CS50 Finance "Buy" 函数未返回正确的错误

Question

我正在尝试实现 flask 代码的购买功能，作为测试，我正在尝试让我目前在购买功能中使用的两个错误代码起作用。但是，无论我在表单中输入什么，我总是会返回到错误页面，指出 "Must Provide Username" 并且我不确定它是如何到达那个点而不是我的两个错误条件之一。

到目前为止，这是我的购买功能：

@app.route("/buy", methods=["GET", "POST"])
@login_required
def buy():
    """Buy shares of stock"""
    # requested_quote = stock
    if request.method == "POST":
        if not request.form.get("symbol"):
            return apology("must provide symbol", 403)
        if not request.form.get("amount") or request.form.get("amount") < 1:
            return apology("Please enter amount 1 or greater", 403)

        stock = request.form.get("symbol")
        amount = request.form.get("amount")
        requested_quote = lookup(request.form.get("quote"))
        cash = db.execute("SELECT cash FROM users WHERE id = :id", session["user_id"])

        if requested_quote == None:
            return apology ("Invalid Symbol", 400)
        if (requested_quote["price"] * amount) > cash:
            return apology("Not enough funds", 400)
        else:
             db.execute("INSERT INTO purchases (id, symbol, amount, share_price) VALUES(?, ?, ?, ?)",
             (session["user_id"], stock, amount, requested_quote["price"]))
    else:
        return render_template("buy.html")

这是登录功能，它包含在作业的分发代码中，我认为可能与我的问题有关

@app.route("/login", methods=["GET", "POST"])
def login():
    """Log user in"""

    # Forget any user_id
    session.clear()

    # User reached route via POST (as by submitting a form via POST)
    if request.method == "POST":

        # Ensure username was submitted
        if not request.form.get("username"):
            return apology("must provide username", 403)

        # Ensure password was submitted
        elif not request.form.get("password"):
            return apology("must provide password", 403)

        # Query database for username
        rows = db.execute("SELECT * FROM users WHERE username = :username",
                          username=request.form.get("username"))

        # Ensure username exists and password is correct
        if len(rows) != 1 or not check_password_hash(rows[0]["hash"], request.form.get("password")):
            return apology("invalid username and/or password", 403)

        # Remember which user has logged in
        session["user_id"] = rows[0]["id"]

        # Redirect user to home page
        return redirect("/")

    # User reached route via GET (as by clicking a link or via redirect)
    else:
        return render_template("login.html")

还有这个：

def login_required(f):
    """
    Decorate routes to require login.

    http://flask.pocoo.org/docs/1.0/patterns/viewdecorators/
    """
    @wraps(f)
    def decorated_function(*args, **kwargs):
        if session.get("user_id") is None:
            return redirect("/login")
        return f(*args, **kwargs)
    return decorated_function

任何帮助将不胜感激！

Answer 1

您可以在执行 flask run 的终端中查看 flask 日志。它很可能表明购买路线根本没有被调用。检查 buy.html 中表单元素的 action 属性。也许 login.html 被复制到 buy.html 作为起点，并且该属性从未更改过。

CS50 Finance "Buy" 函数未返回正确的错误

CS50 Finance "Buy" Function not returning correct error

flask

cs50