class Role(db.Model):__tablename__ = 'roles'

　　id = db.Column(db.Integer,primary_key = True)#...users = db.relationship('User', backref='role', lazy='dynamic')class User(UserMixin, db.Model):__tablename__ = 'users'#...role_id = db.Column(db.Integer, db.ForeignKey('roles.id'))

registrations = db.Table('registrations',db.Column('student_id', db.Integer,        db.ForeignKey('students.id')),
db.Column('class_id', db.Integer, db.ForeignKey('classes.id'))
)
class Student(db.Model):id = db.Column(db.Integer, primary_key=True)name = db.Column(db.String)classes = db.relationship('Class',secondary=registrations,backref=db.backref('students', lazy='dynamic'),lazy='dynamic')
class Class(db.Model):id = db.Column(db.Integer, primary_key = True)name = db.Column(db.String)            

class Follow(db.Model):__tablename__ = 'follows'follower_id = db.Column(db.Integer,db.ForeignKey('users.id'),primary_key = True)followed_id = db.Column(db.Integer,db.ForegnKey('users.id'),primary_key = True)timestamp = db.Column(db.DateTime,default = datetime.utcnow)

class User(UserMixin, db.Model):
# ...followed = db.relationship('Follow',foreign_keys=[Follow.follower_id],backref=db.backref('follower', lazy='joined'),lazy='dynamic',cascade='all, delete-orphan')followers = db.relationship('Follow',foreign_keys=[Follow.followed_id],backref=db.backref('followed', lazy='joined'),lazy='dynamic',cascade='all, delete-orphan')            

 #关注关系的辅助方法def follow(self,user):if not self.is_following(user):f = Follow(follower=self,followed=user)db.session.add(f)def unfollow(self,user):f = self.followed.filter_by(followed_id = user.id).first()if f:db.session.delete(f)def is_following(self,user):return self.followed.filter_by(follow_id = user.id).first() is not Nonedef is_followed(self,user):return self.followers.filter_by(follow_id = user.id).first() is not None

{% extends "base.html" %}
{% import "_macros.html" as macros %}{% block title %}微博 - {{ user.username }}{% endblock %}{% block page_content %}
<div class="page-header"><img class="img-rounded profile-thumbnail" src="{{ user.gravatar(size=256) }}"><div class="profile-header"><h1>{{ user.username }}</h1>{% if user.name or user.location %}<p>{% if user.name %}{{ user.name }}<br>{% endif %}{% if user.location %}From <a href="http://maps.google.com/?q={{ user.location }}">{{ user.location }}</a><br>{% endif %}</p>{% endif %}{% if current_user.is_administrator() %}<p><a href="mailto:{{ user.email }}">{{ user.email }}</a></p>{% endif %}{% if user.about_me %}<p>{{ user.about_me }}</p>{% endif %}<p>创建时间 {{ moment(user.member_since).format('L') }}. 最后访问 {{ moment(user.last_seen).fromNow() }}.</p><p>{{ user.posts.count() }} 博客文章.</p><p>{% if current_user.can(Permission.FOLLOW) and user != current_user %}{% if not current_user.is_following(user) %}<a href="{{ url_for('.follow', username=user.username) }}" class="btn btn-primary">关注</a>{% else %}<a href="{{ url_for('.unfollow', username=user.username) }}" class="btn btn-success">取消关注</a>{% endif %}{% endif %}<a href="{{ url_for('.followers', username=user.username) }}">关注者: <span class="badge">{{ user.followers.count() }}</span></a><a href="{{ url_for('.followed_by', username=user.username) }}">被关注: <span class="badge">{{ user.followed.count() }}</span></a>{% if current_user.is_authenticated and user != current_user and user.is_following(current_user) %}| <span class="label label-default">关注了你</span>{% endif %}</p><p>{% if user == current_user %}<a class="btn btn-default" href="{{ url_for('.edit_profile') }}">编辑个人资料</a>{% endif %}{% if current_user.is_administrator() %}<a class="btn btn-danger" href="{{ url_for('.edit_profile_admin', id=user.id) }}">编辑个人资料 [管理员]</a>{% endif %}</p></div>
</div>
<h3>Posts by {{ user.username }}</h3>
{% include '_posts.html' %}
{% if pagination %}
<div class="pagination">{{ macros.pagination_widget(pagination, '.user', username=user.username) }}
</div>
{% endif %}
{% endblock %}