'Django Change all other Boolean fields except one

I have a model which has a boolean field:

class Library(SocialLinksModelMixin):
    """
    Represents book shelves and places where people have / leave books.
    """
    user = models.ForeignKey(...)
    is_main = models.BooleanField(default=False)

User can have multiple Libraries and I would like to allow setting the main one to ease the flow in the app.

What is the easiest way for switching only one Library is_main to True and all others to False (There is always only 1 Library for a user that is main)

I'm thinking about querying for all libraries and updating each and every one. Maybe there is another way to do that functionality?

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'Django Change all other Boolean fields except one

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