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我正在设置一个烧瓶应用程序来运行匿名在线实验。如何通过current_user登录管理器的对象跟踪匿名参与者？

当用户匿名时，current_user设置为AnonymousUserMixin. 我试图分配AnonymousUserMixin一个 id 变量（例如通过 uuid.uuid4() ），current_user=None但它不再是 ORM 对象。我试图遵循这篇文章的第二个答案的建议（如何使用 Flask 跟踪匿名用户），但我缺乏如何将所描述的方式转换为实际代码的知识。

所以我最终得到了错误消息“AnonymousUserMixin”对象没有属性“_sa_instance_state”，我似乎无法解决。

关于如何current_user与匿名用户一起使用该对象的任何建议？

这里有一些相关的代码部分[编辑：代码根据@Roch的建议进行了调整]：

模型.py

from website import db


# models for database structure
class DemographicData(db.Model):
    __tablename__ = 'demographic_data'
    id = db.Column(db.Integer, primary_key=True)
    gender = db.Column(db.String(1), nullable=False)
    age = db.Column(db.Integer, nullable=False)
    nationality = db.Column(db.String(50), nullable=False)
    # create relationships to the other models to link them to the demographicData
    consentRequest = db.relationship('ModalData', backref='participant_bref', lazy=True)


    def __repr__(self):
        return f"demographicData('{self.id}', '{self.gender}', '{self.age}', '{self.nationality}')"


class ModalData(db.Model):
    __tablename__ = 'modal_data'
    id = db.Column(db.Integer, primary_key=True)
    participantId = db.Column(db.Integer, db.ForeignKey('demographic_data.id'), nullable=False)
    consent = db.Column(db.String(3), nullable=False)

    def __repr__(self):
        return f"modalData('{self.participantId}', '{self.consent}')"

路线.py

from flask import render_template, url_for, redirect, request, session
from website import app, db
from website.models import DemographicData, ModalData
from website.questionnaires import DemographicsForm



@app.before_request
def make_session_permanent():
    session.permanent = True



# route to demographic information form
@app.route("/demographics", methods=['GET', 'POST'])
def demographics():
    form = DemographicsForm()
    if form.validate_on_submit():
        participant = DemographicData(gender=form.gender.data,
                                      age=form.age.data,
                                      nationality=form.nationality.data)
        session['anonymous_user_id'] = participant.id
        # save to database
        db.session.add(participant)
        db.session.commit()
        return redirect(url_for('megazine')) 
    return render_template('demographics.html', title='Demographic Information', form=form)



# route to a website I want to redirect to after demographics
@app.route("/megazine", methods=['GET', 'POST'])
def megazine():
    if request.method == 'POST':
        consentDecision = ModalData(participant_bref=session['anonymous_user_id'],
                                    consent=request.form['consentForm'])
        db.session.add(consentDecision)
        db.session.commit()
        return redirect(url_for('motivemag'))
    return render_template('/newswebsite_templates/megazine/index.html', title='Megazine')
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1 回答 1

2

您想在会话期间还是会话之后跟踪用户？

如果您需要在匿名用户使用您的应用程序期间保留他的一些数据，您可以轻松使用 Flask 会话： http: //flask.pocoo.org/docs/1.0/api/#flask.session

from flask import session

@app.route('/my_url1')
def my_view1():
    data = None
    if session.new:
         # ... do something like save data in the session
         session['foo'] = 'bar'
    # ... do something like read data in the session
    data = session['foo']
    return render_template('/my_template.html', data=data)

如果您希望在会话结束后保留​​用户的数据，我认为合乎逻辑的做法是动态创建用户并记录他。

from flask import session    
from models import User

@app.route('/my_url1')
def my_view1():
    data = None
    if session.new:
         user = User()
         session['anonymous_user_id'] = user.id
    else:
         user = User.query.get(session['anonymous_user_id'])
    # ... do whatever you like
于 2019-02-05T14:00:58.533 回答