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I have a field allow NULL value, but how can I set it back to NULL? not blank
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One can also add more built-in field validations for applying or removing certain constraints on a particular field. null=True will make the field accept NULL values. Blank values for Django field types such as DateTimeField or ForeignKey will be stored as NULL in the database.
Unlike other programming languages such as PHP or Java or C, Python does not have a null value. Instead, there is the 'None' keyword that you can use to define a null value.
“django model fields nullable” Code Answer'sblank determines whether the field will be required in forms. This includes the admin and your custom forms. If blank=True then the field will not be required, whereas if it's False the field cannot be blank.
In Django queryset we have __isnull to check if a value is null. Here were filtering all the values from MyModel model, which have an alias = Null. exclude allows you to pass multiple arguments, it will the then check for every argument. If your query is still more complex, you can use Django's Q Objects.
Assign None.
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