Django snippets

#save as useradmin.py
from django.utils.safestring import mark_safe
from django.contrib.auth.models import User
from django.contrib.auth.models import Group
from django.contrib import admin

def roles(self):
    #short_name = unicode # function to get group name
    short_name = lambda x:unicode(x)[:1].upper() # first letter of a group
    p = sorted(["<a title='%s'>%s</a>" % (x, short_name(x)) for x in self.groups.all()])
    if self.user_permissions.count(): p += ['+']
    value = ', '.join(p)
    return mark_safe("<nobr>%s</nobr>" % value)
roles.allow_tags = True
roles.short_description = 'roles'

def last(self):
    fmt = "%b %d, %H:%M"
    #fmt = "%Y %b %d, %H:%M:%S"
    value = self.last_login.strftime(fmt)
    return mark_safe("<nobr>%s</nobr>" % value)
last.allow_tags = True
last.admin_order_field = 'last_login'
last.short_description = 'last login'

def adm(self):
    return self.is_superuser
adm.boolean = True
adm.admin_order_field = 'is_superuser'

def staff(self):
    return self.is_staff
staff.boolean = True
staff.admin_order_field = 'is_staff'

User.roles = roles
User.last = last
User.adm = adm
User.staff = staff

UserAdmin = admin.site._registry[User]
UserAdmin.list_display = ['username', 'email', 'first_name', 'last_name'] \
                       + ['is_active', 'staff', 'adm', 'roles', 'last']

#use last few lines only when you have not very much users in each group
def persons(self):
    return ", ".join([x.username for x in self.user_set.all()])

Group.persons = persons

GroupAdmin = admin.site._registry[Group]
GroupAdmin.list_display = ['name', 'persons']