Question

我正在建立一个系统，用户可以向另一个用户发出请求，而其他用户可以接受该请求。我希望该请求包含来自users表和我的请求表的数据。

我的用户表和用户请求设置了多对多的数据库关系

SentRequests = db.Table('sentrequests',
                        db.Column('user_origin', db.Integer, db.ForeignKey('requests.user_origin')),
                        db.Column('users', db.Integer, db.ForeignKey('users.id')))

RecievedRequests = db.Table('recievedrequests',
                            db.Column('user_destination', db.Integer, db.ForeignKey('requests.user_destination')),
                            db.Column('users', db.Integer, db.ForeignKey('users.id')))


class Users(db.Model):
    __tablename__ = 'users'
    email = db.Column(db.String(120), unique=True, index=True)
    id = db.Column(db.Integer, primary_key=True)
    password = db.Column(db.Text)
    firstname = db.Column(db.String(120))
    lastname = db.Column(db.String(120))
    type = db.Column(db.String(10))
    active = db.Column(db.Boolean)
    address = db.Column(db.Text)
    latitude = db.Column(db.Float)
    longitude = db.Column(db.Float)
    uid = db.Column(db.Text(64), unique=True)
    requests = db.relationship('Requests', secondary='recievedrequests', lazy='dynamic', backref=db.backref('getusers', lazy='dynamic'))
    # group_id = db.Column(db.Integer)

    def __init__(self, email, password, firstname, lastname, utype, uid, active=True):
        self.password = password
        self.firstname = firstname
        self.lastname = lastname
        self.email = email
        self.type = utype
        self.active = active
        self.uid = uid

    @property
    def is_active(self):
        return self.active

    @property
    def is_authenticated(self):
        return True

    @property
    def is_anonymous(self):
        return True

    def get_id(self):
        return unicode(self.id)

    def __repr__(self):
        return '<Users %r>' % self.email


class Requests(db.Model):
    __tablename__ = 'requests'
    id = db.Column(db.Integer, primary_key=True)
    user_origin = db.Column(db.Integer)
    user_destination = db.Column(db.Integer)
    message = db.Column(db.Unicode)
    accepted = db.Column(db.Boolean)
    users = db.relationship('Users', secondary='sentrequests', lazy='dynamic', backref=db.backref('getrequests', lazy='dynamic'))

    def __init__(self, user_origin, user_destination, accepted=False):
        self.user_origin = user_origin
        self.user_destination = user_destination
        self.accepted = accepted

现在我像这样查询请求表。从我在一小时左右的时间里看到如何做我想做的事情，看起来这是错误的做法。我尝试了.join()，但这只是让查询返回None结果

requests = Requests.query.filter_by(user_destination=current_user.id).all()
return render_template('dashboard.html', requests=requests)

我的目标是在模板上我可以从用户表中获取firstname和lastname以及来自请求的消息。

{% for req in requests %}
    <p>{{ req.users.firstname }} {{ req.users.lastname }}</p>
    <p>{{ req.message }}</p>
{% endfor %}

Flask SQLAlchemy从关系中获取数据

0 个答案: