我正在跟踪google文档https://developers.google.com/appengine/articles/modeling
中One to Many的{{1}}关系
Modeling Entity Relationships如何查询class Contact(db.Model):
# Basic info.
name = db.StringProperty()
birth_day = db.DateProperty()
# Address info.
address = db.PostalAddressProperty()
# The original phone_number property has been replaced by
# an implicitly created property called 'phone_numbers'.
# Company info.
company_title = db.StringProperty()
company_name = db.StringProperty()
company_description = db.StringProperty()
company_address = db.PostalAddressProperty()
class PhoneNumber(db.Model):
contact = db.ReferenceProperty(Contact,
collection_name='phone_numbers')
phone_type = db.StringProperty(
choices=('home', 'work', 'fax', 'mobile', 'other'))
number = db.PhoneNumberProperty()
scott = Contact(name='Scott')
scott.put()
PhoneNumber(contact=scott,
phone_type='home',
number='(650) 555 - 2200').put()
PhoneNumber(contact=scott,
phone_type='mobile',
number='(650) 555 - 2201').put()
以获取号码(650) 555 - 2201的所有者？
答案 0 :(得分：0)
您可以查询（650）555 - 2201以获取数字scott的所有权，如下所示：
phone = PhoneNumber.all（）。filter（＆＃39; number =＆＃39;，＆＃39;（650）555 - 2201＆＃39;）
print＆＃39;％s＆＃39; ％（phone.contact.name）