this error > makes it look like it's checking against the field names of model B when it > should be checking model A. I have been racking my brain trying to figure > out how in the world the construction of a form from one model would > consult a different model from a different app. > > Furthermore, this doesn't happen most of the time, it goes away on server > restart, and it doesn't happen under DEBUG = True. So I'm wondering if it's > an app registry issue, some sort of race condition that gets the registry > out of whack. If so, then I might get somewhere by either understanding the > app registry better or understanding what DEBUG does. > > Any thoughts? >
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