Question

我已经在Heroku上成功部署了Flask / PostgreSQL Web应用程序。它应该由两页组成。第二页应打开。但是，我得到的是标题中描述的错误。

这是我的第一个Web应用程序。我在哪里以及如何查找错误？感谢您的任何帮助。

    ```from flask import Flask, render_template, request
    from flask_sqlalchemy import SQLAlchemy
    from send_email import send_email
    from sqlalchemy.sql import func
    
     
    app=Flask(__name__)
    # app.config['SQLALCHEMY_DATABASE_URI']='postgresql://postgres:***@localhost/height_collector'
    app.config['SQLALCHEMY_DATABASE_URI']='postgres://noiilxmwxinrrz:3ebb4e8e5f6002a4340466bcfba5272dd491dbafbc04aa3523154c1ffc10936b@ec2-52-86-73-86.compute-1.amazonaws.com:5432/db1dr24ra03kco?sslmode=require'
    db=SQLAlchemy(app)
     
    class Data(db.Model):
        __tablename__="data"
        id=db.Column(db.Integer, primary_key=True)
        email_=db.Column(db.String(120), unique=True)
        height_=db.Column(db.Integer)
     
        def __init__(self, email_, height_):
            self.email_=email_
            self.height_=height_
     
    @app.route("/")
    def index():
        return render_template("index.html")
      
    @app.route("/success", methods=['POST'])
    def success():
        if request.method=='POST':
            email=request.form["email_name"]
            height=request.form["height_name"]
            if db.session.query(Data).filter(Data.email_==email).count() == 0:
                data=Data(email,height) 
                db.init_app(app)
                db.session.add(data)
                db.session.commit()
                average_height=db.session.query(func.avg(Data.height_)).scalar()
                average_height=round(average_height,1)
                count=db.session.query(Data.height_).count()
                send_email(email,height,average_height,count)
                return render_template("success.html")
        return render_template('index.html',
        text="Seems like we've got something from that email address already!")
     
    if __name__ == '__main__':
        app.debug=True
        app.run()

from email.mime.text import MIMEText
import smtplib

def send_email(email, height,average_height,count):
    from_email="***.com"
    from_password="***"
    to_email=email 

    subject="Height data"
    message="Hey there, your height is <strong>%s</strong> cm. <br> Average height of all is <strong>%s</strong> cm, and that is calculated out of <strong>%s</strong> of people. <br> Thanks! " % (height, average_height, count)

    msg=MIMEText(message, 'html')
    msg['Subject']=subject
    msg['To']=to_email
    msg['From']=from_email

    gmail=smtplib.SMTP('smtp.gmail.com',587)
    gmail.ehlo()
    gmail.starttls()
    gmail.login(from_email, from_password)
    gmail.send_message(msg) ```

Image of Heroku log output

Answer 1

一个问题是成功路线上未启用GET方法。
因此将其更改为：

@app.route("/success", methods=['GET','POST'])

另一个问题是您尚未安装psycopg2模块。您需要在requirements.txt文件中进行此操作。

if db.session.query(Data).filter(Data.email_==email).count() == 0:语句的评估结果为False时，您也不会呈现模板。

可能还有其他问题。

如何使用Flask / Heroku修复500内部错误？

1 个答案: