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Python Django Forms Forms Create a Validator

Posted by Noam Sellam
Noam Sellam
3,923 Points

can't pass the custom validators challenge in django forms course -

how do i validate the email correctly?

myproject/forms.py 
from django import forms

def not_treehouse(value):
        if "@teamtreehouse.com".lower() not in value.lower():
            raise forms.ValidationError('hey!!')
        return value

class LeadShareForm(forms.Form):
    email = forms.EmailField()
    link = forms.URLField()
    honeypot = forms.CharField(widget=forms.HiddenInput, required=False)
    def clean_honeypot(self):
        honey = self.cleaned_data['honeypot']
        if len(honey):
            raise forms.ValidationError('Bad robot!')
        return honey

1 Answer

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 68,423 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,423 Points

You have the right idea, the issue is your polarity is reversed: the error should be raised if "@teamtreehouse.com" is in the email address. So, remove the "not" from the if statement.

Hasan Ahmad
Hasan Ahmad
6,727 Points
Hasan Ahmad
Hasan Ahmad
6,727 Points

Why do we have to return Value??

Chris Freeman
Chris Freeman
Treehouse Moderator 68,423 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,423 Points

Hasan Ahmad, good question! The clean functions in Django, if defined, are used to provide additional form data cleaning and inspection beyond the standard built-in form data sanitation performed in cleaned_data. If a clean method is defined, it is automatically called by the form data cleaning code which expects to receive back data (honey in this case) to replace the data that was already in cleaned_data['honeypot']. Even though the method clean_honey_pot doesn't actually modify the data, it still needs to pass it back to the data cleaning code.