Django: how to cleanup form fields and avoid code duplication

Question

Quite often I need to filter some form data before using it (saving to database etc.) Let\'s say I want to strip whitespaces and replace repeating whitespaces with a single

Answer 1

as i know Django don't have any native solutions to resolve you question. I can show only how i resolve this problem for myself. I advice you to use decorator for you ModelForm. Here the working code(also i use logging module):

#DECORATOR
def applyValidators(model_form):
    def apply(*args,**kwargs):
        try:
            if hasattr(model_form.Meta.model,"validators"):
                for field_name,fnc in model_form.Meta.model.validators.items():
                    setattr(model_form,"clean_%s" % field_name,fnc)
        except Exception,err:
            logging.error(str(err))
        return model_form(*args,**kwargs)
    return apply

#VALIDATORS
def validator(*args,**kwargs):
    return "SOMEVALUE"

#MODEL
class MyModel(models.Model):
    #Your fields
    .......
    .......
    .......

    #VALIDATE DICT
    validators = {"username":validator,"email":validator}    

#MODEL FORM
@applyValidators
class MyModelForm(forms.ModelForm):
    class Meta:
        model = MyModel
    .......
    .......
    .......