552 lines
24 KiB
Plaintext
552 lines
24 KiB
Plaintext
==========
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Django FAQ
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==========
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General questions
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=================
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Why does this project exist?
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----------------------------
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Django grew from a very practical need: World Online, a newspaper Web
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operation, is responsible for building intensive Web applications on journalism
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deadlines. In the fast-paced newsroom, World Online often has only a matter of
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hours to take a complicated Web application from concept to public launch.
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At the same time, the World Online Web developers have consistently been
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perfectionists when it comes to following best practices of Web development.
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Thus, Django was designed not only to allow fast Web development, but
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*best-practice* Web development.
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Django would not be possible without a whole host of open-source projects --
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`Apache`_, `Python`_, and `PostgreSQL`_ to name a few -- and we're thrilled to
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be able to give something back to the open-source community.
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.. _Apache: http://httpd.apache.org/
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.. _Python: http://www.python.org/
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.. _PostgreSQL: http://www.postgresql.org/
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What does "Django" mean, and how do you pronounce it?
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-----------------------------------------------------
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Django is named after `Django Reinhardt`_, a gypsy jazz guitarist from the 1930s
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to early 1950s. To this day, he's considered one of the best guitarists of all time.
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Listen to his music. You'll like it.
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Django is pronounced **JANG**-oh. Rhymes with FANG-oh.
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.. _Django Reinhardt: http://en.wikipedia.org/wiki/Django_Reinhardt
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Is Django stable?
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-----------------
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Yes. World Online has been using Django for more than two years. Sites built on
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Django have weathered traffic spikes of over one million hits an hour and at
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least one Slashdotting. Yes, it's quite stable.
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Does Django scale?
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------------------
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Yes. Compared to development time, hardware is cheap, and so Django is
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designed to take advantage of as much hardware as you can throw at it.
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Django uses a "shared-nothing" architecture, which means you can add hardware
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at any level -- database servers, caching servers or Web/application servers.
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The framework cleanly separates components such as its database layer and
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application layer. And it ships with a simple-yet-powerful `cache framework`_.
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.. _`cache framework`: http://www.djangoproject.com/documentation/cache/
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Who's behind this?
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------------------
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Django was developed at `World Online`_, the Web department of a newspaper in
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Lawrence, Kansas, USA.
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`Adrian Holovaty`_
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Adrian is a Web developer with a background in journalism. He was lead
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developer at World Online for 2.5 years, during which time Django was
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developed and implemented on World Online's sites. Now he works for
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washingtonpost.com building rich, database-backed information sites, and
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continues to oversee Django development. He likes playing guitar (Django
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Reinhardt style) and hacking on side projects such as `chicagocrime.org`_.
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He lives in Chicago.
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On IRC, Adrian goes by ``adrian_h``.
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`Jacob Kaplan-Moss`_
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Jacob is a whipper-snapper from California who spends equal time coding and
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cooking. He's lead developer at World Online and actively hacks on various
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cool side projects. He's contributed to the Python-ObjC bindings and was
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the first guy to figure out how to write Tivo apps in Python. Lately he's
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been messing with Python on the PSP. He lives in Lawrence, Kansas.
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On IRC, Jacob goes by ``jacobkm``.
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`Simon Willison`_
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Simon is a well-respected Web developer from England. He had a one-year
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internship at World Online, during which time he and Adrian developed
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Django from scratch. The most enthusiastic Brit you'll ever meet, he's
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passionate about best practices in Web development and has maintained a
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well-read Web-development blog for years at http://simon.incutio.com.
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He works for Yahoo UK, where he managed to score the title "Hacker Liason."
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He lives in London.
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On IRC, Simon goes by ``SimonW``.
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`Wilson Miner`_
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Wilson's design-fu makes us all look like rock stars. When not sneaking
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into apartment complex swimming pools, he's the Commercial Development
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Director for World Online, which means he makes the money that pays all our
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paychecks. He lives in Lawrence, Kansas.
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On IRC, Wilson goes by ``wilsonian``.
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.. _`World Online`: http://code.djangoproject.com/wiki/WorldOnline
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.. _`Adrian Holovaty`: http://www.holovaty.com/
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.. _`washingtonpost.com`: http://www.washingtonpost.com/
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.. _`chicagocrime.org`: http://www.chicagocrime.org/
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.. _`Simon Willison`: http://simon.incutio.com/
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.. _`simon.incutio.com`: http://simon.incutio.com/
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.. _`Jacob Kaplan-Moss`: http://www.jacobian.org/
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.. _`Wilson Miner`: http://www.wilsonminer.com/
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Which sites use Django?
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-----------------------
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The Django wiki features a consistently growing `list of Django-powered sites`_.
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Feel free to add your Django-powered site to the list.
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.. _list of Django-powered sites: http://code.djangoproject.com/wiki/DjangoPoweredSites
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Django appears to be a MVC framework, but you call the Controller the "view", and the View the "template". How come you don't use the standard names?
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-----------------------------------------------------------------------------------------------------------------------------------------------------
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Well, the standard names are debatable.
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In our interpretation of MVC, the "view" describes the data that gets presented
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to the user. It's not necessarily *how* the data *looks*, but *which* data is
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presented. The view describes *which data you see*, not *how you see it.* It's
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a subtle distinction.
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So, in our case, a "view" is the Python callback function for a particular URL,
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because that callback function describes which data is presented.
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Furthermore, it's sensible to separate content from presentation -- which is
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where templates come in. In Django, a "view" describes which data is presented,
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but a view normally delegates to a template, which describes *how* the data is
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presented.
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Where does the "controller" fit in, then? In Django's case, it's probably the
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framework itself: the machinery that sends a request to the appropriate view,
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according to the Django URL configuration.
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If you're hungry for acronyms, you might say that Django is a "MTV" framework
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-- that is, "model", "template", and "view." That breakdown makes much more
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sense.
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At the end of the day, of course, it comes down to getting stuff done. And,
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regardless of how things are named, Django gets stuff done in a way that's most
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logical to us.
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<Framework X> does <feature Y> -- why doesn't Django?
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-----------------------------------------------------
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We're well aware that there are other awesome Web frameworks out there, and
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we're not adverse to borrowing ideas where appropriate. However, Django was
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developed precisely because we were unhappy with the status quo, so please be
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aware that "because <Framework X>" does it is not going to be sufficient reason
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to add a given feature to Django.
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Why did you write all of Django from scratch, instead of using other Python libraries?
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--------------------------------------------------------------------------------------
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When Django was originally written a couple of years ago, Adrian and Simon
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spent quite a bit of time exploring the various Python Web frameworks
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available.
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In our opinion, none of them were completely up to snuff.
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We're picky. You might even call us perfectionists. (With deadlines.)
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Over time, we stumbled across open-source libraries that did things we'd
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already implemented. It was reassuring to see other people solving similar
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problems in similar ways, but it was too late to integrate outside code: We'd
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already written, tested and implemented our own framework bits in several
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production settings -- and our own code met our needs delightfully.
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In most cases, however, we found that existing frameworks/tools inevitably had
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some sort of fundamental, fatal flaw that made us squeamish. No tool fit our
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philosophies 100%.
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Like we said: We're picky.
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We've documented our philosophies on the `design philosophies page`_.
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.. _design philosophies page: http://www.djangoproject.com/documentation/design_philosophies/
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Do you have any of those nifty "screencast" things?
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---------------------------------------------------
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You can bet your bottom they're on the way. But, since we're still hammering
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out a few points, we want to make sure they reflect the final state of things
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at Django 1.0, not some intermediary step. In other words, we don't want to
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spend a lot of energy creating screencasts yet, because Django APIs will shift.
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In the meantime, though, check out this `unofficial Django screencast`_.
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.. _unofficial Django screencast: http://www.throwingbeans.org/django_screencasts.html
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When will you release Django 1.0?
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---------------------------------
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Short answer: When we're comfortable with Django's APIs, have added all
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features that we feel are necessary to earn a "1.0" status, and are ready to
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begin maintaining backwards compatibility. This should happen in a couple of
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months or so, although it's entirely possible that it could happen earlier.
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That translates into summer 2006.
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The merging of Django's `magic-removal branch`_ went a long way toward Django
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1.0.
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Of course, you should note that `quite a few production sites`_ use Django in
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its current status. Don't let the lack of a 1.0 turn you off.
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.. _magic-removal branch: http://code.djangoproject.com/wiki/RemovingTheMagic
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.. _quite a few production sites: http://code.djangoproject.com/wiki/DjangoPoweredSites
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How can I download the Django documentation to read it offline?
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---------------------------------------------------------------
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The Django docs are available in the ``docs`` directory of each Django tarball
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release. These docs are in ReST (restructured text) format, and each text file
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corresponds to a Web page on the official Django site.
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Because the documentation is `stored in revision control`_, you can browse
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documentation changes just like you can browse code changes.
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Technically, the docs on Django's site are generated from the latest development
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versions of those ReST documents, so the docs on the Django site may offer more
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information than the docs that come with the latest Django release.
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.. _stored in revision control: http://code.djangoproject.com/browser/django/trunk/docs
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Installation questions
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======================
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How do I get started?
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---------------------
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#. `Download the code`_.
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#. Install Django (read the `installation guide`_).
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#. Walk through the tutorial_.
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#. Check out the rest of the documentation_, and `ask questions`_ if you
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run into trouble.
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.. _`Download the code`: http://www.djangoproject.com/download/
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.. _`installation guide`: http://www.djangoproject.com/documentation/install/
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.. _tutorial: http://www.djangoproject.com/documentation/tutorial1/
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.. _documentation: http://www.djangoproject.com/documentation/
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.. _ask questions: http://www.djangoproject.com/community/
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How do I fix the "install a later version of setuptools" error?
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---------------------------------------------------------------
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Just run the ``ez_setup.py`` script in the Django distribution.
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What are Django's prerequisites?
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--------------------------------
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Django requires Python_ 2.3 or later. No other Python libraries are required.
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For a development environment -- if you just want to experiment with Django --
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you don't need to have a separate Web server installed; Django comes with its
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own lightweight development server. For a production environment, we recommend
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`Apache 2`_ and mod_python_, although Django follows the WSGI_ spec, which
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means it can run on a variety of server platforms.
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You'll also need a database engine. PostgreSQL_ is recommended, and MySQL_
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and `SQLite 3`_ are supported.
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.. _Python: http://www.python.org/
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.. _Apache 2: http://httpd.apache.org/
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.. _mod_python: http://www.modpython.org/
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.. _WSGI: http://www.python.org/peps/pep-0333.html
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.. _PostgreSQL: http://www.postgresql.org/
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.. _MySQL: http://www.mysql.com/
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.. _`SQLite 3`: http://www.sqlite.org/
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Do I have to use mod_python?
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----------------------------
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Not if you just want to play around and develop things on your local computer.
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Django comes with its own Web server, and things should Just Work.
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For production use, though, we recommend mod_python. The Django developers have
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been running it on mod_python for more than two years, and it's quite stable.
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However, if you don't want to use mod_python, you can use a different server,
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as long as that server has WSGI_ hooks. See the `server arrangements wiki page`_.
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.. _WSGI: http://www.python.org/peps/pep-0333.html
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.. _server arrangements wiki page: http://code.djangoproject.com/wiki/ServerArrangements
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How do I install mod_python on Windows?
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---------------------------------------
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* For Python 2.4, check out this `guide to mod_python & Python 2.3`_.
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* For Python 2.3, grab mod_python from http://www.modpython.org/ and read
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`Running mod_python on Apache on Windows2000`_.
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* Also, try this (not Windows-specific) `guide to getting mod_python
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working`_.
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.. _`guide to mod_python & Python 2.3`: http://www.lehuen.com/nicolas/index.php/2005/02/21/39-win32-build-of-mod_python-314-for-python-24
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.. _`Running mod_python on Apache on Windows2000`: http://groups-beta.google.com/group/comp.lang.python/msg/139af8c83a5a9d4f
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.. _`guide to getting mod_python working`: http://www.dscpl.com.au/articles/modpython-001.html
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Will Django run under shared hosting (like TextDrive or Dreamhost)?
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-------------------------------------------------------------------
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See our `Django-friendly Web hosts`_ page.
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.. _`Django-friendly Web hosts`: http://code.djangoproject.com/wiki/DjangoFriendlyWebHosts
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Should I use the official version or development version?
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---------------------------------------------------------
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The Django developers improve Django every day and are pretty good about not
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checking in broken code. We use the development code (from the Subversion
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repository) directly on our servers, so we consider it stable. With that in
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mind, we recommend that you use the latest development code, because it
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generally contains more features and fewer bugs than the "official" releases.
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Using Django
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============
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Why do I get an error about importing DJANGO_SETTINGS_MODULE?
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-------------------------------------------------------------
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Make sure that:
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* The environment variable DJANGO_SETTINGS_MODULE is set to a fully-qualified
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Python module (i.e. "mysite.settings.main").
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* Said module is on ``sys.path`` (``import mysite.settings.main`` should work).
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* The module doesn't contain syntax errors (of course).
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* If you're using mod_python but *not* using Django's request handler,
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you'll need to work around a mod_python bug related to the use of
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``SetEnv``; before you import anything from Django you'll need to do
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the following::
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os.environ.update(req.subprocess_env)
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(where ``req`` is the mod_python request object).
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I can't stand your template language. Do I have to use it?
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----------------------------------------------------------
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We happen to think our template engine is the best thing since chunky bacon,
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but we recognize that choosing a template language runs close to religion.
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There's nothing about Django that requires using the template language, so
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if you're attached to ZPT, Cheetah, or whatever, feel free to use those.
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Do I have to use your model/database layer?
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-------------------------------------------
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Nope. Just like the template system, the model/database layer is decoupled from
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the rest of the framework. The one exception is: If you use a different
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database library, you won't get to use Django's automatically-generated admin
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site. That app is coupled to the Django database layer.
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How do I use image and file fields?
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-----------------------------------
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Using a ``FileField`` or an ``ImageField`` in a model takes a few steps:
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#. In your settings file, define ``MEDIA_ROOT`` as the full path to
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a directory where you'd like Django to store uploaded files. (For
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performance, these files are not stored in the database.) Define
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``MEDIA_URL`` as the base public URL of that directory. Make sure that
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this directory is writable by the Web server's user account.
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#. Add the ``FileField`` or ``ImageField`` to your model, making sure
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to define the ``upload_to`` option to tell Django to which subdirectory
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of ``MEDIA_ROOT`` it should upload files.
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#. All that will be stored in your database is a path to the file
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(relative to ``MEDIA_ROOT``). You'll must likely want to use the
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convenience ``get_<fieldname>_url`` function provided by Django. For
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example, if your ``ImageField`` is called ``mug_shot``, you can get the
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absolute URL to your image in a template with
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``{{ object.get_mug_shot_url }}``.
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If I make changes to a model, how do I update the database?
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-----------------------------------------------------------
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If you don't mind clearing data, just pipe the output of the appropriate
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``django-admin.py sqlreset`` command into your database's command-line utility.
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For example::
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django-admin.py sqlreset appname | psql dbname
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That "psql" assumes you're using PostgreSQL. If you're using MySQL, use the
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appropriate command-line utility, ``mysql``.
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``django-admin.py sqlreset`` outputs SQL that clears the app's database
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table(s) and creates new ones. The above command uses a Unix pipe to send the
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SQL directly to the PostgreSQL command-line utility, which accepts SQL as
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input.
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If you do care about deleting data, you'll have to execute the ``ALTER TABLE``
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statements manually in your database. That's the way we've always done it,
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because dealing with data is a very sensitive operation that we've wanted to
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avoid automating. That said, there's some work being done to add partially
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automated database-upgrade functionality.
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Do Django models support multiple-column primary keys?
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------------------------------------------------------
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No. Only single-column primary keys are supported.
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But this isn't an issue in practice, because there's nothing stopping you from
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adding other constraints (using the ``unique_together`` model option or
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creating the constraint directly in your database), and enforcing the
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uniqueness at that level. Single-column primary keys are needed for things such
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as the admin interface to work; e.g., you need a simple way of being able to
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specify an object to edit or delete.
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The database API
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================
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How can I see the raw SQL queries Django is running?
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----------------------------------------------------
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Make sure your Django ``DEBUG`` setting is set to ``True``. Then, just do
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this::
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>>> from django.db import connection
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>>> connection.queries
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[{'sql': 'SELECT polls_polls.id,polls_polls.question,polls_polls.pub_date FROM polls_polls',
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'time': '0.002'}]
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``connection.queries`` is only available if ``DEBUG`` is ``True``. It's a list
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of dictionaries in order of query execution. Each dictionary has the following::
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``sql`` -- The raw SQL statement
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``time`` -- How long the statement took to execute, in seconds.
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``connection.queries`` includes all SQL statements -- INSERTs, UPDATES,
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SELECTs, etc. Each time your app hits the database, the query will be recorded.
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Can I use Django with a pre-existing database?
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----------------------------------------------
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Yes. See `Integrating with a legacy database`_.
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.. _`Integrating with a legacy database`: http://www.djangoproject.com/documentation/legacy_databases/
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The admin site
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==============
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I can't log in. When I enter a valid username and password, it just brings up the login page again, with no error messages.
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---------------------------------------------------------------------------------------------------------------------------
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The login cookie isn't being set correctly, because the domain of the cookie
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sent out by Django doesn't match the domain in your browser. Try these two
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things:
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* Set the ``SESSION_COOKIE_DOMAIN`` setting in your admin config file
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to match your domain. For example, if you're going to
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"http://www.mysite.com/admin/" in your browser, in
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"myproject.settings" you should set ``SESSION_COOKIE_DOMAIN = 'www.mysite.com'``.
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* Some browsers (Firefox?) don't like to accept cookies from domains that
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don't have dots in them. If you're running the admin site on "localhost"
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or another domain that doesn't have a dot in it, try going to
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"localhost.localdomain" or "127.0.0.1". And set
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``SESSION_COOKIE_DOMAIN`` accordingly.
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I can't log in. When I enter a valid username and password, it brings up the login page again, with a "Please enter a correct username and password" error.
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-----------------------------------------------------------------------------------------------------------------------------------------------------------
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|
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|
If you're sure your username and password are correct, make sure your user
|
|
account has ``is_active`` and ``is_staff`` set to True. The admin site only
|
|
allows access to users with those two fields both set to True.
|
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|
How do I automatically set a field's value to the user who last edited the object in the admin?
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|
-----------------------------------------------------------------------------------------------
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|
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|
At this point, you can't do this. But it's an oft-requested feature, so we're
|
|
discussing how it can be implemented. The problem is we don't want to couple
|
|
the model layer with the admin layer with the request layer (to get the current
|
|
user). It's a tricky problem.
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|
|
|
How do I limit admin access so that objects can only be edited by the users who created them?
|
|
---------------------------------------------------------------------------------------------
|
|
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|
See the answer to the previous question.
|
|
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|
My admin-site CSS and images showed up fine using the development server, but they're not displaying when using mod_python.
|
|
---------------------------------------------------------------------------------------------------------------------------
|
|
|
|
See `serving the admin files`_ in the "How to use Django with mod_python"
|
|
documentation.
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|
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|
.. _serving the admin files: http://www.djangoproject.com/documentation/modpython/#serving-the-admin-files
|
|
|
|
My "list_filter" contains a ManyToManyField, but the filter doesn't display.
|
|
----------------------------------------------------------------------------
|
|
|
|
Django won't bother displaying the filter for a ``ManyToManyField`` if there
|
|
are fewer than two related objects.
|
|
|
|
For example, if your ``list_filter`` includes ``sites``, and there's only one
|
|
site in your database, it won't display a "Site" filter. In that case,
|
|
filtering by site would be meaningless.
|
|
|
|
How can I customize the functionality of the admin interface?
|
|
-------------------------------------------------------------
|
|
|
|
You've got several options. If you want to piggyback on top of an add/change
|
|
form that Django automatically generates, you can attach arbitrary JavaScript
|
|
modules to the page via the model's ``class Admin`` ``js`` parameter. That
|
|
parameter is a list of URLs, as strings, pointing to JavaScript modules that
|
|
will be included within the admin form via a ``<script>`` tag.
|
|
|
|
If you want more flexibility than simply tweaking the auto-generated forms,
|
|
feel free to write custom views for the admin. The admin is powered by Django
|
|
itself, and you can write custom views that hook into the authentication
|
|
system, check permissions and do whatever else they need to do.
|
|
|
|
If you want to customize the look-and-feel of the admin interface, read the
|
|
next question.
|
|
|
|
The dynamically-generated admin site is ugly! How can I change it?
|
|
------------------------------------------------------------------
|
|
|
|
We like it, but if you don't agree, you can modify the admin site's
|
|
presentation by editing the CSS stylesheet and/or associated image files. The
|
|
site is built using semantic HTML and plenty of CSS hooks, so any changes you'd
|
|
like to make should be possible by editing the stylesheet. We've got a
|
|
`guide to the CSS used in the admin`_ to get you started.
|
|
|
|
.. _`guide to the CSS used in the admin`: http://www.djangoproject.com/documentation/admin_css/
|
|
|
|
How do I create users without having to edit password hashes?
|
|
-------------------------------------------------------------
|
|
|
|
We don't recommend you create users via the admin interface, because at the
|
|
moment it requires you to edit password hashes manually. (Passwords are hashed
|
|
using one-way hash algorithms for security; there's currently no Web interface
|
|
for changing passwords by entering the actual password rather than the hash.)
|
|
|
|
To create a user, you'll have to use the Python API. See `creating users`_ for
|
|
full info.
|
|
|
|
.. _creating users: http://www.djangoproject.com/documentation/authentication/#creating-users
|