French local : Use class Validators for SIRET and SIREN model fields, do not format output

[LLyaudet]

French local : Use class Validators for SIRET and SIREN model fields, do not format output

[LLyaudet]

For the annoying formatting, I have found a workaround :
https://stackoverflow.com/questions/61896109/changing-max-length-on-a-charfield-for-a-modelform

class MyModelForm(forms.ModelForm):
    siret = FRSIRETField(max_length=17)

[LLyaudet]

If you want to keep some arguments from the model, the workaround is more complicated (and ugly) :

class MyModelForm(forms.ModelForm):
    # siret = FRSIRETField(max_length=17) will not work with blank=True

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.fields["siret"].max_length = 17
        for i, validator in enumerate(self.fields["siret"].validators):
            if isinstance(validator, MaxLengthValidator):
                self.fields["siret"].validators[i] = MaxLengthValidator(17)
                break
        self.fields["siret"].widget.attrs["maxlength"] = 17