def add_error(self, field, error):
"""
Update the content of `self._errors`.
The `field` argument is the name of the field to which the errors
should be added. If its value is None the errors will be treated as
NON_FIELD_ERRORS.
The `error` argument can be a single error, a list of errors, or a
dictionary that maps field names to lists of errors. What we define as
an "error" can be either a simple string or an instance of
ValidationError with its message attribute set and what we define as
list or dictionary can be an actual `list` or `dict` or an instance
of ValidationError with its `error_list` or `error_dict` attribute set.
If `error` is a dictionary, the `field` argument *must* be None and
errors will be added to the fields that correspond to the keys of the
dictionary.
"""
if not isinstance(error, ValidationError):
# Normalize to ValidationError and let its constructor
# do the hard work of making sense of the input.
error = ValidationError(error)
if hasattr(error, 'error_dict'):
if field is not None:
raise TypeError(
"The argument `field` must be `None` when the `error` "
"argument contains errors for multiple fields."
)
else:
error = error.error_dict
else:
error = {field or NON_FIELD_ERRORS: error.error_list}
for field, error_list in error.items():
if field not in self.errors:
if field != NON_FIELD_ERRORS and field not in self.fields:
raise ValueError(
"'%s' has no field named '%s'." % (self.__class__.__name__, field))
if field == NON_FIELD_ERRORS:
self._errors[field] = self.error_class(error_class='nonfield')
else:
self._errors[field] = self.error_class()
self._errors[field].extend(error_list)
if field in self.cleaned_data:
del self.cleaned_data[field]
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