def _is_choice_selected(field, value, choice):
"""Checks if a choice is selected. If the field is a multi select
field it's checked if the choice is in the passed iterable of values,
otherwise it's checked if the value matches the choice.
"""
if field.multiple_choices:
for value in value:
if _value_matches_choice(value, choice):
return True
return False
return _value_matches_choice(value, choice)
def convert(self, value):
if not value and not self.required:
return
if self.choices:
for choice in self.choices:
if isinstance(choice, tuple):
choice = choice[0]
if _value_matches_choice(value, choice):
return choice
message = self.messages['invalid_choice']
if message is None:
message = self.gettext('Please enter a valid choice.')
raise ValidationError(message)