Best way to install django-achievements is to user pip :
pip install django-achievements
of course you can also download it directly from PyPi (http://pypi.python.org/pypi/django-achievements) and install it :
python setup.py install
Then to install it on your Django project just add, ‘achievements‘ to your INSTALLED_APPS and synchronize your database with it. If you’re using South, you need to execute django-achievements‘s migrations :
./manage.py syncdb # or with south : ./manage.py syncdb --migrate
And just with that, you’re all set to create your first achievement.
Create your first achievement¶
To create your first achievement, you only need to create a Python class with the following attributes :
- key (unique) : the key string of your achievement, it’s what will be used to identify uniquely your achievement.
- name : The full name of your achievement
- description : The full description of what your achievement is all about
- bonus : the bonus (integer) associated to unlocking this achievement
- evaluate(args): the evaluate function is a callback that must return a boolean in order to decide if the achievement has been unlocked.
Here is an example of Achievement definition :
class UsernameAchievement(object): name = "Username achivement" key = "username" description = "Handles when a user changes its username" bonus = 15.0 def evaluate(self, user, *args, **kwargs): if create_username_from_email(user.email) != user.username: return True else: return False
The name of class must end with the string Achievement, this is in order to be able to define more than just Achievements classes into a given file.
Register it to the Engine¶
To register it into the engine just use the ‘ACHIEVEMENT_CLASSES‘ attribute in your settings like that :
#============================================================================== # Achievements conf #============================================================================== ACHIEVEMENT_CLASSES = ['accounts.handlers', 'backend.handlers']
The file where the classes are defined are not important, but try to avoid conflicts of naming by avoiding to use the name achievements.py. When you have defined a new achievement, for the engine to create the proper objects into your database, execute :
./manage.py syncdb # or if you're using south : ./manage.py migrate achievements
This step is mandatory when you’re creating new achievement classes and when you update their properties.
Check it when you need¶
The engine now is aware of the achievements you want to handle. On startup it will create the achievements objects into your database, and store the path to the callback you want to associate it with.
Now the engine’s running on startup of your application and you need a way to call it for it to check if given a precise context an achievement will be unlocked. Here’s how you’ll call it :
from achievements.engine import engine engine.check_achievement(user=my_current_user, key="achievement_key")
Of course my_current_user can be a User object you extracted from database or your common request.user.
Don’t hesitate to check achievements even for anonymous users, it won’t be taken into account anyway.
The achievement key is the most important part as it will tell the engine with callback to call and if you have other arguments your achievement may need to evaluate, given the context if the achievement has been unlocked, you can pass them as optional arguments, they will be transmitted to the Achievement class.
Achievements includes a handy middleware class for automatic achievement checks.
Register the middleware class in your settings as usual :
MIDDLEWARE_CLASSES += ['achievements.middleware.AutoAchievementChecker']
Define the http request methods (get, post, put, delete) on which the automatic middleware checker should be run :
# for example check on changing http request methods only ACHIEVEMENT_MIDDLEWARE_REQUEST_METHODS = ['post', 'put', 'delete']
Get the score of any user¶
It may be useful (or vital) to get at anytime a user’s score given the achievements he may have unlocked, here’s the way to do that :
from achievements.utils import get_user_score score = get_user_score(request.user)
Handle the score yourself¶
If by any chance you want to add the score to your User profile, or just want to trigger a notification when the user has unlocked a new achievement, you can connect to the dedicated signal achievement_unlocked :
# first define your callback : def update_score(sender, user, achievement, *args, **kwargs): print "Gotcha" # then connect it to the django signal : from achievements.signals import achievement_unlocked achievement_unlocked.connect(update_score)
To use Celery, we assume you have installed the django-celery app, and you just need to set this attribute in your settings, and you don’t have to change anything to your code :
ACHIEVEMENT_USE_CELERY = True
This attribute is false by default.