/Python/Validate delete inline formset django

Validate delete inline formset django

class RequiredImageInlineFormset(forms.models.BaseInlineFormSet):
    """ Makes inline fields required """

    def clean(self):
        # get forms that actually have valid data
        count = 0
        delete_checked = 0
        for form in self.forms:
            try:
                if form.cleaned_data:
                    count += 1
                    if form.cleaned_data['DELETE']:
                        delete_checked += 1
                    if not form.cleaned_data['DELETE']:
                        delete_checked -= 1
            except AttributeError:
                # annoyingly, if a subform is invalid Django explicity raises
                # an AttributeError for cleaned_data
                pass

        # Case no images uploaded
        if count < 1:
            raise forms.ValidationError(
                'At least one image is required.')

        # Case one image added and another deleted
        if delete_checked > 0 and ProductImage.objects.filter(product=self.instance).count() == 1:
            raise forms.ValidationError(
                "At least one image is required.")

Source: stackoverflow.com

Similar codes

0 vote203 views1 answer
How to use str()
Python
0 vote157 views1 answer
Python align label left
Python
1 vote153 views1 answer
Python set and dictionary comprehensions
Python
0 vote158 views1 answer
Lists and for loops
Python
0 vote227 views1 answer
Escape sequence in python
Python
2 votes185 views1 answer
Make a script run itself again python
Python
1 vote154 views1 answer
UnicodeEncodeError: 'latin-1' codec can't encode character '\u2013' in position 83: ordinal not in range(256)
Python
3 votes165 views2 answers
Pandas check length of string
Python
57 votes261 views6 answers
How to make a class in python
Python
-1 vote149 views1 answer
Function TBone() if 2=2 then print("Sup") end
Python