python - 试图在 STUDENT 模型(外键)中保存 POST 数据 CLASS NAME?
问题描述
我正在尝试在页面上以表单形式显示类。当点击注册按钮时,我得到班级名称并将其分配给学生模型(它有一个班级模型的外键)..
更新:
新错误:/enrol/ 处的 ValueError 无法分配“'guitar101'”:“StudentProfile.student_class”必须是“MusicClass”实例。
- django新手我不知道我在做什么,请帮忙!我的尝试,有什么问题?
模型.py
class StudentProfile(models.Model):
user = models.OneToOneField('Accounts', related_name='student_profile')
student_class = models.ForeignKey(to=MusicClass, related_name="student_class", null=True, blank=True)
is_student = models.BooleanField('student status', default=True)
# more fields
class MusicClass(models.Model):
class_name = models.CharField(max_length=500, blank=True)
# more fields
视图.py
# enrolls student
def studentEnrol(request):
if request.method == "POST":
musicClass = request.POST.get('musicClass', '')
student_profile = StudentProfile(student_class=musicClass)
student_profile.save()
return HttpResponseRedirect('/')
else:
querySet = MusicClass.objects.all()
args = {'classes': querySet }
return render(request, 'accounts/enrol.html', args)
表格.py
class MusicClassesEnrolForm(forms.ModelForm):
class Meta:
model = MusicClass
fields = ('class_name', 'class_level', 'class_time', 'class_room', 'instrument_taught', 'day', 'teacher')
注册.html
{% extends 'base.html' %}
{% block body %}
<div class="outer"><div class="container">
<h1> Enrol into Class </h1>
<table style="width:100%">
<tr>
<th>Class Name</th>
<th>Instrument</th>
<th>Class Level</th>
<th>Time</th>
<th>Teacher</th>
<th>Room</th>
<th>Register</th>
</tr><br>
{% for class in classes %}
<tr>
<td>{{ class.class_name }}</td>
<td>{{ class.instrument_taught }}</td>
<td>{{ class.class_level }}</td>
<td>{{ class.class_time }}</td>
<td>{{ class.teacher }}</td>
<td>{{ class.class_room }}</td>
<td><form method="post">
{% csrf_token %}
<input type="hidden" name="musicClass" value="{{ class.class_name }}">
<input type="submit" name="enrolBtn" value="Enrol">
</form></td>
</tr>
{% endfor %}
<table>
</p>
</div>
</div>
{% include "footer.html" %}
{% endblock %}
请问有什么想法吗?
更新 - 添加了回溯
Environment:
Request Method: POST
Request URL: http://127.0.0.1:8000/enrol/
Django Version: 1.11.7
Python Version: 3.6.5
Installed Applications:
['accounts',
'timetable',
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware']
Traceback:
File "C:\Users\N9587268\AppData\Local\Programs\Python\Python36-32\lib\site-packages\django\core\handlers\exception.py" in inner
41. response = get_response(request)
File "C:\Users\N9587268\AppData\Local\Programs\Python\Python36-32\lib\site-packages\django\core\handlers\base.py" in _get_response
187. response = self.process_exception_by_middleware(e, request)
File "C:\Users\N9587268\AppData\Local\Programs\Python\Python36-32\lib\site-packages\django\core\handlers\base.py" in _get_response
185. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "D:\ifb299\webrepo\musicwebsite\website\accounts\views.py" in studentEnrol
127. StudentProfile = StudentProfile(student_class=musicClass)
Exception Type: UnboundLocalError at /enrol/
Exception Value: local variable 'StudentProfile' referenced before assignment
请求信息 POST(例如,这是我在单击注册 btn 时从帖子中获得的信息)
csrfmiddlewaretoken
'TY28RiLjhtu98v8uthXFuCGJ4pPO3z6e02IDa6x8UFujenzEZdECunhxuqcAKtCw'
musicClass
'guitar101'
enrolBtn
'Enrol'
解决方案
现在您尝试将 a 分配给不正确string
的字段。ForeignKey
获取后musicClass = request.POST.get('musicClass', '')
,您应该拥有或MusicClass
使用它创建一个实例
# @login_required # A login decorator is very important here
def studentEnrol(request):
user = request.user
if not hasattr(user,'student_profile'):
# The current user doesn't have student_profile attribute
# redirect to the page you want
return redirect('completeProfile') # for instance
student_profile = request.user.student_profile
if request.method == "POST":
id_musicClass = request.POST.get('musicClass')
music_class = MusicClass.objects.get(id=id_musicClass)
# or music_class = get_object_or_404(MusicClass,id=id_musicClass)
student_profile.student_class = music_class
student_profile.save()
return HttpResponseRedirect('/')
else:
'''rest of the codes'''
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