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@rturowicz
Forked from c4urself/url_patterns.py
Created March 6, 2013 11:41
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(r'^articles/(?P<year>\d{4}/?$, 'main.views.year'),
# When a use case comes up that a month needs to be involved as
# well, you add an argument in your regex:
(r'^articles/(?P<year>\d{4}/(?P<month>\d{2})/?$, 'main.views.year_month'),
# That works fine, unless of course you want to show something
# different for just the year, in which case the following case can be
# used, making separate views based on the arguments as djangoproject
# suggests (http://docs.djangoproject.com/en/dev/topics/http/urls/)
urlpatterns = patterns('',
(r'^articles/(?P<year>\d{4})/$', 'news.views.year_archive'),
(r'^articles/(?P<year>\d{4})/(?P<month>\d{2})/$', 'news.views.month_archive'),
(r'^articles/(?P<year>\d{4})/(?P<month>\d{2})/(?P<day>\d+)/$', 'news.views.article_detail'),
)
# However it would be nice if we could make one pattern for one
# view with optional arguments. Luckily the django url reversing
# engine allows this, and we can do the following:
url(r'''^community/(?P<base_slug>[^/]+)/?(?P<school_slug>[^/]+)?/?(?P<grade_slug>[^/]+)?/?(?P<class_slug> [^/]+)?$''',
'changer.socialschools.posts.views.show_community',
name="community"),
# This works fine when calling the url, but reversing will cause a
# problem because django will treat the backslashes as optional and
# not include them in the reversed url, causing munged urls:
# community/base/schoolgradeclass
# To counter this we can alter the regex as follows, by making the
# '/' dependent on the presence of the corresponding slug. We make
# sure not to group this by adding (?:) so as not to pollute the
# django reversing engine with unnecessary arguments and at the
# same time keeping the arguments optional:
url(r'''^community(?:\/(?P<base_slug>[^/]+))'''
r'''(?:\/(?P<school_slug>[^/]+))?'''
r'''(?:\/(?P<grade_slug>[^/]+))?'''
r'''(?:\/(?P<class_slug>[^/]+))?$''',
'changer.socialschools.communities.views.this_community',
name="community-view"),
# This makes it work with one url pattern. But what if we want to
# make a pattern for recent news in that a particular community,
# such as news in a particular grade or school? We can add an
# negative lookahead assertion:
url(r'''^community/(?P<base_slug>[^/]+)'''
r'''(?:\/(?P<school_slug>(?!recent)[^/]+))?'''
r'''(?:\/(?P<grade_slug>(?!recent)[^/]+))?'''
r'''(?:\/(?P<class_slug>(?!recent)[^/]+))?/recent/?$''',
'changer.socialschools.communities.views.show_recent',
name="community-recent"),
# This makes the following possible:
"""
>>> from django.core.urlresolvers import resolve
>>> resolve('/community/base/school/grade/class/recent')
ResolverMatch(func=<function show_recent at 0x103097d70>, args=(), kwargs={'class_slug': 'class', 'base_slug': 'base', 'grade_slug': 'grade', 'school_slug': 'school'}, url_name='community_recent', app_name='None', namespace='')
"""
# and also:
"""
>>> resolve('/community/base/school/grade/class')
ResolverMatch(func=<function this_community at 0x10307a500>, args=(), kwargs={'class_slug': 'class', 'base_slug': 'base', 'grade_slug': 'grade', 'school_slug': 'school'}, url_name='community-view', app_name='None', namespace='')
"""
# So that if we only want news for the school, 'recent' is taken
# up as a slug for the grade:
"""
>>> resolve('/community/base/school/recent')
ResolverMatch(func=<function show_recent at 0x1031a50c8>, args=(), kwargs={'class_slug': None, 'base_slug': 'base', 'grade_slug': None, 'school_slug': 'school'}, url_name='community-recent', app_name='None', namespace='')
"""
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