使用带有postgres的flask sqlalchemy更新状态将不会提交到数据库

Question

我已经阅读了很多文档，但看不到这些行有什么问题

update_this = User.query.filter_by(email=email).first()
update_this.emailconfirmed = True
db.session.commit()

...但是当我部署布尔列“ emailconfirmed”时，永远不会更新为True。 在上面显示的代码中，我已经用打印语句确认了update_this.emailconfirmed为False……我似乎无法更新该值。 有人知道我可以做哪些测试，应该检查哪些进口等。

现在，这是我的主.py文件的顶部，上面的代码出现在此文件中

from flask import Flask, render_template, request, session, redirect, url_for, make_response
# the following line imports from models.py
from models import db, User
# the following line imports SignupForm from forms.py
from forms import SignupForm, LoginForm
from flask_mail import Mail, Message
from itsdangerous import URLSafeTimedSerializer

# Production (causes Heroku to redirect to SSL)
from flask_sslify import SSLify
from flask_sqlalchemy import SQLAlchemy


import os
app = Flask(__name__)
sslify = SSLify(app)
sslify = SSLify(app, subdomains=True)
app.config.from_pyfile('config_file.cfg')
app.config['SQLALCHEMY_DATABASE_URI'] = os.environ['DATABASE_URL']
db = SQLAlchemy(app)
mail = Mail(app)
ts = URLSafeTimedSerializer(app.config['SECRET_KEY'], salt=app.config['SALT'])

这是我的models.py文件

from flask_sqlalchemy import SQLAlchemy
from werkzeug import generate_password_hash, check_password_hash


db = SQLAlchemy()

class User(db.Model):
    __tablename__ = 'users'
    id = db.Column(db.Integer, primary_key=True)
    firstname = db.Column(db.String(100))
    lastname = db.Column(db.String(100))
    role = db.Column(db.String(20))
    roleapproved = db.Column(db.Boolean)
    school = db.Column(db.String(100))
    email = db.Column(db.String(120), unique=True)
    emailconfirmed = db.Column(db.Boolean)
    pwdhash = db.Column(db.String(100))


    def __init__(self, firstname, lastname, role, school, email, password):
        self.firstname = firstname.title()
        self.lastname = lastname.title()
        self.role = role.lower()
        if role.lower() == 'student':
            self.roleapproved = True
        if role.lower() == 'teacher':
            self.roleapproved = False
        self.school = school.title()
        self.email = email.lower()
        self.set_password(password)
        self.emailconfirmed = False

    def set_password(self, password):
        self.pwdhash = generate_password_hash(password)

    def check_password(self, password):
        return check_password_hash(self.pwdhash, password)

    def __repr__(self):
        return '<User {0}>'.format(self.email)

任何帮助我做上面提到的更新将不胜感激！

Answer 1

理想情况下，您希望在整个应用程序生命周期中维护一个会话。 这样，就可以轻松进行推理，并且可以避免将会话绑定到各个模型。

谢谢@Ilja Everila

在main.py ，您不必编写SQLAlchemy ，而应编写，

db.init_app(app)

为您的用户模型定义一个save实例方法。

 def save(self): """Saves model object instance """ db.session.add(self) db.session.commit() 

您可以调用此方法将实例另存为

 update_this.save() 

更新实体的另一种方法是在提交之前获取特定的对象会话

 from sqlachemy.orm import session ... session = session.object_session(update_this) session.commit()