Flask中同一路由中不同类型的POST请求

Question

我想在我的网站上有一个页面，其中有多个按钮可以发送不同的 POST 请求来修改我的数据库的某些部分。

目前，只有顶部的 if 语句被执行。如果我尝试下面的两个，我得到：浏览器（或代理）发送了一个该服务器无法理解的请求。

如果我切换它们，它总是最上面的 if 语句被执行。

我这样做错了吗？有没有更好的方法来做这种事情？

@app.route('/', methods=["GET", "POST"])
@login_required
def homepage():
    if request.method == "POST" and request.form['estimatedCost']:
        _projectName = request.form['projectName']
        _estimatedCost = request.form['estimatedCost']
        _amountAllocated = request.form['amountAllocated']
        conn, cursor = connectDB()
        cursor.execute("INSERT INTO `project` (`name`, `estimatedCost`, `amountAllocated`, `pStatus`, `actualCost`, `estimatedDuration`, `actualDuration`, `costDifference`) VALUES ( '" + _projectName + "', '" + _estimatedCost + "', '" + _amountAllocated + "', 'NOT STARTED', 0, 0, 0, NULL)")
        conn.commit()
        conn.close()
        return redirect('/')
    if request.method == "POST" and request.form['delete']:
        _delete = request.form['delete']
        conn, cursor = connectDB()
        cursor.execute("DELETE FROM project WHERE name = '" + _delete + "'")
        conn.commit()
        conn.close()
        return redirect('/')
    if request.method == "POST" and request.form['pid']:
        _pid = request.form['pid']
        _status = request.form['status']
        conn, cursor = connectDB()
        cursor.execute("UPDATE project SET pStatus = '" + _status + "' WHERE name = '" + _pid + "'")
        conn.commit()
        conn.close()
        return redirect('/')
    conn, cursor = connectDB()
    cursor.execute("SELECT * FROM project")
    projects = cursor.fetchall()
    conn.close()
    return render_template("dashboard.html", projectDic = projects)

Answer 1

我设法为我的问题找到了解决方案。

因为request.form['key']如果它不存在就会导致错误，而不是仅仅变成 False，它使页面崩溃。

相反，我过去常常"key" in request.form检查该输入是否已填写在表单中。

这是更正后的代码：

@app.route('/', methods=["GET", "POST"])
@login_required
def homepage():
    if request.method == "POST" and "estimatedCost" in request.form:
        _projectName = request.form['projectName']
        _estimatedCost = request.form['estimatedCost']
        _amountAllocated = request.form['amountAllocated']
        conn, cursor = connectDB()
        cursor.execute("INSERT INTO `project` (`name`, `estimatedCost`, `amountAllocated`, `pStatus`, `actualCost`, `estimatedDuration`, `actualDuration`, `costDifference`) VALUES ( '" + _projectName + "', '" + _estimatedCost + "', '" + _amountAllocated + "', 'NOT STARTED', 0, 0, 0, NULL)")
        conn.commit()
        conn.close()
        return redirect('/')
    if request.method == "POST" and "delete" in request.form:
        _delete = request.form['delete']
        conn, cursor = connectDB()
        cursor.execute("DELETE FROM project WHERE name = '" + _delete + "'")
        conn.commit()
        conn.close()
        return redirect('/')
    if request.method == "POST" and "pid" in request.form:
        _pid = request.form['pid']
        _status = request.form['status']
        conn, cursor = connectDB()
        cursor.execute("UPDATE project SET pStatus = '" + _status + "' WHERE name = '" + _pid + "'")
        conn.commit()
        conn.close()
        return redirect('/')
    conn, cursor = connectDB()
    cursor.execute("SELECT * FROM project")
    projects = cursor.fetchall()
    conn.close()
    return render_template("dashboard.html", projectDic = projects)