我正在尝试集成PostgreSQL和SQLAlchemy,但SQLAlchemy.create_all()不是从我的模型创建任何表.
我的代码:
from flask import Flask
from flask.ext.sqlalchemy import SQLAlchemy
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'postgresql+psycopg2://login:pass@localhost/flask_app'
db = SQLAlchemy(app)
db.create_all()
db.session.commit()
class User(db.Model):
id = db.Column(db.Integer, primary_key=True)
username = db.Column(db.String(80), unique=True)
email = db.Column(db.String(120), unique=True)
def __init__(self, username, email):
self.username = username
self.email = email
def __repr__(self):
return '<User %r>' % self.username
admin = User('admin', 'admin@example.com')
guest = User('guest', 'guest@example.com')
db.session.add(admin)
db.session.add(guest)
db.session.commit()
users = User.query.all()
print users
但我得到这个错误: sqlalchemy.exc.ProgrammingError: (ProgrammingError) relation "user" does not exist
我怎样才能解决这个问题？
我似乎无法弄清楚为什么我对db.create_all()的调用不起作用.
我有一个包含以下init的应用包:
from flask import Flask
from config import config
from flask.ext.sqlalchemy import SQLAlchemy
# create the database object
db = SQLAlchemy()
# this function is the application factory
def create_app(environment):
app = Flask(__name__)
app.config.from_object(config[environment])
db.init_app(app)
from bp_root import bp_root
from bp_aws import bp_aws
app.register_blueprint(bp_root, url_prefix='/')
app.register_blueprint(bp_aws, url_prefix='/aws')
return app
然后我在app包里面有models.py:
from datetime import datetime
from . import db
class MyTestClass(db.Model):
__tablename__ = 'mytesttable'
id = db.Column(db.Integer, primary_key=True)
email = db.Column(db.String(64), nullable=False, unique=True, index=True)
username = db.Column(db.String(64), nullable=False, unique=True, index=True) …