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Nagasaki45/forms.py

Created October 31, 2014 22:15
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TDD with Python book. p. 221: Better implementation for field validation.
Raw
forms.py
def clean_text(self):
data = self.cleaned_data['text']
if data in [item.text for item in self.instance.list.item_set.all()]:
raise forms.ValidationError(DUPLICATE_ITEM_ERROR)
return data
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