def clean(self, value):
"""Validate the date range input `value` should be a 2-tuple or list or
datetime objects or None."""
clean_data = []
errors = []
if self.disabled and not isinstance(value, list):
value = self.widget.decompress(value)
# start date is always required
if not value:
raise ValidationError(self.error_messages["required"],
code="required")
# somehow we didn't get a list or tuple of datetimes
if not isinstance(value, (list, tuple)):
raise ValidationError(self.error_messages["invalid"],
code="invalid")
for i, (field, value) in enumerate(zip(self.fields, value)):
limit = ("start", "end")[i]
if value in self.empty_values and (limit == "lower"
or self.require_all_fields):
error = ValidationError(
self.error_messages[f"{limit}_required"],
code=f"{limit}_required",
)
error.subfield = i
raise error
try:
clean_data.append(field.clean(value))
except ValidationError as e:
for error in e.error_list:
if "Enter a valid date" in str(error):
error.message = f"Enter a valid {limit} date."
error.subfield = i
errors.append(error)
if errors:
raise ValidationError(errors)
out = self.compress(clean_data)
self.validate(out)
self.run_validators(out)
return out
