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I would like to make an entire inline formset within an admin change form compulsory. So in my current scenario when I hit save on an Invoice form (in Admin) the inline Order form is blank. I'd like to stop people creating invoices with no orders associated.
Anyone know an easy way to do that?
Normal validation like (required=True) on the model field doesn't appear to work in this instance.
901
The is_valid() method is used to perform validation for each field of the form, it is defined in Django Form class. It returns True if data is valid and place all data into a cleaned_data attribute.
Django formset allows you to edit a collection of the same forms on the same page. It basically allows you to bulk edit a collection of objects at the same time.
The clean() method on a Field subclass is responsible for running to_python() , validate() , and run_validators() in the correct order and propagating their errors. If, at any time, any of the methods raise ValidationError , the validation stops and that error is raised.
To display the form errors, you use form. is_valid() to make sure that it passes validation. Django says the following for custom validations: Note that any errors raised by your Form.
The best way to do this is to define a custom formset, with a clean method that validates that at least one invoice order exists.
class InvoiceOrderInlineFormset(forms.models.BaseInlineFormSet): def clean(self): # get forms that actually have valid data count = 0 for form in self.forms: try: if form.cleaned_data: count += 1 except AttributeError: # annoyingly, if a subform is invalid Django explicity raises # an AttributeError for cleaned_data pass if count < 1: raise forms.ValidationError('You must have at least one order') class InvoiceOrderInline(admin.StackedInline): formset = InvoiceOrderInlineFormset class InvoiceAdmin(admin.ModelAdmin): inlines = [InvoiceOrderInline] If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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