如何使用ReferenceProperty访问模型中的项目？
这是对我之前的问题的跟进。
我使用ReferenceProperty设置模型：
class User(db.Model):
userEmail = db.StringProperty()
class Comment(db.Model):
user = db.ReferenceProperty(User, collection_name="comments")
comment = db.StringProperty(multiline=True)
class Venue(db.Model):
user = db.ReferenceProperty(User, collection_name="venues")
venue = db.StringProperty()
Entity Kind: User
Entity Key: ag1oZWxsby0xLXdvcmxkcgoLEgRVc2VyGBUM
ID: 21
userEmail: az@example.com
Entity Kind: Venue
Entity Key: ag1oZWxsby0xLXdvcmxkcgsLEgVWZW51ZRhVDA
ID: 85
venue (string): 5 star venue
user (Key): ag1oZWxsby0xLXdvcmxkcgoLEgRVc2VyGBUM
User: id=21
hw.py
query = User.all()
results = query.fetch(10)
self.response.out.write("<html><body><ol>")
for result in results:
self.response.out.write("<li>")
self.response.out.write(result.userEmail)
self.response.out.write(result.venues)
self.response.out.write("</li>")
self.response.out.write("</ol></body></html>")
self.response.out.write(result.userEmail)
self.response.out.write(result.venues)
result.venues
venue
ReferenceProperty
userEmail
Venue
Comment
Venue
Comment
没有找到相关结果
已邀请:
1 个回复
寇剩
实际上是一个查询对象。所以你需要获取或迭代它。 尝试用循环替换线：query = User.all() users = query.fetch(10) self.response.out.write("<html><body><ol>") for user in users: self.response.out.write("<li>") self.response.out.write(user.userEmail) self.response.out.write("<ul>") # Iterate over the venues for venue in user.venues: self.response.out.write("<li>%s</li>" % venue.venue) self.response.out.write("</ul></li>") self.response.out.write("</ol></body></html>")