Here is my code

I am working on student management project and I am unable to get the branch for student as it is foreignkey of Course model to Student model and I want to get the selected option into student model in branch row

models.py

class Course(models.Model):
    id=models.AutoField(primary_key=True)
    course = models.CharField(max_length=50)
    course_code = models.BigIntegerField(null=True)
    
    def __str__(self):
        return self.course

class Student(models.Model):
    id=models.AutoField(primary_key=True)
    user=models.OneToOneField(User,on_delete=models.CASCADE)
    branch=models.ForeignKey(Course,on_delete=models.CASCADE,null=True,blank=True)
    middle_name=models.CharField(max_length=50,null=True)
    roll_no=models.IntegerField()
    mobile_no=PhoneNumberField(default='')
    parents_mobile_no=PhoneNumberField(default='')
    division=models.CharField(max_length=10,null=True)
    batch=models.CharField(max_length=10,null=True)
    
    def __str__(self):
        return self.user.first_name   " "   self.user.last_name

views.py

def studentregister(request):
    if request.method == 'POST':
        first_name = request.POST['first_name']
        middle_name = request.POST['middle_name']
        last_name = request.POST['last_name']
        email = request.POST['email']
        branch= request.POST['branch']
        division = request.POST['division']       
        roll_no = request.POST['roll_no']
        mobile_no = request.POST['mobile_no']
        parents_mobile_no = request.POST['parents_mobile_no']
        pass1 = request.POST['password']
        pass2 = request.POST['confirmpassword']
        
        if pass1 == pass2 :
            if User.objects.filter(email=email).exists():
                return HttpResponse('User already exsits')
            else:
                user = User.objects.create_user(email=email, password=pass1, first_name=first_name, last_name=last_name)
                user.save();
                studentdetails = Student ( user=user, middle_name=middle_name,roll_no=roll_no,mobile_no=mobile_no,parents_mobile_no=parents_mobile_no, branch=branch,division=division)
                studentdetails.save();
                return render (request, 'ms/homepage/index.html')
        else:
            return HttpResponse('password does not match')
    else:
        return HttpResponse('failed')

def staffstudent(request):
    if request.user.is_authenticated and request.user.user_type==3:
        courses = Course.objects.all()
        return render(request, 'ms/staff/student.html',{'courses':courses})
    else:
        return render(request,'ms/login/login.html')

html file as student.py

<form action="studentregister" method="POST" style = "background-color:#011B3C;">
            {% csrf_token %}
<div  name="branch">
            <select >
                <option selected disabled="true">Branch</option>
                {% for course in courses%}
                <option>{{course.course}}</option>
                {%endfor%}
            </select>
            </div> 
</form>

The error I am getting is MultiValueDictKeyError at /staff/studentregister 'branch'

Please help me with this as soon as possible

CodePudding user response：

You haven't named that <select> (<select name="branch">) so any choice you make in it will not be transmitted to the server, and that's why you get a key error.

In addition, the <option>'s value must be the course's id:

<option value="{{ course.id }}">{{ course.course }}</option>

... so you can look it up in the view:

branch = Course.objects.get(id=request.POST['branch'])

However, please look at Django's built-in forms functionality, especially model forms – you would be done in a fraction of the HTML and Python code you have now, plus you'd actually have correct data validation.

CodePudding user response：

this is not the conventional way to deal with Forms in Django although it can be done. Convention would be:

creating a form in forms.py like so:

class MyForm(forms.Form):

dropdown_one = forms.ChoiceField(
    label="Country",
    widget=forms.Select(attrs={"class": "selecter form-control"}),
    choices=[],
)
dropdown_two = forms.ChoiceField(
    label="Category",
    widget=forms.Select(attrs={"class": "selecter form-control"}),
    choices=[(None, '...')],
    required=True

)

then use this form in views.py like so:

my_form = MyForm(initial={})
return render(request,{'my_form':my_form})

then finally in html file :

        {{my_form.media}}
        {% for item in my_form %}
        <div  id="dropdown-content">
          {{item.label_tag}}
          {{item}}
        </div>
        {% endfor %}  
      </div>

Hope this Helps. For more refer to this : https://docs.djangoproject.com/en/4.0/topics/forms/