Question

I am new to python and I am using django for student database application .
Student database application must show id, firstname,lastname,subjectnames,marks.
Single student is having multiple subjects and their marks.
I am getting problem with accessing multiple values that student is having multiple subjects and marks.

models.py

class Person(models.Model):
    firstname=models.CharField(max_length=50)
    lastname=models.CharField(max_length=50)

    def __unicode__(self):
        return (self.firstname,self.lastname)


class Marksheet(models.Model):
    subname=models.CharField(max_length=50)
    marks=models.IntegerField(max_length=10)
    person=models.ForeignKey(Person)

    def __unicode__(self):
        return self.subname

views.py

def add_page(request,page_name): # function for creating  the new records
    p1=None
    p2=None
    if request.method=='POST':
        p1=Person(firstname=request.POST['firstname'],lastname=request.POST['lastname'])
        p1.save()
        p2=Marksheet(subname=request.POST.getlist('subnames'),person=Person(person_id))
        p2.save()
    return render_to_response("add.html",{"page_name":page_name})

creating a records I am using form in html which is shown below….

Templates
add.html

<form method="post" action="/newdcl/{{page_name}}/add/" > {% csrf_token %}
    First name:  <input type="text" name="firstname" /> <br />
    Last name:  <input type="text" name="lastname" /> <br /> 
    Operating System  <input value="os" name="subnames" type="checkbox"><br />
    System Programming <input value="sp" name="subnames" type="checkbox"> <br />
    Maths <input value="maths" name="subnames" type="checkbox"> <br />        
    <input type="submit" value="save" >
</form> 

Can anyone help me in this????

Answer 1

Your problem seems to lie in your how you try to create Marksheet, you can’t assign a list of values to one field like that.
Using your currently formless, scary, no-validation, setup… you can do something like this-

p1=Person(firstname=request.POST['firstname'], 
          lastname=request.POST['lastname'])
p1.save()
for subname in request.POST.getlist('subnames'):
    new = MarkSheet(subname=subname, person=p1) 
        #no data for marks, must define it to be able to be blank/null
    new.save()

You will need to add blank=True, null=True to you marks field in your models.py if you intend to not have any initial mark.

Please look at Making Queries and Forms