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Edited docs/url_dispatch.txt changes from [4901]

git-svn-id: http://code.djangoproject.com/svn/django/trunk@4966 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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commit 421be9fb2a4dd1f13023adb33a79f1bdd595d9bc 1 parent a698afe
@adrianholovaty adrianholovaty authored
Showing with 36 additions and 20 deletions.
  1. +36 −20 docs/url_dispatch.txt
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56 docs/url_dispatch.txt
@@ -192,10 +192,11 @@ The remaining arguments should be tuples in this format::
url
---
-**New in development version**
-The ``url()`` function can be used instead of a tuple as an argument to
-``patterns()``. This is convenient if you wish to specify a name without the
+**New in Django development version**
+
+You can use the ``url()`` function, instead of a tuple, as an argument to
+``patterns()``. This is convenient if you want to specify a name without the
optional extra arguments dictionary. For example::
urlpatterns = patterns('',
@@ -498,26 +499,40 @@ the view prefix (as explained in "The view prefix" above) will have no effect.
Naming URL patterns
===================
-**New in development version**
+**New in Django development version**
+
+It's fairly common to use the same view function in multiple URL patterns in
+your URLconf. For example, these two URL patterns both point to the ``archive``
+view::
+
+ urlpatterns = patterns('',
+ (r'/archive/(\d{4})/$', archive),
+ (r'/archive-summary/(\d{4})/$', archive, {'summary': True}),
+ )
+
+This is completely valid, but it leads to problems when you try to do reverse
+URL matching (through the ``permalink()`` decorator or the ``{% url %}``
+template tag). Continuing this example, if you wanted to retrieve the URL for
+the ``archive`` view, Django's reverse URL matcher would get confused, because
+*two* URLpatterns point at that view.
-It is fairly common to use the same view function in multiple URL patterns in
-your URLConf. This leads to problems when you come to do reverse URL matching,
-because the ``permalink()`` decorator and ``{% url %}`` template tag use the
-name of the view function to find a match.
+To solve this problem, Django supports **named URL patterns**. That is, you can
+give a name to a URL pattern in order to distinguish it from other patterns
+using the same view and parameters. Then, you can use this name in reverse URL
+matching.
-To solve this problem, you can give a name to each of your URL patterns in
-order to distinguish them from other patterns using the same views and
-parameters. You can then use this name wherever you would otherwise use the
-name of the view function. For example, if you URLConf contains::
+Here's the above example, rewritten to used named URL patterns::
urlpatterns = patterns('',
url(r'/archive/(\d{4})/$', archive, name="full-archive"),
url(r'/archive-summary/(\d{4})/$', archive, {'summary': True}, "arch-summary"),
)
-...you could refer to either the summary archive view in a template as::
+With these names in place (``full-archive`` and ``arch-summary``), you can
+target each pattern individually by using its name::
{% url arch-summary 1945 %}
+ {% url full-archive 2007 %}
Even though both URL patterns refer to the ``archive`` view here, using the
``name`` parameter to ``url()`` allows you to tell them apart in templates.
@@ -527,11 +542,12 @@ not restricted to valid Python names.
.. note::
- Make sure that when you name your URLs, you use names that are unlikely to
- clash with any other application's choice of names. If you call your URL
- pattern *comment* and another application does the same thing, there is no
- guarantee which URL will be inserted into your template when you use this
- name. Putting a prefix on your URL names, perhaps derived from
- the application name, will decrease the chances of collision. Something
- like *myapp-comment* is recommended over simply *comment*.
+ When you name your URL patterns, make sure you use names that are unlikely
+ to clash with any other application's choice of names. If you call your URL
+ pattern ``comment``, and another application does the same thing, there's
+ no guarantee which URL will be inserted into your template when you use
+ this name.
+ Putting a prefix on your URL names, perhaps derived from the application
+ name, will decrease the chances of collision. We recommend something like
+ ``myapp-comment`` instead of ``comment``.
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