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relationship_test.py
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relationship_test.py
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#-*-coding:utf-8
__author__ = 'qitian'
from alchemy import db
from datetime import datetime
# tags = db.Table('tags',
# db.Column('tag_id', db.Integer, db.ForeignKey('tag.id')),
# db.Column('page_id', db.Integer, db.ForeignKey('page.id'))
# )
#
# class Page(db.Model):
# #文章对象,标签是多对多
# __tablename__ = 'page'
# id = db.Column(db.Integer, primary_key=True)
# tags = db.relationship('Tag', secondary=tags,
# backref=db.backref('pages', lazy='dynamic'))
# title = db.Column(db.String(200), unique=True)
# date = db.Column(db.DateTime)
# page = db.Column(db.String(20000))
#
# def __init__(self, title, date, page):
# self.title = title
# self.date = date
# self.page = page
#
# def __repr__(self):
# return '<Page %r>' % self.title
#
# class Tag(db.Model):
# id = db.Column(db.Integer, primary_key=True)
# name = db.Column(db.String(20), unique=True)
# def __init__(self, name):
# self.name = name
#
# def __repr__(self):
# return '<Tag: %r>' % self.name
#
#
# if __name__ == '__main__':
# db.create_all()
#
# def gen_tags():
# ''' 生成一个 Tag 对象组成的列表'''
# tags_list = []
# for i in list(range(10)):
# tag_name = "tag_" + str(i)
# tag = Tag(name=tag_name)
# tags_list.append(tag)
# return tags_list
#
#
# def gen_pages(count=10):
# ''' 生成一个 Page 对象组成的列表,每个 Page 对象,都有 X 个 tags,来自上面 gen_tags 生成的列表。 '''
# pages_list = []
# tags = gen_tags()
# for i in list(range(10)):
# title = page = "page" + str(i)
#
# page_obj = Page(title=title, page=page, date=datetime.utcnow())
# page_obj.tags = tags # 将 gen_tags 生成的 Tag 对象们添加进去。
# pages_list.append(page_obj)
#
# return pages_list
#
# pages = gen_pages() # 生成的 Page 对象列表。
# db.session.add_all(pages) # 一次性添加所有 Page。
# db.session.commit() # 提交到数据库
#
#
# 测试
# import random
#
# tag_name = 'python'
# tag = Tag(name=tag_name)
# tags = []
# tags.append(tag)
# page_obj = Page(title='Python orm', page='page10', date=datetime.utcnow())
# page_obj.tags = tags
# db.session.add(page_obj)
# db.session.commit()
#
# python_page = Tag.query.filter_by(name='python').first().pages.first()
# print python_page.title
# # print("tag.pages.all():", tag.pages.all())
#
#
#
#
# obj_id = random.choice(list(range(10)))
#
# tag_name = "tag_" + str(obj_id)
# tag = Tag.query.filter_by(name=tag_name).first()
# print("tag.pages.all(): ", tag.pages.all())
#
# page_title = "page_" + str(obj_id)
# page = Page.query.filter_by(title='page4').first()
# print("page.tags", page.tags)
#
# # new_tag_name = ''.join(random.choice(chars) for _ in list(range(10)))
# # tag_obj = Tag(new_tag_name) # 或者查询出来的某个 Tag 实例。
# # page.tags.append(tag_obj) # 为 page 增加一个 Tag。
# # db.session.commit()
#
# tag = Tag.query.filter_by(name=tag_name).first()
#
#
#
class Users(db.Model):
__tablename__ = 'users'
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String(60))
# addr_id = db.Column(db.Integer, db.ForeignKey('address.id'))
# addresses = db.relationship('Address',
# foreign_keys=[addr_id],
# backref='users'
# )
addresses = db.relationship('Address',
primaryjoin='Address.user_id == Users.id',
backref='users'
)
def __init__(self, name):
self.name = name
def __repr__(self):
return '<Users %r>' % self.name
class Address(db.Model):
__tablename__ = 'address'
id = db.Column(db.Integer, primary_key=True)
email = db.Column(db.String(30))
user_id = db.Column(db.Integer, db.ForeignKey('users.id'))
def __init(self, email):
self.email = email
def __repr__(self):
return '<Address %r>' % self.email
#
if __name__ == '__main__':
# db.drop_all()
# db.create_all()
# # add address
# addr = Address(email='Chan@sina.com')
# # user = Users('Chan')
# user = Users.query.filter_by(name='Chan').first()
# if user is not None:
# user.addresses.append(addr)
# db.session.add(user)
# db.session.commit()
# else:
# print "Not user named 'Chan'"
# get user addresses
user = Users.query.filter_by(name='Chan').first()
if user is not None:
print user.addresses
addr = Address.query.filter_by(email='Chan@sina.com').first()
if addr is not None:
print addr.users