Django live settings with pluggable backends, including Redis.
Project description
Features
Easily migrate your static settings to dynamic settings.
Admin interface to edit the dynamic settings.
Installation
Install from PyPI:
pip install django-constance
Or install the in-development version using pip:
pip install -e git+git://github.com/aleszoulek/django-constance#egg=django-constance
Configuration
Modify your settings.py. Add 'constance' to your INSTALLED_APPS, and move each key you want to turn dynamic into the CONSTANCE_CONFIG section, like this:
INSTALLED_APPS = (
...
'constance',
)
CONSTANCE_CONFIG = {
'MY_SETTINGS_KEY': (42, 'the answer to everything'),
}
Here, 42 is the default value for the key MY_SETTINGS_KEY if it is not found in the backend. The other member of the tuple is a help text the admin will show.
See the Backends section how to setup the backend.
Backends
Constance ships with a series of backends that are used to store the configuration values:
constance.backends.redisd.RedisBackend (default)
The is the default backend and has a couple of options:
CONSTANCE_REDIS_CONNECTION: a dictionary of parameters to pass to the to Redis client, e.g.:
CONSTANCE_REDIS_CONNECTION = { 'host': 'localhost', 'port': 6379, 'db': 0, }CONSTANCE_REDIS_CONNECTION_CLASS (optional): an dotted import path to a connection to use, e.g.:
CONSTANCE_REDIS_CONNECTION_CLASS = 'myproject.myapp.mockup.Connection'
CONSTANCE_REDIS_PREFIX (optional): the prefix to be used for the key when storing in the Redis database. Defaults to 'constance:'. E.g.:
CONSTANCE_REDIS_PREFIX = 'constance:myproject:'
constance.backends.database.DatabaseBackend
If you want to use this backend you need to add 'constance.backends.database' to you INSTALLED_APPS setting.
It also uses django-picklefield to store the values in the database, so you need to install this library, too. E.g.:
pip install django-picklefield
The database backend has the ability to automatically cache the config values and clear them when saving. You need to set the following setting to enable this feature:
CONSTANCE_DATABASE_CACHE_BACKEND = 'memcached://127.0.0.1:11211/'
Usage
Constance can be used from your Python code and from your Django templates.
Python
Accessing the config variables is as easy as importing the config object and accessing the variables with attribute lookups:
from constance import config # ... if config.MY_SETTINGS_KEY == 42: answer_the_question()Django templates
To access the config object from your template, you can either pass the object to the template context:
from django.shortcuts import render_to_response from constance import config def myview(request): return render_to_response('my_template.html', {'config': config})Or you can use the included config context processor.:
TEMPLATE_CONTEXT_PROCESSORS = ( # ... 'constance.context_processors.config', )This will add the config instance to the context of any template rendered with a RequestContext.
Then, in your template you can refer to the config values just as any other variable, e.g.:
<h1>Welcome on {% config.SITE_NAME %}</h1> {% if config.BETA_LAUNCHED %} Woohoo! Head over <a href="/sekrit/">here</a> to use the beta. {% else %} Sadly we haven't launched yet, click <a href="/newsletter/">here</a> to signup for our newletter. {% endif %}
Editing
Fire up your admin and you should see a new app called Constance with MY_SETTINGS_KEY in the Config pseudo model.
Screenshots
The standard edit screen.
The virtual application Constance among your regular applications.
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