XML ParseError：文档元素之后的垃圾：自定义验证器中的第1行，第11列（Wagtail）

Question

如果在wagtail CMS中将'\ n'字符键入RichTextField，则验证程序的__call__方法中会出现XML ParseError错误。

这里发生错误plain_text = ''.join(fromstring(value).itertext())

TRACEBACK

from xml.etree.ElementTree import fromstring

from django.core.exceptions import ValidationError
from django.utils.deconstruct import deconstructible


@deconstructible
class ProhibitBlankRichTextValidator:
    """
    Validate that the incoming html-string contains plain text characters.

    Common usage: Proper RichTextField validation
    Reason:
        Handling improper RichTextField validation by Wagtail 2.1:
            https://github.com/wagtail/wagtail/issues/4549
    """

    message = "This field is required."

    def __init__(self, message=None):
        if message is not None:
            self.message = message

    def __call__(self, value):
        plain_text = ''.join(fromstring(value).itertext())  # Escape html tags
        if not plain_text:
            raise ValidationError(self.message)

Answer 1

富文本字段的值不能保证是完整的有效XML文档，因为它可以包含多个顶级元素，这在XML中是不允许的。如果要通过强制执行此操作的XML解析器运行该值，则需要首先将其包装在外部元素（如<rich-text>...</rich-text>）中。