python - 如何处理从表单中获得的值并使用该值给出结果
问题描述
我正在尝试制作一个测验应用程序，它允许用户回答问题并取回他们的分数，这些问题存储在数据库中。我在取回分数时遇到问题，当我单击提交回答问题时，我得到一个 AttributeError:'NoneType' object has no attribute 'score'
我搜索看看是否有人做了类似的事情，我想到了使用 jquery 来获取用户 ID 和用户输入的值
这是我的 html 页面，用于显示问题和多项选择：
<head>
<!-- Required meta tags -->
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script>window.jQuery || document.write('<script src="{{url_for('static', filename='jquery.js') }}">\x3C/script>')</script>
<script type='text/javascript' src="{{ url_for('static', filename='scoring.js') }}"></script>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.97.0/css/materialize.min.css">
<!-- Compiled and minified JavaScript -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.97.0/js/materialize.min.js"></script>
</style>
<!-- Required for the page -->
<script type='text/javascript'>
//sets the global variable to the prefix to the root of the application
$SCRIPT_ROOT = {{ request.script_root|tojson|safe }};
//Calls the answer checking script with the variable argument
$(document).ready(function() {
$('select').material_select();
$(".button-collapse").sideNav();
startScript({{ current_user.id }}, {{ users[0].score }});
});
</script>
<title>Hello, world!</title>
</head>
<body>
<h5 class="center-align">Answer the Questions</h5>
<form action="http://localhost:5000/info" method='POST'>
{{ form.csrf_token }}
{% for computersystemsq in computersystemsq %}
{% for computersystemsm in computersystemsm %}
<div class="row">
<div class="col s12">
{{ computersystemsq.question }}
</div>
</div>
<div class="{{ computersystemsm.id }}"></div>
<div class="row">
<div class="col s6">
A: {{ computersystemsm.wrong_answer1 }}
</div>
<div class="col s6">
B: {{ computersystemsm.wrong_answer2 }}
</div>
</div>
<div class="row">
<div class="col s6">
C: {{ computersystemsm.answer }}
</div>
</div>
<div class="row">
<div class="input-field col s6">
{{ form.options( class= computersystemsm.id ) }}
<label for="options">Select an Option:</label>
</div>
</div>
<button class="btn waves-effect waves-light" type="submit" id="{{ computersystemsm.id }}">mark</button>
<br>
</div>
{% endfor %}
{% endfor %}
这是为用户提供分数并将该分数存储回数据库的评分代码：
function startScript( current_userId) {
$( document ).ready( readyFunction );
function readyFunction() {
$("button").click( function(event) {
var url = $SCRIPT_ROOT + '/info';
var selectedId = $(this).attr('id');
var selectedValue = $("select." + selectedId).val();
$.getJSON( url, {
id: selectedId,
value: selectedValue,
user_id: current_userId
},
function (data) {
//Doing the checking and all on server side
var scoreElement = document.getElementById("studentusersscore");
scoreElement.text = 'Your SCORE is ' + data.score;
$("." + selectedId).hide(1000);
}
);
event.preventDefault();
});
}
}
这是获取分数并将其存储回用户表中的 url：
@app.route("/info",methods=['POST'])
def info():
id = request.args.get('id',0,type=int)
value = request.args.get('value',0,type=str)
userId = request.args.get('user_id',0,type=int)
presentUser = User.query.get( userId )
presentScore = presentUser.score
computersystemsm=ComputerSystemsMultipleChoices.query.filter( ComputerSystemsMultipleChoices.id == id ).all()
if computersystems[0].answer==value:
presentScore=presentScore + 1
presentUser.score=presentScore
correct=1
else:
presentScore=presentScore -1
presentUser.score=presentScore
correct=0
return jsonify(score = presentScore, correct = correct)
追溯：
AttributeError
AttributeError: 'NoneType' object has no attribute 'score'
Traceback (most recent call last)
File "c:\users\dami\envs\compsci\lib\site-packages\flask\app.py", line 2309, in __call__
return self.wsgi_app(environ, start_response)
File "c:\users\dami\envs\compsci\lib\site-packages\flask\app.py", line 2295, in wsgi_app
response = self.handle_exception(e)
File "c:\users\dami\envs\compsci\lib\site-packages\flask\app.py", line 1741, in handle_exception
reraise(exc_type, exc_value, tb)
File "c:\users\dami\envs\compsci\lib\site-packages\flask\_compat.py", line 35, in reraise
raise value
File "c:\users\dami\envs\compsci\lib\site-packages\flask\app.py", line 2292, in wsgi_app
response = self.full_dispatch_request()
File "c:\users\dami\envs\compsci\lib\site-packages\flask\app.py", line 1815, in full_dispatch_request
rv = self.handle_user_exception(e)
File "c:\users\dami\envs\compsci\lib\site-packages\flask\app.py", line 1718, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "c:\users\dami\envs\compsci\lib\site-packages\flask\_compat.py", line 35, in reraise
raise value
File "c:\users\dami\envs\compsci\lib\site-packages\flask\app.py", line 1813, in full_dispatch_request
self.try_trigger_before_first_request_functions()
try:
request_started.send(self)
rv = self.preprocess_request()
if rv is None:
rv = self.dispatch_request()
except Exception as e:
rv = self.handle_user_exception(e)
return self.finalize_request(rv)
def finalize_request(self, rv, from_error_handler=False):
File "c:\users\dami\envs\compsci\lib\site-packages\flask\app.py", line 1799, in dispatch_request
# request came with the OPTIONS method, reply automatically
if getattr(rule, 'provide_automatic_options', False) \
and req.method == 'OPTIONS':
return self.make_default_options_response()
# otherwise dispatch to the handler for that endpoint
return self.view_functions[rule.endpoint](**req.view_args)
def full_dispatch_request(self):
"""Dispatches the request and on top of that performs request
pre and postprocessing as well as HTTP exception catching and
error handling.
File "C:\Users\Dami\dev\compsci\revision_website\quiz.py", line 358, in info
presentScore = presentUser.score
AttributeError: 'NoneType' object has no attribute 'score'
总的来说，我想要发生的是，每个问题的用户分数都应该返回给他们，并且应该将分数添加到表中，以便为他们做对或做错的每个问题存储。