Just one comma¶

Tags: django, python

In Django, if you say managed = False in a model’s Meta, you tell Django not to touch the database table. So: no automatic database migrations, for instance.

Now, what is the problem if you have managed = False, and Django does do migrations?

Some of you will have seen the error already.

The comma after False is the problem:

>>> a = False,
>>> a
(False,)
>>> bool(a)
True

The comma turns it into a tuple. And a non-empty tuple evaluates to True!

I found it quite funny. My colleague was torn between “extremely relieved” and “extremely annoyed” :-)