强制严格的字段。日期格式与棉花糖反序列化

对于未来证明代码,我发现 Date 棉花糖3.0.0b17中的类现在是 DateTime 而不是 Field ,使其继承 format relevant commit ).

对于版本2.15.3和2.X.X,我找不到任何内置函数。一个解决办法是修补 fields.Date 班级。经过修改后,它看起来是这样的:

class Date(Field):
    """ISO8601-formatted date string.

    :param kwargs: The same keyword arguments that :class:`Field` receives.
    """
    default_error_messages = {
        'invalid': 'Not a valid date.',
        'format': '"{input}" cannot be formatted as a date.',
    }

    def __init__(self, format=None, **kwargs):
        super(Date, self).__init__(**kwargs)
        self.dateformat = format

    def _serialize(self, value, attr, obj):
        if value is None:
            return None
        try:
            return value.isoformat()
        except AttributeError:
            self.fail('format', input=value)
        return value

    def _deserialize(self, value, attr, data):
        """Deserialize an ISO8601-formatted date string to a
        :class:`datetime.date` object.
        """
        if not value:  # falsy values are invalid
            self.fail('invalid')
        elif self.dateformat:
            try:
                return dt.datetime.strptime(value, self.dateformat).date()
            except (TypeError, AttributeError, ValueError):
                raise self.fail('invalid')
        try:
            return utils.from_iso_date(value)
        except (AttributeError, TypeError, ValueError):
            self.fail('invalid')

这里的修改是 __init__ 定义和定义 _deserialize elif self.dateformat -已添加子句。这允许我使用提交的格式反序列化,例如:

d = fields.Date('%Y-%m-%d') # now accepts a format
d.deserialize('2018-01-01T05:06:08.012312+02:00')  # fails, as desired