Just one commaΒΆ

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
>>> bool(a)

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” :-)

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About me

My name is Reinout van Rees and I work a lot with Python (programming language) and Django (website framework). I live in The Netherlands and I'm happily married to Annie van Rees-Kooiman.

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