django-fsm adds declarative states managment for django models. Instead of adding some state field to a django model, and manage it values by hand, you could use FSMState field and mark model methods with transition decorator that will perform checks and switch state field value on succed model method call.
$ python setup.py install
Or, for the latest git version
$ pip install -e git://github.com/kmmbvnr/django-fsm.git#egg=django-fsm
Add FSMState field to you model from django_fsm.db.fields import FSMField, transition
class BlogPost(models.Model):
state = FSMField(default='new')
Use transition decorator to annotate model methods
@transition(source='new', target='published')
def publish(self):
"""
Some additional code goes here
"""
source parameter accepts a list of states, or an individual state.
You can use '*' for source, to allow the switching to target from any state
Succeed call of the publish() method will change the state field
from django_fsm.db.fields import can_proceed
def publish_view(request, post_id):
post = get_object__or_404(BlogPost, pk=post_id)
if not can_proceed(post.publish):
raise Http404;
post.publish()
post.save()
return redirect('/')
If you store the states in the db table you could use FSMKeyField to enshure Foreign Key database integrity.