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Modify value of a Django form field during clean() and validate again


Modify value of a Django form field during clean() and validate again

By : Caramel
Date : November 23 2020, 03:01 PM
Hope that helps A q&d hack would be to fix the value in data directly in the form's __init__ (nb : untested code):
code :
class UsuarioForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super(UsuarioForm, self).__init__(*args, **kwargs)
        if self.data:
            # make the QueryDict mutable
            self.data = self.data.copy()
            # remove dots from data["cpf"]
            if "cpf" in self.data:
                self.data["cpf"] = self.data["cpf"].replace(".", "")
        # ...


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Modify value of a Django form field during clean()

Modify value of a Django form field during clean()


By : Ravidas
Date : March 29 2020, 07:55 AM
Hope this helps change self data in the clean method to change the value which gets displayed
Validate/clean a FileField on a non-model form in Django?

Validate/clean a FileField on a non-model form in Django?


By : user2355952
Date : March 29 2020, 07:55 AM
I wish this helpful for you You're not passing request.FILES into the form when you instantiate it in the post.
code :
 form = TestForm(request.POST, request.FILES)
Set field value in Django Form clean() method, if this field not passed in constructor

Set field value in Django Form clean() method, if this field not passed in constructor


By : Dolev Shapira
Date : March 29 2020, 07:55 AM
wish helps you The previous answer would work, but I like encapsulating all the form's internal operations like what to show and what not, within the form. I know you mentioned you don't want to send a field value to the constructor, but if you don't mind sending the user, your solution would work. i.e., your constructor:
code :
def __init__(self, user):
    self.user = user
    super(BaseForm, self).__init__()
active = forms.BooleanField(widget=forms.HiddenInput)
def save (self):
    super(BaseForm, self).save()
    if user.is_admin():
        self.instance.active=True
    super(BaseForm, self).save()
Django : Validate data by querying the database in a model form (using custom clean method)

Django : Validate data by querying the database in a model form (using custom clean method)


By : Damien S
Date : March 29 2020, 07:55 AM
To fix this issue There are quite a few things wrong with this code.
Firstly, you're not supposed to call clean explicitly. Django does it for you automatically when you call form.is_valid(). And because it's done automatically, you can't pass extra arguments. You need to pass the argument in when you instantiate the form, and keep it as an instance variable which your clean code can reference.
code :
class SubsytemForm(forms.ModelForm):  

    class Meta:
        model = Subsystem
        exclude = ('project_name')

    def __init__(self, *args, **kwargs):
        self.project_name = kwargs.pop('project_name', None)
        super(SubsystemForm, self).__init__(*args, **kwargs)

    def clean_subsystem_name(self):
        form_subsystem_name = self.cleaned_data.get("subsystem_name")

        existing = Subsystem.objects.filter(
                       project__project_name=self.project_name,
                       subsytem_name=form_subsystem_name
                   ).exists()

        if existing:
            raise forms.ValidationError(u"Subsystem already existing")

        return form_subsystem_name
Django form wizard validate (clean) form using previous form

Django form wizard validate (clean) form using previous form


By : Francis
Date : March 29 2020, 07:55 AM
Hope this helps It can be achieved as follows:
Overwrite the get_form_initial(self, step) method of the wizard. Handle the later step as follows: retrieve the cleaned data of the earlier step; retrieve the initial data for this step (super call); merge the two dictionaries and return the result; In the clean method of the later form access the data of the earlier form via the self.initial field.
code :
def get_form_initial(self, step):
    if step == '5':
        step4 = self.get_cleaned_data_for_step('3')
        res = super(DenovoPatternWizard, self).get_form_initial(step)
        res['extendsequencedb'] = {}
        res['extendsequencedb']['include_most_similar_pattern_sequences'] = step4['sequencepatternassignment'][
            'number_sites_per_pattern']
        return res
def clean(self):
    cleaned_data = super(InputDenovoPatternPatternForm, self).clean()
    # compatibility of earlier and current step

    if self.initial['timeseries_data'].number_timepoints != cleaned_data['pattern_data'].number_timepoints:
        raise ValidationError("The time-series and pattern input files need to have the same number of timepoints (%d and %d respectively)." %
                              (self.initial['timeseries_data'].number_timepoints, cleaned_data['pattern_data'].number_timepoints))
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