display sum per user elegantly in django

问题

trying to display the final mark per student. But instead of just showing the result of sum , it displays a chunk of query set: for example:

Annie <QuerySet [{'studName': None, 'attendance__sum': 3}, {'studName': 1, 'attendance__sum': 2}, {'studName': 2, 'attendance__sum': 1}]>

and same goes to the rest of the students.

I would like to display it like :

Annie 2

Benny 3

Charlie 4

My view:

def attStudName(request):
    studentName = MarkAtt.objects.all()
    mark = MarkAtt.objects.values('studName').annotate(Sum('attendance'))
    context = {
        'studentName' : studentName,
        'mark' : mark

    }
    return render(request,'show-name.html',context)

My template:

{% for y in mark %}

{% for x in studentName %}  

 <p>{{x.studName}}</p> <p> {{mark}}</p>

 {% endfor %}
{% endfor %}  

How do i display each student name with their own mark accordingly? And how do i display the mark without the

Edited:

Model.py:

class Namelist(models.Model): 
    name = models.CharField(max_length=100)
    program = models.CharField(max_length=10)
    year = models.IntegerField(default=1)
    studType = models.CharField(max_length=15)
    courseType = models.CharField(max_length=15)
    nationality = models.CharField(max_length=20)
    VMSAcc = models.CharField(max_length=30)
    classGrp = models.ForeignKey('GroupInfo', on_delete=models.SET_NULL, null=True)


class MarkAtt(models.Model):
    studName = models.ForeignKey(Namelist,on_delete=models.SET_NULL,blank=True, null=True, default=None)
    classGrp = models.ForeignKey(GroupInfo, on_delete=models.SET_NULL, null=True)
    currentDate = models.DateField(default=now())
    week = models.IntegerField(default=1)
    attendance = models.IntegerField(default=100) #1 is present

Thank you in advance.

回答1:

The below should return a quryset with student names and marks. Two separate queries should not be needed.

students = MarkAtt.objects.values('studName').annotate(mark=Sum('attendance'))

If studName is a ForeignKey do this .values('studName__name')

Then in your context you can just add:

context = {
    students = students
}

You can then loop through students in you template and display data as:

<p>{{x.studName}}</p> <p> {{x.mark}}</p>

回答2:

You are overcomplicating things. Given the following simple context:

students = MarkAtt.objects.values('studName').annotate(mark=Sum('attendance'))
context = {
    'students' : students,
}

you can do in the template:

{% for student in students %}  
    <p>{{student.studName}}</p> <p> {{ student.mark}}</p>
{% endfor %}

来源：https://stackoverflow.com/questions/58008040/display-sum-per-user-elegantly-in-django