appending some string into a list in database using django

Question

i having a problem in appending some string into a list in database please help me

here is my models.py

class friendList(models.TextField):
    myFriend = []
class friend(models.Model):
    username = models.CharField(max_length="30")
    friends = friendList().myFriend

and this is view.py

def addfriend(request):
    try:
        user = request.session['user']
        if request.method == 'POST':
            friend.objects.filter(username = user.username)[0].friends.append(request.POST['user_name'])
        return HttpResponse("ok he/she is your friend now!!")
    except:
        return render(request, 'login.html', {'error':"you are not logged in"})

I think that all your friend instances ('friend' must be uppercase) are sharing class variable myFirned of fieldList class. — Leandro
– Leandro, Commented Jul 3, 2013 at 12:14
i used this print friend.objects.filter(username = user.username)[0].friends before return HttpResponse and it was ok but in my db it wont saved — Sina
– Sina, Commented Jul 3, 2013 at 12:17

Burhan Khalid · Accepted Answer · 2013-07-03 12:22:43Z

You need to fix your models. Since a friend can have many friends, each of which is an object of type Friend, you can add a ForeignKey to the same model:

class Friend(models.Model):
    username = models.CharField(max_length="30")
    friends = models.ForeignKey('self')

The convention in Python is to have InitialCaps (also called CamelCase) for class names

Now, in your view:

from django.contrib import messages
from django.shortcuts import redirect
from django.contrib.auth.decorators import login_required

@login_required
def addfriend(request):
    if request.method == 'POST':
        the_user = Friend.objects.get(username=request.user.username)
        the_friend = Friend.objects.get(username=request.POST['user_name'])
        the_user.friends_set.add(the_friend)
        messages.add_message(request, messages.INFO, 'Friend added!')
        return redirect('/index')
    else:
        messages.add_message(request, messages.ERROR, 'No friend selected!')
        return redirect('/index')

For POST requests, you should always redirect. Here I am using the redirect shortcut to redirect the user back to the index page (you can change the URL to redirect them to anywhere else).

Django provides a messages framework which I am using to display messages to the user; the documentation will show you how to add code to your templates to show the messages.

Finally, the login_required decorator is a way to make sure that a view is only accessible if a user is logged in. It is part of the built-in authentication framework.

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