django-在查询集中的字段中添加模型中不存在的字段

Question

I have a model that reads from a pre-existing university database. The username is stored as the students id. I'm not able to add a new column to the database in a save or I could use a save function in my model.

class Student(models.Model):
        student_id = models.IntegerField(db_column = 'Student_ID', primary_key = True)
        statusid = models.IntegerField(db_column = 'StatusID')
        fname = models.CharField(db_column = 'Student_First_Name', max_length = 35)
        lname = models.CharField(db_column = 'Student_Last_Name_Formatted' , max_length = 40)



        class Meta:
            managed = False
            db_table = '[Student]'

What i'm trying to do is take the username in a query and match it up with another field that is umich.edu/student_id as a primary key.

I'm defining the request in one function as:

def user_list(request):
    student = Student.objects.all()

passing in the argument for students to my template with a POST to the form.

In my next view that gets posted

def criteria(request):
    user = request.POST.get('student_id')
    print(user)
    student = CourseCriteria.objects.get(universitystudentid = request.POST.get('student_id'))

My print/post of user is coming through correctly as the student id, but I need to prepend umich.edu/ to the student_id in the queryset. How can I accomplish this without being able to add that field to my model?

Answer 1

I am not sure to understand your problem, I suppose that it is not as simple as:

def criteria(request):
    user = request.POST.get('student_id')
    student = CourseCriteria.objects.get(universitystudentid='umich.edu/%s'%user)