python - Flask : sqlalchemy. exc.ProgrammingError : (psycopg2. ProgrammingError)关系 "users"不存在

Question

我正在开发一个基于 http://code.tutsplus.com/tutorials/intro-to-flask-signing-in-and-out--net-29982 的 flask 应用程序.

作为 tut 的一部分，我正在尝试连接到 postgres 服务器，其结构如屏幕截图所示。我添加了一个您可以看到的数据库“ flask ”。

基于 tut，我的主文件('routes.py')中有以下代码:

from flask.ext.sqlalchemy import SQLAlchemy

from flask import Flask

app = Flask(__name__)

app.config['SQLALCHEMY_DATABASE_URI'] = "postgresql://postgres:123@localhost/flask"

db = SQLAlchemy(app)
from models import User
# db.init_app(app)
db.create_all()
db.session.commit()


admin = User('admin', 'admin@example.com', 'admin1', 'admin1@example.com')
guest = User('admi2', 'admin@ex1ample.com', 'admin', 'admin2@example.com')
# guest = User('guest', 'guest@example.com')
db.session.add(admin)
db.session.add(guest)
db.session.commit()

模型.py:

from flask.ext.sqlalchemy import SQLAlchemy
from werkzeug import generate_password_hash, check_password_hash

db = SQLAlchemy()

class User(db.Model):
  __tablename__ = 'users'
  uid = db.Column(db.Integer, primary_key = True)
  firstname = db.Column(db.String(100))
  lastname = db.Column(db.String(100))
  email = db.Column(db.String(120), unique=True)
  pwdhash = db.Column(db.String(54))

  def __init__(self, firstname, lastname, email, password):
    self.firstname = firstname.title()
    self.lastname = lastname.title()
    self.email = email.lower()
    self.set_password(password)

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

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

当运行调试器时给出:

sqlalchemy.exc.ProgrammingError: (psycopg2.ProgrammingError) relation "users" does not exist
LINE 1: INSERT INTO users (firstname, lastname, email, pwdhash) VALU...
                    ^
 [SQL: 'INSERT INTO users (firstname, lastname, email, pwdhash) VALUES (%(firstname)s, %(lastname)s, %(email)s, %(pwdhash)s) RETURNING users.uid'] [parameters: {'lastname': 'Admin@Example.Com', 'firstname': 'Admin', 'pwdhash': 'pbkdf2:sha1:1000$eZvJNKHO$64f59c34364e3d6094d126fa3ca2b327ab39e302', 'email': 'admin1'}]

我做错了什么？

Answer 1

你正在初始化你的数据库两次。

我建议好好看看这个:http://flask.pocoo.org/docs/0.10/patterns/sqlalchemy/

从本质上讲，您需要将文件拆分成更多的文件，以防止出现导入问题并使文件更加整洁。我已经完成了以下似乎有效的操作。请注意，我使用的是 SQLite，因为我没有在此机器上安装 Postgres。

应用.py

from flask import Flask
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:////test11.db'

模型.py

from flask.ext.sqlalchemy import SQLAlchemy
from app import app
db = SQLAlchemy(app)

class User(db.Model):
    __tablename__ = 'users'
    uid = db.Column(db.Integer, primary_key = True)
    firstname = db.Column(db.String(100))
    lastname = db.Column(db.String(100))
    email = db.Column(db.String(120), unique=True)
    pwdhash = db.Column(db.String(54))

    def __init__(self, firstname, lastname, email, password):
        self.firstname = firstname.title()
        self.lastname = lastname.title()
        self.email = email.lower()
        self.set_password(password)

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

    def check_password(self, password):
        return password

路线.py

from models import User, db

db.create_all()
db.session.commit()

admin = User('admin', 'admin@example.com', 'admin1', 'admin1@example.com')
guest = User('admi2', 'admin@ex1ample.com', 'admin', 'admin2@example.com')
db.session.add(admin)
db.session.add(guest)
db.session.commit()

我绝对建议您查看一些教程!您将需要它:您应该了解 Web 漏洞、最佳实践等。