Django how the urls are resolved? -

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im reviewing sample django code , trying understand how urls resolved?

list.html

categories

{% c in active_categories %}     <a href="{{c.get_absolute_url}}">{{c.name}}</a><br /> {% endfor %}

urls.py

from django.conf.urls import *  urlpatterns = patterns('ecomstore.catalog.views',             (r'^$','index',{'template_name':'catalog/index.html'},'catalog_home'),             (r'^category/(?p<category_slug>[-\w]+)/$','show_category',{'template_name':'catalog/category.html'},'catalog_category'),             (r'^product/(?p<product_slug>[-\w]+)/$','show_product',{'template_name':'catalog/product.html'},'catalog_product'),             )

the above html list categories without problem , called when enter following in browser..[http:127.0.0.1:8000]

when hover on - href="{{p.get_absolute_url}} - url resolved to--[http://127.0.0.1:8000/category/electronics/]

the p.get_absolute_url resolved electronics im wondering how "category" resolved in url..

models.py

class category(models.model):     name = models.charfield(max_length=50)     slug = models.slugfield(max_length=50,unique=true,help_text='unique value product page url created name')     description = models.textfield()     is_active = models.booleanfield(default=true)     meta_keywords = models.charfield("meta keywords",max_length=255,help_text="comma-delimited set of seo keywords meta tag")     meta_description = models.charfield("meta description",max_length=255,help_text="content description meta tag")     created_at = models.datetimefield(auto_now_add=true)     updated_at = models.datetimefield(auto_now_add=true)      class meta:         db_table = 'categories'         ordering = ['-created_at']         verbose_name_plural = 'categories'      def __unicode__(self):         return self.name      @models.permalink     def get_absolute_url(self):         return ('catalog_category',(),{'category_slug':self.slug})

hope question clear...

get_absolute_url function defined inside model (for example, category) model this:

class category(models.model):     name = models.charfield(max_length=200)     ...      def get_absolute_url(self):         return "/category/%s/" % self.slug

it possible use reverse function resolve url using pattern defined in urls.py:

def get_absolute_url(self):     return reverse('catalog_category', args=[str(self.slug)])

which equal old-fashioned form:

@models.permalink def get_absolute_url(self):     return ('catalog_category', (), {'category_slug': str(self.slug)})

in both ways, calling get_absolute_url method on category object, example category(name="electronics"), result in string: /category/electronics/.

as can see in urls.py, second url pattern named catalog_category, appeard in reverse function argument. when call reverse function, django urls.py files, looking pattern named catalog_category, , final url generated replacing url parameter (category_slug) self.slug.


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