如何将多个课程保存到学生表中。我想保留我的设计。这个代码不是通过AddStudentForm保存多个字段(课程)。它返回一个带有课程变量的错误。如果我使用CharField而不是ManyToManyField在课程模型中然后代码完美地工作,但是当我使用ManyToManyField然后它不起作用。当我使用form.errors时,它会抛出课程。如果我没有使用form.errors,那么它不会给出任何错误,也不会保存数据。
如何将多个课程保存到学生表中。我想保持我的设计。这个代码不是通过AddStudentForm保存多个字段(课程)。它返回一个带有课程变量的错误。
models.朋友
class Course(models.Model):
title = models.CharField(max_length=250)
price = models.IntegerField(default=0)
duration = models.CharField(max_length=50)
def __str__(self):
return self.title
class Student(models.Model):
name = models.CharField(max_length=100)
courses = models.ManyToManyField(Course)
email = models.EmailField()
image = models.ImageField(upload_to='Students',blank=True)
def __str__(self):
return self.name
forms.朋友
class AddStudentForm(forms.ModelForm):
# courses = forms.ModelMultipleChoiceField(widget=forms.CheckboxSelectMultiple, queryset=Course.objects.all())
class Meta:
model = Student
fields = ['name','courses','email','image']
def __init__(self, *args, **kwargs):
super(AddStudentForm, self).__init__(*args, **kwargs)
self.fields["courses"].widget = CheckboxSelectMultiple()
self.fields["courses"].queryset = Course.objects.all()
views.朋友
def addstudent(request):
courses = Course.objects.all()
if request.method == 'POST':
form = AddStudentForm(request.POST,request.FILES)
if form.is_valid():
student = form.save(commit=False)
course = form.cleaned_data['courses']
student.courses = course
student.save()
# student.courses.add(course)
# student.save_m2m()
# student.courses.set(course) # this method also didn't helped me
messages.success(request, 'student with name {} added.'.format(student.name))
return redirect('students:add_student')
else:
# messages.error(request,'Error in form.Try again')
return HttpResponse(form.errors) # this block is called and returns courses
else:
form = AddStudentForm()
return render(request,'students/add_student.html',{'form':form,'courses':courses})
add_student.html
<form action="{% url 'students:add_student' %}"
method="post"
enctype="multipart/form-data">
{% csrf_token %}
<div class="form-group">
<h5>Full Name <span class="text-danger">*</span>
</h5>
<div class="controls">
<input type="text" name="name" class="form-
control" > </div>
</div>
<div class="form-group">
<h5>Courses<span class="text-danger">*</span>
</h5>
<div class="controls">
{% for course in courses %}
<input name ="courses" type="checkbox" id="course-
{{course.id}}" value="{{course.title}}">
<label for="course-{{course.id}}">{{course.title}}
</label>
{% endfor %} # i think the problem is here.
</div>
</div>
<div class="form-group">
<h5>Email <span class="text-danger">*</span></h5>
<div class="controls">
<input type="text" name="email" class="form-
control" required> </div>
</div>
</div>
<div class="form-group">
<h5>Image <span class="text-danger">*</span></h5>
<div class="controls">
<input type="file" name="image" class="form-control" > </div>
</div>
<div class="text-xs-right">
<button type="submit" class="btn btn-info">Add</button>
</div>
</form>
You can set commit=True .
if form.is_valid():
student = form.save(commit=True)
student.save()
在分配m2m之前需要先保存,系统需要学生模型的主键才能插入m2m表。
if form.is_valid():
student = form.save(commit=False)
course = form.cleaned_data['courses']
student.save()
# this will save by it self
student.courses.set(*course)