On Mar 14, 8:04 am, Sergio <sergio....@gmail.com> wrote:
> wow, that's interesting. I was not aware if this.
>
> So, coming to the real question, here is my use case which raised this
> questions:
>
> I've a class in the model with two CharFields. When validating data
> inputs, I need to check that, if the user filled field A, then also
> field B should contains some value
>
> - model definition
>
> class MyClass(models.Model):
> ...
> A = models.CharField(max_length=20)
> B = models.CharField(max_length=20)
> ...
>
> - validation
> ...
> A = cleaned_data.get("A")
> B = cleaned_data.get("B")
> if A != "" and B == "":
> self._errors["B"] = ErrorList(["B must be filled because A is
> filled"])
>
> is this ok and independent from all DB backends as opposed to (if A
> is not None and B is None) which seems not work?
Yes, a form CharField will always represent an empty value as '', not
None.
Note that it shouldn't matter for your use case, though. The
condition `if A and not B:` will work regardless of whether an empty
value is '' or None.
Regards,
Ian
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