Djnago validation

django-validation.md

Django validation

Important note: direct model instance manager.create()/save() doesn't validate (run instance.full_clean()). Only form validate instance (calls instance.full_clean()).

ModelForm validation process (Form + Model instance):

1. form.is_valid()
2. form.errors()
3. form.full_clean() - populate errors and cleanded_data
   1. form._clean_fields() - (form.fields == model.fields)
      • field.clean()
        1. field.to_python()
        2. field.validate()
        3. field.run_validators()
   2. form._clean_form()
      • form.clean()
   3. form._post_clean() - populate instance with cleaned_data
      • instance.full_clean() - validate instance (model + cleaned_data)
        1. instance.clean_fields()
           • field.clean()
             1. field.validate()
             2. field.run_validators()
        2. instance.clean()
      • form.validate_unique()
        1. instance.validate_unique()
4. form.save()
   • form.instance.save()

Model object validation:

• model.full_clean(validate_unique=True)
  1. model.clean_fields()
  2. model.clean() - pass
  3. model.validate_unique()