验证需要任一字段 - MongoEngine

Question

我为 RSS 提要创建了 class：

from mongoengine import *

class RSS(Document):
    time_added = DateTimeField(default=datetime.datetime.utcnow)

    link = StringField(required=True)
    title = StringField(required=True)
    last_entry_id = StringField(required=True)
    last_etag = StringField()
    last_modified = DateTimeField()

    subscribed = ListField(IntField(), required=True)

    meta = {
        'collection': 'rss',
        'indexes': ['$title']
    }

根据我的要求，我想做到 last_etag 中的一个 或两者和 last_modified 字段存在（即必需）。这在 MongoEngine 中可能吗？

Answer 1

对于 multi-field 验证，您可以覆盖 Document.clean 方法，例如

from mongoengine import *
import datetime as dt

class RSS(Document):
    etag = StringField()
    last_modified = DateTimeField()

    def clean(self):
        if not self.etag and not self.last_modified:
            raise ValidationError('etag and or last_modified are required')


RSS().save()    # Fails with ValidationError (etag and/or last_modified are required)
RSS(etag='123456789').save()                                        # passes
RSS(etag='123456789', last_modified=dt.datetime.utcnow()).save()    # passes

您可以查看 docs 了解更多信息。

验证需要任一字段 - MongoEngine

Either field is required for validation - MongoEngine

mongodb

mongoengine

python-3.x