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Custom BaseInlineFormSet to check for duplicates in a inline formset
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| class CustomBaseInlineFormSet(BaseInlineFormSet): | |
| """ | |
| Custom BaseInlineFormSet with overridden clean method to look for | |
| duplicates in the inline formset. | |
| A message will appear under the offending field. | |
| The field to be evaluated must be provided. | |
| Attributes | |
| field_name(string): name of the field to be verified. Default is None | |
| msg (string): the message that will appear under the field. Default | |
| value is 'Duplicated field' | |
| """ | |
| field_name = None | |
| msg = 'Duplicated field' | |
| def clean(self): | |
| if self.field_name is None: | |
| raise ImproperlyConfigured('field_name was not provided.') | |
| super().clean() | |
| if any(self.errors): | |
| return | |
| field_name = self.field_name | |
| msg = self.msg | |
| records = [] | |
| for form in self.forms: | |
| if field_name in form.cleaned_data: | |
| field = form.cleaned_data[field_name] | |
| if field in records: | |
| form.add_error( | |
| field_name, ValidationError(msg, code='invalid') | |
| ) | |
| records.append(field) |
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