mirror of
https://github.com/django/django.git
synced 2024-12-29 12:36:08 +00:00
7f2b36050e
git-svn-id: http://code.djangoproject.com/svn/django/trunk@14482 bcc190cf-cafb-0310-a4f2-bffc1f526a37
78 lines
3.3 KiB
Plaintext
78 lines
3.3 KiB
Plaintext
FAQ: Using Django
|
|
=================
|
|
|
|
Why do I get an error about importing DJANGO_SETTINGS_MODULE?
|
|
-------------------------------------------------------------
|
|
|
|
Make sure that:
|
|
|
|
* The environment variable DJANGO_SETTINGS_MODULE is set to a
|
|
fully-qualified Python module (i.e. "mysite.settings").
|
|
|
|
* Said module is on ``sys.path`` (``import mysite.settings`` should work).
|
|
|
|
* The module doesn't contain syntax errors (of course).
|
|
|
|
* If you're using mod_python but *not* using Django's request handler,
|
|
you'll need to work around a mod_python bug related to the use of
|
|
``SetEnv``; before you import anything from Django you'll need to do
|
|
the following::
|
|
|
|
os.environ.update(req.subprocess_env)
|
|
|
|
(where ``req`` is the mod_python request object).
|
|
|
|
I can't stand your template language. Do I have to use it?
|
|
----------------------------------------------------------
|
|
|
|
We happen to think our template engine is the best thing since chunky bacon,
|
|
but we recognize that choosing a template language runs close to religion.
|
|
There's nothing about Django that requires using the template language, so
|
|
if you're attached to ZPT, Cheetah, or whatever, feel free to use those.
|
|
|
|
Do I have to use your model/database layer?
|
|
-------------------------------------------
|
|
|
|
Nope. Just like the template system, the model/database layer is decoupled from
|
|
the rest of the framework.
|
|
|
|
The one exception is: If you use a different database library, you won't get to
|
|
use Django's automatically-generated admin site. That app is coupled to the
|
|
Django database layer.
|
|
|
|
How do I use image and file fields?
|
|
-----------------------------------
|
|
|
|
Using a :class:`~django.db.models.FileField` or an
|
|
:class:`~django.db.models.ImageField` in a model takes a few steps:
|
|
|
|
#. In your settings file, you'll need to define :setting:`MEDIA_ROOT` as
|
|
the full path to a directory where you'd like Django to store uploaded
|
|
files. (For performance, these files are not stored in the database.)
|
|
Define :setting:`MEDIA_URL` as the base public URL of that directory.
|
|
Make sure that this directory is writable by the Web server's user
|
|
account.
|
|
|
|
#. Add the :class:`~django.db.models.FileField` or
|
|
:class:`~django.db.models.ImageField` to your model, making sure to
|
|
define the :attr:`~django.db.models.FileField.upload_to` option to tell
|
|
Django to which subdirectory of :setting:`MEDIA_ROOT` it should upload
|
|
files.
|
|
|
|
#. All that will be stored in your database is a path to the file
|
|
(relative to :setting:`MEDIA_ROOT`). You'll most likely want to use the
|
|
convenience :attr:`~django.core.files.File.url` attribute provided by
|
|
Django. For example, if your :class:`~django.db.models.ImageField` is
|
|
called ``mug_shot``, you can get the absolute path to your image in a
|
|
template with ``{{ object.mug_shot.url }}``.
|
|
|
|
How do I make a variable available to all my templates?
|
|
-------------------------------------------------------
|
|
|
|
Sometimes your templates just all need the same thing. A common example would
|
|
be dynamically-generated menus. At first glance, it seems logical to simply
|
|
add a common dictionary to the template context.
|
|
|
|
The correct solution is to use a ``RequestContext``. Details on how to do this
|
|
are here: :ref:`subclassing-context-requestcontext`.
|