Class ErrorList

django/forms/utils.py:141–209

A collection of errors that knows how to display itself in various formats.

class ErrorList(UserList, list, RenderableErrorMixin):
    """
    A collection of errors that knows how to display itself in various formats.
    """

    template_name = "django/forms/errors/list/default.html"
    template_name_text = "django/forms/errors/list/text.txt"
    template_name_ul = "django/forms/errors/list/ul.html"

    def __init__(self, initlist=None, error_class=None, renderer=None, field_id=None):
        super().__init__(initlist)

        if error_class is None:
            self.error_class = "errorlist"
        else:
            self.error_class = "errorlist {}".format(error_class)
        self.renderer = renderer or get_default_renderer()
        self.field_id = field_id

    def as_data(self):
        return ValidationError(self.data).error_list

    def copy(self):
        copy = super().copy()
        copy.error_class = self.error_class
        copy.renderer = self.renderer
        return copy

    def get_json_data(self, escape_html=False):
        errors = []
        for error in self.as_data():
            message = next(iter(error))
            errors.append(
                {
                    "message": escape(message) if escape_html else message,
                    "code": error.code or "",
                }
            )
        return errors

    def get_context(self):
        return {
            "errors": self,
            "error_class": self.error_class,
        }

    def __repr__(self):
        return repr(list(self))

    def __contains__(self, item):
        return item in list(self)

    def __eq__(self, other):
        return list(self) == other

    def __getitem__(self, i):
        error = self.data[i]
        if isinstance(error, ValidationError):