我的Flask登录有问题。每次我尝试登录时，我都会出现以下错误：
AttributeError: type object 'User' has no attribute 'get'
我不知道这是从哪里来的，因为我使用的是烧瓶文档中推荐的代码。这是代码：
from flask import Flask, escape, request, render_template, redirect, url_for
from flask_sqlalchemy import SQLAlchemy
from datetime import datetime
from flask_login import UserMixin, login_manager, login_user, login_required, logout_user, current_user, LoginManager
from flask_wtf import FlaskForm
from flask_wtf.form import FlaskForm
from flask_wtf.recaptcha import validators
from wtforms import StringField, PasswordField, SubmitField
from wtforms.validators import InputRequired, Length, ValidationError
from flask_bcrypt import Bcrypt
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///data_task.db'
db = SQLAlchemy(app)
app.config['SECRET_KEY'] = "HEXODECICUL"
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
bcrypt = Bcrypt(app)
login_manager = LoginManager()
login_manager.init_app(app)
login_manager.login_view = "login"
class User(db.Model, UserMixin):
id = db.Column(db.Integer, primary_key=True)
username = db.Column(db.String(20), nullable=False, unique=True)
password = db.Column(db.String(80), nullable=False)
class RegisterForm(FlaskForm):
username = StringField(validators=[InputRequired(), Length(min=4, max=20)], render_kw={"placeholder": "Username"})
password = PasswordField(validators=[InputRequired(), Length(min=4, max=20)], render_kw={"placeholder": "Password"})
submit = SubmitField("Register")
def validate_username(self, username):
existing_usernames = User.query.filter_by(username=username.data).first()
if existing_usernames:
raise ValidationError("That username alreadu exists. Please choose a different one.")
class LoginForm(FlaskForm):
username = StringField(validators=[InputRequired(), Length(min=4, max=20)], render_kw={"placeholder": "Username"})
password = PasswordField(validators=[InputRequired(), Length(min=4, max=20)], render_kw={"placeholder": "Username"})
submit = SubmitField("Login")
@app.route('/dash', methods=['GET', 'POST'])
@login_required
def dash():
return render_template("index.html")
@app.route("/login", methods=["GET", "POST"])
def login():
form = LoginForm()
if form.validate_on_submit():
user = User.query.filter_by(username=form.username.data).first()
if user:
if bcrypt.check_password_hash(user.password, form.password.data):
login_user(user)
return redirect(url_for('dash'))
return render_template("login.html", form = form)
@app.route("/logout")
@login_required
def logout():
logout_user()
return redirect(url_for('login'))
@app.route("/register", methods=['GET', 'POST'])
def register():
form = RegisterForm()
if form.validate_on_submit():
hashed_password = bcrypt.generate_password_hash(form.password.data)
new_user = User(username=form.username.data, password=hashed_password)
db.session.add(new_user)
db.session.commit()
return redirect(url_for('login'))
return render_template("register.html", form=form)
@app.route('/', methods=["GET", "POST"])
def accueil():
return "Home"
if __name__ == '__main__':
app.run(debug=True)
烧瓶中的错误：
AttributeError
AttributeError: type object 'User' has no attribute 'get'
Traceback (most recent call last)
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/flask/app.py", line 2091, in __call__
def __call__(self, environ: dict, start_response: t.Callable) -> t.Any:
"""The WSGI server calls the Flask application object as the
WSGI application. This calls :meth:`wsgi_app`, which can be
wrapped to apply middleware.
"""
return self.wsgi_app(environ, start_response)
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/flask/app.py", line 2076, in wsgi_app
response = self.handle_exception(e)
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/flask/app.py", line 2073, in wsgi_app
response = self.full_dispatch_request()
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/flask/app.py", line 1518, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/flask/app.py", line 1516, in full_dispatch_request
rv = self.dispatch_request()Open an interactive python shell in this frame
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/flask/app.py", line 1502, in dispatch_request
return self.ensure_sync(self.view_functions[rule.endpoint])(**req.view_args)
File "/Users/christophechouinard/Feuille_encaisse/app.py", line 69, in login
return render_template("login.html", form = form)
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/flask/templating.py", line 146, in render_template
ctx.app.update_template_context(context)
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/flask/app.py", line 756, in update_template_context
context.update(func())
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/flask_login/utils.py", line 379, in _user_context_processor
return dict(current_user=_get_user())
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/flask_login/utils.py", line 346, in _get_user
current_app.login_manager._load_user()
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/flask_login/login_manager.py", line 318, in _load_user
user = self._user_callback(user_id)
File "/Users/christophechouinard/Feuille_encaisse/app.py", line 52, in load_user
password = PasswordField(validators=[InputRequired(), Length(min=4, max=20)], render_kw={"placeholder": "Username"})
submit = SubmitField("Login")
@login_manager.user_loader
def load_user(user_id):
return User.get(user_id)
@app.route('/dash', methods=['GET', 'POST'])
@login_required
def dash():
return render_template("index.html")
AttributeError: type object 'User' has no attribute 'get'
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我知道这个问题已经在这里得到了回答：https://stackoverflow.com/questions/ask#:~：text=AttributeError%3A%20type%20object%20%27Message，pack((%20display.update((/20def%20……但我尝试过了，仍然得到了这个错误(我对这个问题的答案不太了解…(
非常感谢！！
查看您的用户加载程序。在其中，您调用User.get(user_id)。但是，案文应如下。
@login_manager.user_loader
def load_user(user_id):
return User.query.get(user_id)
通过这些行，SQLAlchemy用于根据用户在数据库中的id查询用户。