Question

我正在尝试运行Flask应用程序，显示书概述页面并能够提交用户的评论。但是我遇到了两个问题：

1）当我尝试运行以下代码时，“ / books / 553803700”的网址将我重定向回首页。

我想

有问题

review = db.execute("SELECT review FROM reviews WHERE review_by = :review_by", {"review_by": current_user}).fetchone()

2）如果我在上面注释该字符串，则页面有效。但是，当我尝试提交评论时，它显示为“未找到。在服务器上找不到所请求的URL。如果您手动输入URL，请检查拼写，然后重试。”

application.py文件：


from flask import Flask, session, render_template, request, redirect, flash, jsonify
from flask_session import Session
from sqlalchemy import create_engine
from sqlalchemy.orm import scoped_session, sessionmaker

....
### some app configuration, other routes
...

@app.route("/books/<isbn>")
def book(isbn):
    try:
        if globals()["session"]["username"]:
            current_user = globals()["session"]["username"]
            book = db.execute("SELECT * FROM books WHERE isbn = :isbn", {"isbn": isbn}).fetchone()

            ### here is that string
            review = db.execute("SELECT review FROM reviews WHERE review_by = :review_by",
                                {"review_by": current_user}).fetchone()

            if review is True:
                return render_template("book.html", book=book, review=review)

            else:
                return render_template("book.html", book=book)


    except:
        return redirect("/login")


@app.route("/books/<isbn>/review", methods=['POST'])
def review(isbn):
    review = request.form.get("review")
    current_user = globals()["session"]["username"]
    db.execute("INSERT INTO reviews (isbn, review_by, review) VALUES (:isbn, :review_by, :review)",
               {"isbn": isbn, "review_by": current_user, "review": review})
    db.commit()
    db.close()
    return redirect("/book/" + isbn)

book.html文件：

{% extends "layout.html" %}

{% block getin %}

    <h1>{{ book.title }}</h1>
    <ul>
        <li>Title: {{ book.title }}</li>
        <li>ISBN: {{ book.isbn }}</li>
        <li>Author: {{ book.author }}</li>
        <li>Year: {{ book.year }}</li>
    </ul>
{% endblock %}

{% block user_info %}
    <h2>Would you like to leave your review?</h2>

    {% if review %}
    <div class="user-review">
    {{ review }}

    </div>

    {% else %}
        <form name="submit-review" action="/book/{{book.isbn}}/review" method="POST">
        <textarea type="text" name="review" class="form-control" placeholder="Leave your review here">
        </textarea>

        <button class="btn btn-primary">Submit</button>
    </form>

    {% endif %}

    <div class="row" style="margin-top:50px">
        GoodReads reviews:
    </div>
{% endblock %}

非常感谢您为解决这两个问题所提供的帮助

Answer 1

要解决第二个错误：

未找到。在服务器上找不到请求的URL。如果你手动输入网址，请检查您的拼写，然后重试。

您需要添加反斜杠/来路由@app.route("/books/<isbn>)。它将类似于：

@app.route("/books/<isbn>/")
def book(isbn):
   #...

Answer 2

看看你的行动的价值。

...
    <form name="submit-review" action="/book/{{book.isbn}}/review" method="POST">
...

让它替换为此：

...
    <form name="submit-review" action="{{ url_for('book', isbn=book.isbn) }}" method="POST">
...

否则，尝试将其删除。

...
    <form name="submit-review" action="" method="POST">
...

Flask应用错误：“在服务器上找不到请求的URL”

2 个答案: