当我在使用 db.relation 时尝试 "flask db init "或 "flask run "时,我一直收到以下错误。
TypeError: relationship() got an unexpected keyword argument 'query_class'
如果我注释掉db.relation这一行,就能正常工作。
我试图通过使用下面他们的部分文档代码来实现这一点。
import os
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_migrate import Migrate
app = Flask(__name__)
app.config['SECRET_KEY'] = 'mysecretkey'
basedir = os.path.abspath(os.path.dirname(__file__))
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///'+os.path.join(basedir,'data.sqlite')
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
db = SQLAlchemy(app)
Migrate(app,db)
class Person(db.Model):
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String(50), nullable=False)
addresses = db.relationship('Address', backref='person', lazy=True)
class Address(db.Model):
id = db.Column(db.Integer, primary_key=True)
email = db.Column(db.String(120), nullable=False)
person_id = db.Column(db.Integer, db.ForeignKey('person.id'),
nullable=False)
环境: - Flask 1.1.2 - Flask-Migrate 2.5.3 - Flask-SQLAlchemy 2.4.3 - SQLAlchemy 1.3.17 - PyCharm 2020.1.1 - Windows 7。
我设法通过卸载Flask、Flask-Migrate和SQLAlchemy然后重新安装它们来解决这个问题。
#Uninstall
pip uninstall Flask
pip uninstall Flask-Migrate
pip uninstall SQLAlchemy
#Install
pip install Flask
pip install Flask-Migrate
pip install SQLAlchemy