Assuming you have django installed, the first step is to install django-tenant-schemas.
pip install django-tenant-schemas
You’ll have to make the following modifcations to your settings.py file.
Your DATABASE_ENGINE setting needs to be changed to
DATABASES = {
'default': {
'ENGINE': 'tenant_schemas.postgresql_backend',
# ..
}
}
Add the middleware tenant_schemas.middleware.TenantMiddleware to the top of MIDDLEWARE_CLASSES, so that each request can be set to use the correct schema.
MIDDLEWARE_CLASSES = (
'tenant_schemas.middleware.TenantMiddleware',
#...
)
Make sure you have django.core.context_processors.request listed under TEMPLATE_CONTEXT_PROCESSORS else the tenant will not be available at request.
TEMPLATE_CONTEXT_PROCESSORS = (
'django.core.context_processors.request',
#...
)
Now we have to create your tenant model. To allow the flexibility of having any data in you want in your tenant, we have a mixin called TenantMixin which you have to inherit from. This Mixin only has two fields (domain_url and schema_name) and both are required. Here’s an example, suppose we have an app named customers and we want to create a model called Client.
from django.db import models
from tenant_schemas.models import TenantMixin
class Client(TenantMixin):
name = models.CharField(max_length=100)
paid_until = models.DateField()
on_trial = models.BooleanField()
created_on = models.DateField(auto_now_add=True)
# default true, schema will be automatically created and synced when it is saved
auto_create_schema = True
This app supports South so if you haven’t configured it yet and would like to:
For Django 1.1 or below
SOUTH_DATABASE_ADAPTER = 'south.db.postgresql_psycopg2'
For Django 1.2 or above
SOUTH_DATABASE_ADAPTERS = {
'default': 'south.db.postgresql_psycopg2',
}
You can list south under TENANT_APPS and SHARED_APPS if you want.
We override south‘s syncdb and migrate command, so you’ll need to change your INSTALLED_APPS to
INSTALLED_APPS = SHARED_APPS + TENANT_APPS + ('tenant_schemas',)
This makes sure tenant_schemas is the last on the list and therefore always has precedence when running an overriden command.
Default: | 'public' |
---|
The schema name that will be treated as public, that is, where the SHARED_APPS will be installed.
Default: | 'True' |
---|
Sets if the models will be synced directly to the last version and all migration subsequently faked. Useful in the cases where migrations can not be faked and need to be ran individually. Be aware that setting this to False may significantly slow down the process of creating tenants. Only relevant if South is used.
Default: | None |
---|
We have a goodie called PUBLIC_SCHEMA_URLCONF. Suppose you have your main website at example.com and a customer at customer.example.com. You probably want your user to be routed to different views when someone requests http://example.com/ and http://customer.example.com/. Because django only uses the string after the host name, this would be impossible, both would call the view at /. This is where PUBLIC_SCHEMA_URLCONF comes in handy. If set, when the public schema is being requested, the value of this variable will be used instead of ROOT_URLCONF. So for example, if you have
PUBLIC_SCHEMA_URLCONF = 'myproject.urls_public'
When requesting the view /login/ from the public tenant (your main website), it will search for this path on PUBLIC_SCHEMA_URLCONF instead of ROOT_URLCONF.
In some cases using the PUBLIC_SCHEMA_URLCONF can be difficult. For example, Django CMS takes some control over the default Django URL routing by using middlewares that do not play well with the tenants. Another example would be when some apps on the main website need different settings than the tenants website. In these cases it is much simpler if you just run the main website example.com as a separate application.
If your projects are ran using a WSGI configuration, this can be done by creating a filed called wsgi_main_website.py in the same folder as wsgi.py.
# wsgi_main_website.py
import os
os.environ.setdefault("DJANGO_SETTINGS_MODULE", "project.settings_public")
from django.core.wsgi import get_wsgi_application
application = get_wsgi_application()
If you put this in the same Django project, you can make a new settings_public.py which points to a different urls_public.py. This has the advantage that you can use the same apps that you use for your tenant websites.
Or you can create a completely separate project for the main website, but be aware that if you specify a PostgreSQL database in the DATABASES setting in settings.py, Django will use its default public schema as described in the PostgreSQL documentation.
Here’s how you can configure your Apache server to route all subdomains to your django project so you don’t have to setup any subdomains manually.
<VirtualHost 127.0.0.1:8080>
ServerName mywebsite.com
ServerAlias *.mywebsite.com mywebsite.com
WSGIScriptAlias / "/path/to/django/scripts/mywebsite.wsgi"
</VirtualHost>
Django’s Deployment with Apache and mod_wsgi might interest you too.