Question

I am trying to count the number of objects with have a foreign key relationship to another object, and which have the flag deleted=0.

User‘s have a foreignkey relationship to Accounts in the models:

class Account(models.Model):
    ...
    def __unicode__(self):
        return self.organisation

class User(models.Model):
    ...
    account = models.ForeignKey("Account", null=True, blank=True)
    deleted = models.BooleanField(blank=False)

In the views, for each account I would like to show the number of users who are attached to the account, which also have deleted=0.

Here’s the best I could do:

@login_required
def accounts(request):
    try:
        accounts = Account.objects.all().filter(deleted=0)
        users = User.objects.all().filter(deleted=0)
    except:
        raise Http404

    account_users = {'a':'a'}
    for account in accounts:
        account_users[account.id] = User.objects.all().filter(deleted=0).filter(account = account.id)

    variables = RequestContext(request, {
    'accounts':accounts,
    'users':users,
    'account_users':account_users,
    })
    return render_to_response('accounts/accounts.html', variables)

In the above, I’m using a dictionary which contains account.id => non-deleted user count. The problem with this is I can’t iterate over the dictionary key in the template…

Thanks for any help.

Answer 1

To iterate over dictionary use items() method. It returns a iterator over (key, value) pairs.

for k, v in dictionary.items():
   do_something_with(k,v)