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Python Django Forms Forms Cleaning a Whole Form

I thought cleaned_data is a built in method

In previous videos , we just used

           if form.is_valid():

no need to call

         cleaned_data= super().clean()

Can't I just use cleaned_data['something'] directly without calling cleaned_data=super( )?

1 Answer

Chris Freeman
Chris Freeman
Treehouse Moderator 68,404 Points

In your top example, form.cleaned_data is created by running the form.is_valid() method. This method checks all of the fields and creates the attribute cleaned_data as a dictionary of field names and values.

The docs say:

A Form instance has an is_valid() method, which runs validation routines for all its fields. When this method is called, if all fields contain valid data, it will:

  • return True
  • place the form’s data in its cleaned_data attribute.

In this clean method, the goal is to verify the data entered is correct beyond just meeting the field description requirements.

More information available in the docs "Cleaning and validating fields that depend on each other"

Post back if you need more help. Good luck!!