Flask

Question

我尝试从该页面引用另一个页面

<html>
    <head>
    </head>
    <body>
          <header>
              <h1>Restaurants<h1>
          </header>


          {% for i in restaurants %}

          <h5>
              <a href= "*">
                  {{i.name}}
              </a>
            &nbsp &nbsp
              <a href = "*">  Edit </a> &nbsp
              <a href = "*">  Delete  </a>
          </h5>

           {% endfor %}

        <a href = {{url_for('newRestaurant', restaurant_id = restaurant_id)}}> Create new restaurant </a>
    </body>
</html>

这是我管理路由的网络服务器：

from flask import Flask, render_template, request, redirect, url_for, flash
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from database_setup import Base, Restaurant, MenuItem

app = Flask(__name__)

engine = create_engine('sqlite:///restaurantmenu.db')
Base.metadata.bind = engine

DBSession = sessionmaker(bind = engine)
session = DBSession()

# Show all restaurants 
.....

#Create new restaurants
@app.route('/restaurant/<int:restaurant_id>/new', methods = ['GET','POS'])
def newRestaurant(restaurant_id):
    if request.method == 'POST':
        new_Restaurant = Restaurant(name = request.form['new_restaurant_name'], restaurant_id = restaurant_id)
        session.add(new_Restaurant)
        session.commit()
    #return "This page will be for making a new restaurant"
        flash("new restaurant create")
        return redirect(url_for('restaurants', restaurant_id = restaurant_id))
    else:
        return render('newRestaurant.html', restaurant_id = restaurant_id)

我在这里尝试路由到我创建的餐厅页面：

if __name__ == '__main__':
    app.debug = True
    app.run(host='0.0.0.0', port=5000)

Answer 1

您没有在 jinja 模板中向 restaurant_id 发送任何内容：

{{url_for('newRestaurant', restaurant_id = restaurant_id)}}

第二个 restaurant_id 未定义，因为您没有通过它向模板发送任何值。

您应该从 newRestaurant 函数中发送一个号码。

例如（这只是一个简单的例子），您可以验证 Restaurant table 中是否没有行，如果不是，则启动 restaurant_id = 1:

已编辑

@app.route('/restaurant/<int:restaurant_id>', methods = ['GET','POST'])
def newRestaurant(restaurant_id):
    if request.method == 'POST':
        .............
    else:
        restaurants = session.query(Restaurant).all()
        if not restaurants:
            restaurant_id = 1
        else:
            nr_restaurants = session.query(Restaurant).count()
            restaurant_id = int(nr_restaurants) + 1
        return render_template('newRestaurant.html', restaurant_id = restaurant_id)

现在您正在通过 restaurant_id 变量向模板发送一个数字，您可以在那里使用它。

Answer 2

我解决了这个问题，下面是

考虑到我只需要创建一家新餐厅，我不需要在 url 上捕获餐厅的 ID。所以改为像这样路由

@app.route('/restaurant//new', methods = ['GET','POST'])

我像这样删除了 id 部分并删除了 def newRestaurant 函数中的参数

@app.route('/restaurant/new', 方法 = ['GET','POST'])

非常感谢大家提供的线索

Answer 3

当我在我的 deleteMenuItem 定义下添加 restaurant_id=restaurant_id 时它起作用了。

Flask - UndefinedError: 'restaurant_id' is undefined

Flask - UndefinedError: 'restaurant_id' is undefined

python

function

url-routing