def save_model(self, request, obj: Booking, form: ModelForm, change: bool):
try:
with transaction.mark_for_rollback_on_error() as trans:
super().save_model(request, obj, form, change)
except:
form.add_error(NON_FIELD_ERRORS,
"The room is already booked on some of those days")
def add_error(self, field, error):
"""
Safely adds errors. There was an issue where the `cleaned_data`
attribute wasn't created after `is_valid` was called. This ensures
that the `cleaned_data` attribute is there.
"""
if getattr(self, "cleaned_data", None) is None or self.cleaned_data is None:
self.cleaned_data = {}
ModelForm.add_error(self, field, error)
def form_valid(self, form: ModelForm):
form.instance.slug = slugify(form.instance.name)
try:
return super(LocationUpdateView, self).form_valid(form)
except InvalidMove:
form.add_error(
'parent',
ValidationError('World cannot be its own parent!',
code='invalid'))
return self.form_invalid(form)
