author | Nishanth Amuluru <nishanth@fossee.in> |
Sat, 08 Jan 2011 22:20:41 +0530 | |
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Writing your first Django app, part 2 |
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===================================== |
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This tutorial begins where :doc:`Tutorial 1 </intro/tutorial01>` left off. We're |
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continuing the Web-poll application and will focus on Django's |
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automatically-generated admin site. |
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.. admonition:: Philosophy |
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Generating admin sites for your staff or clients to add, change and delete |
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content is tedious work that doesn't require much creativity. For that |
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reason, Django entirely automates creation of admin interfaces for models. |
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Django was written in a newsroom environment, with a very clear separation |
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between "content publishers" and the "public" site. Site managers use the |
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system to add news stories, events, sports scores, etc., and that content is |
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displayed on the public site. Django solves the problem of creating a |
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unified interface for site administrators to edit content. |
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The admin isn't necessarily intended to be used by site visitors; it's for |
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site managers. |
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Activate the admin site |
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======================= |
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The Django admin site is not activated by default -- it's an opt-in thing. To |
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activate the admin site for your installation, do these three things: |
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* Add ``"django.contrib.admin"`` to your :setting:`INSTALLED_APPS` setting. |
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* Run ``python manage.py syncdb``. Since you have added a new application |
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to :setting:`INSTALLED_APPS`, the database tables need to be updated. |
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* Edit your ``mysite/urls.py`` file and uncomment the lines that reference |
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the admin -- there are three lines in total to uncomment. This file is a |
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URLconf; we'll dig into URLconfs in the next tutorial. For now, all you |
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need to know is that it maps URL roots to applications. In the end, you |
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should have a ``urls.py`` file that looks like this: |
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.. versionchanged:: 1.1 |
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The method for adding admin urls has changed in Django 1.1. |
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.. parsed-literal:: |
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from django.conf.urls.defaults import * |
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# Uncomment the next two lines to enable the admin: |
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**from django.contrib import admin** |
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**admin.autodiscover()** |
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urlpatterns = patterns('', |
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# Example: |
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# (r'^mysite/', include('mysite.foo.urls')), |
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# Uncomment the admin/doc line below and add 'django.contrib.admindocs' |
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# to INSTALLED_APPS to enable admin documentation: |
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# (r'^admin/doc/', include('django.contrib.admindocs.urls')), |
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# Uncomment the next line to enable the admin: |
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**(r'^admin/', include(admin.site.urls)),** |
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) |
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(The bold lines are the ones that needed to be uncommented.) |
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Start the development server |
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============================ |
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Let's start the development server and explore the admin site. |
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Recall from Tutorial 1 that you start the development server like so: |
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.. code-block:: bash |
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python manage.py runserver |
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Now, open a Web browser and go to "/admin/" on your local domain -- e.g., |
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http://127.0.0.1:8000/admin/. You should see the admin's login screen: |
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.. image:: _images/admin01.png |
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:alt: Django admin login screen |
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Enter the admin site |
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==================== |
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Now, try logging in. (You created a superuser account in the first part of this |
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tutorial, remember? If you didn't create one or forgot the password you can |
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:ref:`create another one <topics-auth-creating-superusers>`.) You should see |
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the Django admin index page: |
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.. image:: _images/admin02t.png |
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:alt: Django admin index page |
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You should see a few other types of editable content, including groups, users |
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and sites. These are core features Django ships with by default. |
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Make the poll app modifiable in the admin |
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========================================= |
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But where's our poll app? It's not displayed on the admin index page. |
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Just one thing to do: We need to tell the admin that ``Poll`` |
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objects have an admin interface. To do this, create a file called |
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``admin.py`` in your ``polls`` directory, and edit it to look like this:: |
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from polls.models import Poll |
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from django.contrib import admin |
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admin.site.register(Poll) |
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You'll need to restart the development server to see your changes. Normally, |
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the server auto-reloads code every time you modify a file, but the action of |
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creating a new file doesn't trigger the auto-reloading logic. |
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Explore the free admin functionality |
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==================================== |
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Now that we've registered ``Poll``, Django knows that it should be displayed on |
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the admin index page: |
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.. image:: _images/admin03t.png |
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:alt: Django admin index page, now with polls displayed |
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123 |
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Click "Polls." Now you're at the "change list" page for polls. This page |
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displays all the polls in the database and lets you choose one to change it. |
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There's the "What's up?" poll we created in the first tutorial: |
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.. image:: _images/admin04t.png |
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:alt: Polls change list page |
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130 |
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131 |
Click the "What's up?" poll to edit it: |
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132 |
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133 |
.. image:: _images/admin05t.png |
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134 |
:alt: Editing form for poll object |
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135 |
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136 |
Things to note here: |
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* The form is automatically generated from the Poll model. |
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139 |
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* The different model field types (:class:`~django.db.models.DateTimeField`, |
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:class:`~django.db.models.CharField`) correspond to the appropriate HTML |
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input widget. Each type of field knows how to display itself in the Django |
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143 |
admin. |
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* Each :class:`~django.db.models.DateTimeField` gets free JavaScript |
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shortcuts. Dates get a "Today" shortcut and calendar popup, and times get |
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a "Now" shortcut and a convenient popup that lists commonly entered times. |
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148 |
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The bottom part of the page gives you a couple of options: |
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150 |
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* Save -- Saves changes and returns to the change-list page for this type of |
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object. |
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153 |
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* Save and continue editing -- Saves changes and reloads the admin page for |
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this object. |
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156 |
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* Save and add another -- Saves changes and loads a new, blank form for this |
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type of object. |
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159 |
|
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* Delete -- Displays a delete confirmation page. |
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161 |
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162 |
Change the "Date published" by clicking the "Today" and "Now" shortcuts. Then |
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click "Save and continue editing." Then click "History" in the upper right. |
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164 |
You'll see a page listing all changes made to this object via the Django admin, |
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165 |
with the timestamp and username of the person who made the change: |
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166 |
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167 |
.. image:: _images/admin06t.png |
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168 |
:alt: History page for poll object |
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169 |
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170 |
Customize the admin form |
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171 |
======================== |
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172 |
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173 |
Take a few minutes to marvel at all the code you didn't have to write. By |
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174 |
registering the Poll model with ``admin.site.register(Poll)``, Django was able |
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175 |
to construct a default form representation. Often, you'll want to customize how |
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176 |
the admin form looks and works. You'll do this by telling Django the options |
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you want when you register the object. |
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178 |
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179 |
Let's see how this works by re-ordering the fields on the edit form. Replace |
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180 |
the ``admin.site.register(Poll)`` line with:: |
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181 |
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182 |
class PollAdmin(admin.ModelAdmin): |
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183 |
fields = ['pub_date', 'question'] |
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184 |
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185 |
admin.site.register(Poll, PollAdmin) |
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186 |
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187 |
You'll follow this pattern -- create a model admin object, then pass it as the |
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188 |
second argument to ``admin.site.register()`` -- any time you need to change the |
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189 |
admin options for an object. |
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190 |
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191 |
This particular change above makes the "Publication date" come before the |
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192 |
"Question" field: |
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193 |
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194 |
.. image:: _images/admin07.png |
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195 |
:alt: Fields have been reordered |
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196 |
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197 |
This isn't impressive with only two fields, but for admin forms with dozens |
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198 |
of fields, choosing an intuitive order is an important usability detail. |
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199 |
|
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200 |
And speaking of forms with dozens of fields, you might want to split the form |
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201 |
up into fieldsets:: |
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202 |
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203 |
class PollAdmin(admin.ModelAdmin): |
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204 |
fieldsets = [ |
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205 |
(None, {'fields': ['question']}), |
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206 |
('Date information', {'fields': ['pub_date']}), |
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207 |
] |
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208 |
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209 |
admin.site.register(Poll, PollAdmin) |
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210 |
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211 |
The first element of each tuple in ``fieldsets`` is the title of the fieldset. |
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212 |
Here's what our form looks like now: |
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213 |
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214 |
.. image:: _images/admin08t.png |
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215 |
:alt: Form has fieldsets now |
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216 |
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217 |
You can assign arbitrary HTML classes to each fieldset. Django provides a |
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218 |
``"collapse"`` class that displays a particular fieldset initially collapsed. |
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219 |
This is useful when you have a long form that contains a number of fields that |
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220 |
aren't commonly used:: |
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221 |
|
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class PollAdmin(admin.ModelAdmin): |
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fieldsets = [ |
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(None, {'fields': ['question']}), |
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('Date information', {'fields': ['pub_date'], 'classes': ['collapse']}), |
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] |
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228 |
.. image:: _images/admin09.png |
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:alt: Fieldset is initially collapsed |
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Adding related objects |
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====================== |
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OK, we have our Poll admin page. But a ``Poll`` has multiple ``Choices``, and |
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the admin page doesn't display choices. |
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|
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237 |
Yet. |
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238 |
|
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239 |
There are two ways to solve this problem. The first is to register ``Choice`` |
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240 |
with the admin just as we did with ``Poll``. That's easy:: |
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241 |
|
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from polls.models import Choice |
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243 |
|
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admin.site.register(Choice) |
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245 |
|
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246 |
Now "Choices" is an available option in the Django admin. The "Add choice" form |
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247 |
looks like this: |
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248 |
|
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249 |
.. image:: _images/admin10.png |
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250 |
:alt: Choice admin page |
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251 |
|
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252 |
In that form, the "Poll" field is a select box containing every poll in the |
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253 |
database. Django knows that a :class:`~django.db.models.ForeignKey` should be |
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254 |
represented in the admin as a ``<select>`` box. In our case, only one poll |
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255 |
exists at this point. |
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256 |
|
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257 |
Also note the "Add Another" link next to "Poll." Every object with a |
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258 |
``ForeignKey`` relationship to another gets this for free. When you click "Add |
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259 |
Another," you'll get a popup window with the "Add poll" form. If you add a poll |
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in that window and click "Save," Django will save the poll to the database and |
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261 |
dynamically add it as the selected choice on the "Add choice" form you're |
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262 |
looking at. |
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263 |
|
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But, really, this is an inefficient way of adding Choice objects to the system. |
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It'd be better if you could add a bunch of Choices directly when you create the |
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Poll object. Let's make that happen. |
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267 |
|
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268 |
Remove the ``register()`` call for the Choice model. Then, edit the ``Poll`` |
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269 |
registration code to read:: |
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270 |
|
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class ChoiceInline(admin.StackedInline): |
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model = Choice |
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extra = 3 |
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274 |
|
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class PollAdmin(admin.ModelAdmin): |
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fieldsets = [ |
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277 |
(None, {'fields': ['question']}), |
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('Date information', {'fields': ['pub_date'], 'classes': ['collapse']}), |
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279 |
] |
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inlines = [ChoiceInline] |
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281 |
|
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282 |
admin.site.register(Poll, PollAdmin) |
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283 |
|
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284 |
This tells Django: "Choice objects are edited on the Poll admin page. By |
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285 |
default, provide enough fields for 3 choices." |
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286 |
|
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287 |
Load the "Add poll" page to see how that looks, you may need to restart your development server: |
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288 |
|
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289 |
.. image:: _images/admin11t.png |
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290 |
:alt: Add poll page now has choices on it |
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291 |
|
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292 |
It works like this: There are three slots for related Choices -- as specified |
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293 |
by ``extra`` -- and each time you come back to the "Change" page for an |
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294 |
already-created object, you get another three extra slots. |
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295 |
|
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296 |
One small problem, though. It takes a lot of screen space to display all the |
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297 |
fields for entering related Choice objects. For that reason, Django offers a |
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298 |
tabular way of displaying inline related objects; you just need to change |
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299 |
the ``ChoiceInline`` declaration to read:: |
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300 |
|
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301 |
class ChoiceInline(admin.TabularInline): |
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302 |
#... |
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303 |
|
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304 |
With that ``TabularInline`` (instead of ``StackedInline``), the |
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305 |
related objects are displayed in a more compact, table-based format: |
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306 |
|
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307 |
.. image:: _images/admin12.png |
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308 |
:alt: Add poll page now has more compact choices |
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309 |
|
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310 |
Customize the admin change list |
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311 |
=============================== |
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312 |
|
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313 |
Now that the Poll admin page is looking good, let's make some tweaks to the |
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314 |
"change list" page -- the one that displays all the polls in the system. |
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315 |
|
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316 |
Here's what it looks like at this point: |
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317 |
|
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318 |
.. image:: _images/admin04t.png |
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319 |
:alt: Polls change list page |
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320 |
|
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321 |
By default, Django displays the ``str()`` of each object. But sometimes it'd be |
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322 |
more helpful if we could display individual fields. To do that, use the |
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323 |
``list_display`` admin option, which is a tuple of field names to display, as |
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324 |
columns, on the change list page for the object:: |
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325 |
|
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326 |
class PollAdmin(admin.ModelAdmin): |
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327 |
# ... |
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328 |
list_display = ('question', 'pub_date') |
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329 |
|
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330 |
Just for good measure, let's also include the ``was_published_today`` custom |
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331 |
method from Tutorial 1:: |
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332 |
|
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333 |
class PollAdmin(admin.ModelAdmin): |
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334 |
# ... |
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335 |
list_display = ('question', 'pub_date', 'was_published_today') |
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336 |
|
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337 |
Now the poll change list page looks like this: |
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338 |
|
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339 |
.. image:: _images/admin13t.png |
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340 |
:alt: Polls change list page, updated |
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341 |
|
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342 |
You can click on the column headers to sort by those values -- except in the |
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343 |
case of the ``was_published_today`` header, because sorting by the output of |
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344 |
an arbitrary method is not supported. Also note that the column header for |
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345 |
``was_published_today`` is, by default, the name of the method (with |
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346 |
underscores replaced with spaces). But you can change that by giving that |
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347 |
method (in ``models.py``) a ``short_description`` attribute:: |
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348 |
|
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349 |
def was_published_today(self): |
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350 |
return self.pub_date.date() == datetime.date.today() |
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351 |
was_published_today.short_description = 'Published today?' |
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352 |
|
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353 |
Edit your admin.py file again and add an improvement to the Poll change list page: Filters. Add the |
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354 |
following line to ``PollAdmin``:: |
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355 |
|
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356 |
list_filter = ['pub_date'] |
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357 |
|
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358 |
That adds a "Filter" sidebar that lets people filter the change list by the |
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359 |
``pub_date`` field: |
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360 |
|
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361 |
.. image:: _images/admin14t.png |
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362 |
:alt: Polls change list page, updated |
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363 |
|
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364 |
The type of filter displayed depends on the type of field you're filtering on. |
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365 |
Because ``pub_date`` is a DateTimeField, Django knows to give the default |
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366 |
filter options for DateTimeFields: "Any date," "Today," "Past 7 days," |
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367 |
"This month," "This year." |
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368 |
|
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369 |
This is shaping up well. Let's add some search capability:: |
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370 |
|
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371 |
search_fields = ['question'] |
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372 |
|
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373 |
That adds a search box at the top of the change list. When somebody enters |
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374 |
search terms, Django will search the ``question`` field. You can use as many |
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375 |
fields as you'd like -- although because it uses a ``LIKE`` query behind the |
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376 |
scenes, keep it reasonable, to keep your database happy. |
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377 |
|
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378 |
Finally, because Poll objects have dates, it'd be convenient to be able to |
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379 |
drill down by date. Add this line:: |
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380 |
|
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381 |
date_hierarchy = 'pub_date' |
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382 |
|
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383 |
That adds hierarchical navigation, by date, to the top of the change list page. |
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384 |
At top level, it displays all available years. Then it drills down to months |
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385 |
and, ultimately, days. |
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386 |
|
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387 |
Now's also a good time to note that change lists give you free pagination. The |
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388 |
default is to display 50 items per page. Change-list pagination, search boxes, |
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389 |
filters, date-hierarchies and column-header-ordering all work together like you |
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390 |
think they should. |
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391 |
|
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392 |
Customize the admin look and feel |
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393 |
================================= |
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394 |
|
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395 |
Clearly, having "Django administration" at the top of each admin page is |
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396 |
ridiculous. It's just placeholder text. |
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397 |
|
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398 |
That's easy to change, though, using Django's template system. The Django admin |
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399 |
is powered by Django itself, and its interfaces use Django's own template |
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400 |
system. |
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401 |
|
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402 |
Open your settings file (``mysite/settings.py``, remember) and look at the |
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403 |
:setting:`TEMPLATE_DIRS` setting. :setting:`TEMPLATE_DIRS` is a tuple of |
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404 |
filesystem directories to check when loading Django templates. It's a search |
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405 |
path. |
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406 |
|
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407 |
By default, :setting:`TEMPLATE_DIRS` is empty. So, let's add a line to it, to |
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408 |
tell Django where our templates live:: |
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409 |
|
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410 |
TEMPLATE_DIRS = ( |
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411 |
"/home/my_username/mytemplates", # Change this to your own directory. |
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412 |
) |
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413 |
|
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414 |
Now copy the template ``admin/base_site.html`` from within the default Django |
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415 |
admin template directory in the source code of Django itself |
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416 |
(``django/contrib/admin/templates``) into an ``admin`` subdirectory of |
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417 |
whichever directory you're using in :setting:`TEMPLATE_DIRS`. For example, if |
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418 |
your :setting:`TEMPLATE_DIRS` includes ``"/home/my_username/mytemplates"``, as |
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419 |
above, then copy ``django/contrib/admin/templates/admin/base_site.html`` to |
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420 |
``/home/my_username/mytemplates/admin/base_site.html``. Don't forget that |
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421 |
``admin`` subdirectory. |
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422 |
|
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423 |
Then, just edit the file and replace the generic Django text with your own |
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424 |
site's name as you see fit. |
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425 |
|
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426 |
This template file contains lots of text like ``{% block branding %}`` |
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427 |
and ``{{ title }}``. The ``{%`` and ``{{`` tags are part of Django's |
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428 |
template language. When Django renders ``admin/base_site.html``, this |
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429 |
template language will be evaluated to produce the final HTML page. |
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430 |
Don't worry if you can't make any sense of the template right now -- |
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431 |
we'll delve into Django's templating language in Tutorial 3. |
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432 |
|
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433 |
Note that any of Django's default admin templates can be overridden. To |
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434 |
override a template, just do the same thing you did with ``base_site.html`` -- |
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435 |
copy it from the default directory into your custom directory, and make |
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436 |
changes. |
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437 |
|
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438 |
Astute readers will ask: But if :setting:`TEMPLATE_DIRS` was empty by default, |
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439 |
how was Django finding the default admin templates? The answer is that, by |
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440 |
default, Django automatically looks for a ``templates/`` subdirectory within |
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441 |
each app package, for use as a fallback. See the :ref:`template loader |
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442 |
documentation <template-loaders>` for full information. |
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443 |
|
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444 |
Customize the admin index page |
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445 |
============================== |
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446 |
|
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447 |
On a similar note, you might want to customize the look and feel of the Django |
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448 |
admin index page. |
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449 |
|
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450 |
By default, it displays all the apps in :setting:`INSTALLED_APPS` that have been |
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451 |
registered with the admin application, in alphabetical order. You may want to |
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452 |
make significant changes to the layout. After all, the index is probably the |
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453 |
most important page of the admin, and it should be easy to use. |
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454 |
|
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455 |
The template to customize is ``admin/index.html``. (Do the same as with |
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456 |
``admin/base_site.html`` in the previous section -- copy it from the default |
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457 |
directory to your custom template directory.) Edit the file, and you'll see it |
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458 |
uses a template variable called ``app_list``. That variable contains every |
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459 |
installed Django app. Instead of using that, you can hard-code links to |
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460 |
object-specific admin pages in whatever way you think is best. Again, |
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461 |
don't worry if you can't understand the template language -- we'll cover that |
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462 |
in more detail in Tutorial 3. |
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463 |
|
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464 |
When you're comfortable with the admin site, read :doc:`part 3 of this tutorial |
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465 |
</intro/tutorial03>` to start working on public poll views. |