@@ -51,8 +51,8 @@ class AssignmentForm(forms.ModelForm):
'period_ends',
'agreement_terms',
'attestation_of_copyright',
]
def clean_period_ends(self):
if 'period_begins' in cleaned_data and 'period_ends' in cleaned_data and cleaned_data['period_begins'] > cleaned_data['period_ends']:
if 'period_begins' in self.cleaned_data and 'period_ends' in self.cleaned_data and self.cleaned_data['period_begins'] and self.cleaned_data['period_ends'] and self.cleaned_data['period_begins'] > self.cleaned_data['period_ends']:
raise ValidationError('End of period is before start')