與sqlalchemy的神祕錯誤：TypeError'用戶'對象不可調用

我想創建一個簡單的應用程序使用燒瓶和sqlalchemy鏈接到MySQL數據庫。我在我的數據庫中創建了一個包含一些虛擬數據的用戶表，並試圖在我的/ api路由上測試一個示例查詢。我不斷收到內部服務器錯誤，而且我的生活無法弄清楚發生了什麼。我以前製作過類似的應用程序，它從來沒有給我這個奇怪的錯誤。堆棧跟蹤如下：與sqlalchemy的神祕錯誤：TypeError'用戶'對象不可調用

2016-12-02 22:15:16,079 - app - ERROR - Exception on /api [GET] 
    Traceback (most recent call last): 
     File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1988, in wsgi_app 
     response = self.full_dispatch_request() 
     File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1642, in full_dispatch_request 
     response = self.make_response(rv) 
     File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1746, in make_response 
     rv = self.response_class.force_type(rv, request.environ) 
     File "/usr/local/lib/python2.7/dist-packages/werkzeug/wrappers.py", line 847, in force_type 
     response = BaseResponse(*_run_wsgi_app(response, environ)) 
     File "/usr/local/lib/python2.7/dist-packages/werkzeug/wrappers.py", line 57, in _run_wsgi_app 
     return _run_wsgi_app(*args) 
     File "/usr/local/lib/python2.7/dist-packages/werkzeug/test.py", line 871, in run_wsgi_app 
     app_rv = app(environ, start_response) 
    TypeError: 'User' object is not callable

app.py

from flask import Flask 
from database.models import User 
from sqlalchemy.orm import sessionmaker, scoped_session 
from sqlalchemy import create_engine 

engine = create_engine('mysql://root:[email protected]/testdb', convert_unicode=True) 

Session = sessionmaker(autocommit=False, autoflush=False, bind=engine) 

# Create a scoped session 
ssession = scoped_session(Session) 

app = Flask(__name__) 


# Setup our error logging 
if app.debug is not True: 
    import logging 
    from logging.handlers import RotatingFileHandler 
    file_handler = RotatingFileHandler('errors.log', maxBytes=1024 * 1024 * 100, backupCount=20) 
    file_handler.setLevel(logging.ERROR) 
    formatter = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s") 
    file_handler.setFormatter(formatter) 
    app.logger.addHandler(file_handler) 


@app.route('/') 
def index(): 
    return 'hello world' 


@app.route('/api') 
def api_route(): 
    # Error is happening right here 
    return ssession.query(User).first() 


if __name__ == '__main__': 
    app.run(debug=False)

數據庫/ models.py

from datetime import datetime 
from sqlalchemy.ext.declarative import declarative_base 
from sqlalchemy import Column, Integer, String, BLOB, \ 
    DateTime, ForeignKey 

Base = declarative_base() 

class User(Base): 
    __tablename__ = 'User' 

    id = Column(Integer, primary_key=True) 
    email = Column(String(64), unique=True) 
    password = Column(String(255)) 
    join_date = Column(DateTime) 
    last_login = Column(DateTime) 
    login_count = Column(Integer, default=0) 
    name = Column(String(128), default=None) 
    location = Column(String(128), default=None) 
    points = Column(Integer, default=0) 
    num_posts = Column(Integer, default=0) 

    def __init__(self, email, password): 
     self.email = email 
     self.password = password 
     self.join_date = datetime.utcnow() 
     self.last_login = datetime.utcnow() 

    def __repr__(self): 
     return '<User %r>' % self.email

我完全不知道自己爲什麼這是不工作 - 如果我導入所有必要的模塊，它實際上在python控制檯中工作得很好！任何見解都會很棒。

來源

2016-12-02 Jesse Bartola

return ssession.query(User).first()

您試圖返回一個不允許的用戶對象。您將需要返回不同的類型。作爲一個非常簡單的例子，下面將返回用戶的電子郵件。

return ssession.query(User).first()['email']

您可能想要返回用戶的JSON表示，爲此我會考慮Flask-Marshmallow。

來源

2016-12-03 13:34:23

與sqlalchemy的神祕錯誤：TypeError'用戶'對象不可調用

回答

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