如何使用 min_length 和 max_length 验证从字符串内部 trim 空格？

Question

name = serializers.CharField(min_length=18, max_length=18, trim_whitespace=True, allow_blank=True, allow_null=True, required=False)

test_string_that_should_be_invalid = "1111111111111111 1"

test_string_valid = "111111111111111111"

Answer 1

trim 空白关键字参数没有运行任何额外的验证器。它所做的只是 trim 在将值保存到数据库时使用 .strip() 字符串末尾的空格。

def to_internal_value(self, data):
    # We're lenient with allowing basic numerics to be coerced into strings,
    # but other types should fail. Eg. unclear if booleans should represent as `true` or `True`,
    # and composites such as lists are likely user error.
    if isinstance(data, bool) or not isinstance(data, (str, int, float,)):
        self.fail('invalid')
    value = str(data)
    return value.strip() if self.trim_whitespace else value

听起来您想确保字符串中的任何地方都没有空格。为此，您需要编写 custom field-level validator。类似于：

if ' ' in value:
    raise serializers.ValidationError('Value cannot contain spaces')

如何使用 min_length 和 max_length 验证从字符串内部 trim 空格？

How to trim whitespaces from inside of string with min_length and max_length validation?

django

django-rest-framework