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< title > Creating Custom Categories — Django Categories v1.1 documentation< / title >
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< p > Django Categories v1.1 documentation< / p >
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< div id = "title" > < h1 > Creating Custom Categories< / h1 > < / div >
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< li class = "toctree-l1" > < a class = "reference internal" href = "installation.html" > Installation< / a > < / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "getting_started.html" > Getting Started< / a > < / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "usage.html" > Using categories in templates< / a > < / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "registering_models.html" > Registering Models< / a > < / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "adding_the_fields.html" > Adding the fields to the database< / a > < / li >
< li class = "toctree-l1 current" > < a class = "current reference internal" href = "" > Creating Custom Categories< / a > < ul >
< li class = "toctree-l2" > < a class = "reference internal" href = "#name-only" > Name only< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "#name-and-other-data" > Name and other data< / a > < / li >
< / ul >
< / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "reference/index.html" > Reference< / a > < / li >
< / ul >
< h3 > This Page< / h3 >
< ul class = "this-page-menu" >
< li > < a href = "_sources/custom_categories.txt"
rel="nofollow">Show Source< / a > < / li >
< / ul >
< div id = "searchbox" style = "display: none" >
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< span class = "search-left" > < / span >
< input class = "prettysearch" type = "text" name = "q" size = "18" / >
< span class = "search-right" > < / span >
< / div >
< input type = "submit" value = "Search" class = "searchbutton" / >
< input type = "hidden" name = "check_keywords" value = "yes" / >
< input type = "hidden" name = "area" value = "default" / >
< / form >
< p class = "searchtip" style = "font-size: 90%" >
Enter search terms or a module, class or function name.
< / p >
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< script type = "text/javascript" > $ ( '#searchbox' ) . show ( 0 ) ; < / script >
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< div class = "section" id = "creating-custom-categories" >
< span id = "id1" > < / span > < h1 > Creating Custom Categories< a class = "headerlink" href = "#creating-custom-categories" title = "Permalink to this headline" > ¶< / a > < / h1 >
< p > Django Categories isn’ t just for using a single category model. It allows you to create your own custom category-like models with as little or much customization as you need.< / p >
< div class = "section" id = "name-only" >
< h2 > Name only< a class = "headerlink" href = "#name-only" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > For many cases, you want a simple user-managed lookup table. You can do this with just a little bit of code. The resulting model will include name, slug and active fields and a hierarchical admin.< / p >
< ol class = "arabic" >
< li > < p class = "first" > Create a model that subclasses < a class = "reference internal" href = "reference/models.html#CategoryBase" title = "CategoryBase" > < tt class = "xref py py-class docutils literal" > < span class = "pre" > CategoryBase< / span > < / tt > < / a > < / p >
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9< / pre > < / div > < / td > < td class = "code" > < div class = "highlight" > < pre > < span class = "kn" > from< / span > < span class = "nn" > categories.models< / span > < span class = "kn" > import< / span > < span class = "n" > CategoryBase< / span >
< span class = "k" > class< / span > < span class = "nc" > SimpleCategory< / span > < span class = "p" > (< / span > < span class = "n" > CategoryBase< / span > < span class = "p" > ):< / span >
< span class = "sd" > " " " < / span >
< span class = "sd" > A simple of catgorizing example< / span >
< span class = "sd" > " " " < / span >
< span class = "k" > class< / span > < span class = "nc" > Meta< / span > < span class = "p" > :< / span >
< span class = "n" > verbose_name_plural< / span > < span class = "o" > =< / span > < span class = "s" > ' simple categories' < / span >
< / pre > < / div >
< / td > < / tr > < / table > < / div >
< / li >
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< li > < p class = "first" > Create a subclass of CategoryBaseAdmin.< / p >
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10< / pre > < / div > < / td > < td class = "code" > < div class = "highlight" > < pre > < span class = "kn" > from< / span > < span class = "nn" > django.contrib< / span > < span class = "kn" > import< / span > < span class = "n" > admin< / span >
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< span class = "kn" > from< / span > < span class = "nn" > categories.admin< / span > < span class = "kn" > import< / span > < span class = "n" > CategoryBaseAdmin< / span >
< span class = "kn" > from< / span > < span class = "nn" > .models< / span > < span class = "kn" > import< / span > < span class = "n" > SimpleCategory< / span >
< span class = "k" > class< / span > < span class = "nc" > SimpleCategoryAdmin< / span > < span class = "p" > (< / span > < span class = "n" > CategoryBaseAdmin< / span > < span class = "p" > ):< / span >
< span class = "k" > pass< / span >
< span class = "n" > admin< / span > < span class = "o" > .< / span > < span class = "n" > site< / span > < span class = "o" > .< / span > < span class = "n" > register< / span > < span class = "p" > (< / span > < span class = "n" > SimpleCategory< / span > < span class = "p" > ,< / span > < span class = "n" > SimpleCategoryAdmin< / span > < span class = "p" > )< / span >
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< / pre > < / div >
< / td > < / tr > < / table > < / div >
< / li >
< li > < p class = "first" > Register your model and custom model admin class.< / p >
< / li >
< / ol >
< / div >
< div class = "section" id = "name-and-other-data" >
< h2 > Name and other data< a class = "headerlink" href = "#name-and-other-data" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > Sometimes you need more functionality, such as extra metadata and custom functions. The < a class = "reference internal" href = "reference/models.html#Category" title = "Category" > < tt class = "xref py py-class docutils literal" > < span class = "pre" > Category< / span > < / tt > < / a > model in this package does this.< / p >
< ol class = "arabic" >
< li > < p class = "first" > Create a model that subclasses < a class = "reference internal" href = "reference/models.html#CategoryBase" title = "CategoryBase" > < tt class = "xref py py-class docutils literal" > < span class = "pre" > CategoryBase< / span > < / tt > < / a > as above.< / p >
< / li >
< li > < p class = "first" > Add new fields to the model. The < a class = "reference internal" href = "reference/models.html#Category" title = "Category" > < tt class = "xref py py-class docutils literal" > < span class = "pre" > Category< / span > < / tt > < / a > model adds these extra fields.< / p >
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29< / pre > < / div > < / td > < td class = "code" > < div class = "highlight" > < pre > < span class = "k" > class< / span > < span class = "nc" > Category< / span > < span class = "p" > (< / span > < span class = "n" > CategoryBase< / span > < span class = "p" > ):< / span >
< span class = "n" > thumbnail< / span > < span class = "o" > =< / span > < span class = "n" > models< / span > < span class = "o" > .< / span > < span class = "n" > FileField< / span > < span class = "p" > (< / span >
< span class = "n" > upload_to< / span > < span class = "o" > =< / span > < span class = "n" > THUMBNAIL_UPLOAD_PATH< / span > < span class = "p" > ,< / span >
< span class = "n" > null< / span > < span class = "o" > =< / span > < span class = "bp" > True< / span > < span class = "p" > ,< / span > < span class = "n" > blank< / span > < span class = "o" > =< / span > < span class = "bp" > True< / span > < span class = "p" > ,< / span >
< span class = "n" > storage< / span > < span class = "o" > =< / span > < span class = "n" > STORAGE< / span > < span class = "p" > (),)< / span >
< span class = "n" > thumbnail_width< / span > < span class = "o" > =< / span > < span class = "n" > models< / span > < span class = "o" > .< / span > < span class = "n" > IntegerField< / span > < span class = "p" > (< / span > < span class = "n" > blank< / span > < span class = "o" > =< / span > < span class = "bp" > True< / span > < span class = "p" > ,< / span > < span class = "n" > null< / span > < span class = "o" > =< / span > < span class = "bp" > True< / span > < span class = "p" > )< / span >
< span class = "n" > thumbnail_height< / span > < span class = "o" > =< / span > < span class = "n" > models< / span > < span class = "o" > .< / span > < span class = "n" > IntegerField< / span > < span class = "p" > (< / span > < span class = "n" > blank< / span > < span class = "o" > =< / span > < span class = "bp" > True< / span > < span class = "p" > ,< / span > < span class = "n" > null< / span > < span class = "o" > =< / span > < span class = "bp" > True< / span > < span class = "p" > )< / span >
< span class = "n" > order< / span > < span class = "o" > =< / span > < span class = "n" > models< / span > < span class = "o" > .< / span > < span class = "n" > IntegerField< / span > < span class = "p" > (< / span > < span class = "n" > default< / span > < span class = "o" > =< / span > < span class = "mi" > 0< / span > < span class = "p" > )< / span >
< span class = "n" > alternate_title< / span > < span class = "o" > =< / span > < span class = "n" > models< / span > < span class = "o" > .< / span > < span class = "n" > CharField< / span > < span class = "p" > (< / span >
< span class = "n" > blank< / span > < span class = "o" > =< / span > < span class = "bp" > True< / span > < span class = "p" > ,< / span >
< span class = "n" > default< / span > < span class = "o" > =< / span > < span class = "s" > " " < / span > < span class = "p" > ,< / span >
< span class = "n" > max_length< / span > < span class = "o" > =< / span > < span class = "mi" > 100< / span > < span class = "p" > ,< / span >
< span class = "n" > help_text< / span > < span class = "o" > =< / span > < span class = "s" > " An alternative title to use on pages with this category." < / span > < span class = "p" > )< / span >
< span class = "n" > alternate_url< / span > < span class = "o" > =< / span > < span class = "n" > models< / span > < span class = "o" > .< / span > < span class = "n" > CharField< / span > < span class = "p" > (< / span >
< span class = "n" > blank< / span > < span class = "o" > =< / span > < span class = "bp" > True< / span > < span class = "p" > ,< / span >
< span class = "n" > max_length< / span > < span class = "o" > =< / span > < span class = "mi" > 200< / span > < span class = "p" > ,< / span >
< span class = "n" > help_text< / span > < span class = "o" > =< / span > < span class = "s" > " An alternative URL to use instead of the one derived from " < / span >
< span class = "s" > " the category hierarchy." < / span > < span class = "p" > )< / span >
< span class = "n" > description< / span > < span class = "o" > =< / span > < span class = "n" > models< / span > < span class = "o" > .< / span > < span class = "n" > TextField< / span > < span class = "p" > (< / span > < span class = "n" > blank< / span > < span class = "o" > =< / span > < span class = "bp" > True< / span > < span class = "p" > ,< / span > < span class = "n" > null< / span > < span class = "o" > =< / span > < span class = "bp" > True< / span > < span class = "p" > )< / span >
< span class = "n" > meta_keywords< / span > < span class = "o" > =< / span > < span class = "n" > models< / span > < span class = "o" > .< / span > < span class = "n" > CharField< / span > < span class = "p" > (< / span >
< span class = "n" > blank< / span > < span class = "o" > =< / span > < span class = "bp" > True< / span > < span class = "p" > ,< / span >
< span class = "n" > default< / span > < span class = "o" > =< / span > < span class = "s" > " " < / span > < span class = "p" > ,< / span >
< span class = "n" > max_length< / span > < span class = "o" > =< / span > < span class = "mi" > 255< / span > < span class = "p" > ,< / span >
< span class = "n" > help_text< / span > < span class = "o" > =< / span > < span class = "s" > " Comma-separated keywords for search engines." < / span > < span class = "p" > )< / span >
< span class = "n" > meta_extra< / span > < span class = "o" > =< / span > < span class = "n" > models< / span > < span class = "o" > .< / span > < span class = "n" > TextField< / span > < span class = "p" > (< / span >
< span class = "n" > blank< / span > < span class = "o" > =< / span > < span class = "bp" > True< / span > < span class = "p" > ,< / span >
< span class = "n" > default< / span > < span class = "o" > =< / span > < span class = "s" > " " < / span > < span class = "p" > ,< / span >
< span class = "n" > help_text< / span > < span class = "o" > =< / span > < span class = "s" > " (Advanced) Any additional HTML to be placed verbatim " < / span >
< span class = "s" > " in the & lt;head& gt;" < / span > < span class = "p" > )< / span >
< / pre > < / div >
< / td > < / tr > < / table > < / div >
< / li >
< li > < p class = "first" > Add new methods to the model. For example, the < a class = "reference internal" href = "reference/models.html#Category" title = "Category" > < tt class = "xref py py-class docutils literal" > < span class = "pre" > Category< / span > < / tt > < / a > model adds several new methods, including overriding the < tt class = "xref py py-meth docutils literal" > < span class = "pre" > save()< / span > < / tt > method.< / p >
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15< / pre > < / div > < / td > < td class = "code" > < div class = "highlight" > < pre > < span class = "k" > def< / span > < span class = "nf" > save< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "p" > ,< / span > < span class = "o" > *< / span > < span class = "n" > args< / span > < span class = "p" > ,< / span > < span class = "o" > **< / span > < span class = "n" > kwargs< / span > < span class = "p" > ):< / span >
< span class = "k" > if< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > thumbnail< / span > < span class = "p" > :< / span >
< span class = "kn" > from< / span > < span class = "nn" > django.core.files.images< / span > < span class = "kn" > import< / span > < span class = "n" > get_image_dimensions< / span >
< span class = "kn" > import< / span > < span class = "nn" > django< / span >
< span class = "k" > if< / span > < span class = "n" > django< / span > < span class = "o" > .< / span > < span class = "n" > VERSION< / span > < span class = "p" > [< / span > < span class = "mi" > 1< / span > < span class = "p" > ]< / span > < span class = "o" > < < / span > < span class = "mi" > 2< / span > < span class = "p" > :< / span >
< span class = "n" > width< / span > < span class = "p" > ,< / span > < span class = "n" > height< / span > < span class = "o" > =< / span > < span class = "n" > get_image_dimensions< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > thumbnail< / span > < span class = "o" > .< / span > < span class = "n" > file< / span > < span class = "p" > )< / span >
< span class = "k" > else< / span > < span class = "p" > :< / span >
< span class = "n" > width< / span > < span class = "p" > ,< / span > < span class = "n" > height< / span > < span class = "o" > =< / span > < span class = "n" > get_image_dimensions< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > thumbnail< / span > < span class = "o" > .< / span > < span class = "n" > file< / span > < span class = "p" > ,< / span > < span class = "n" > close< / span > < span class = "o" > =< / span > < span class = "bp" > True< / span > < span class = "p" > )< / span >
< span class = "k" > else< / span > < span class = "p" > :< / span >
< span class = "n" > width< / span > < span class = "p" > ,< / span > < span class = "n" > height< / span > < span class = "o" > =< / span > < span class = "bp" > None< / span > < span class = "p" > ,< / span > < span class = "bp" > None< / span >
< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > thumbnail_width< / span > < span class = "o" > =< / span > < span class = "n" > width< / span >
< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > thumbnail_height< / span > < span class = "o" > =< / span > < span class = "n" > height< / span >
< span class = "nb" > super< / span > < span class = "p" > (< / span > < span class = "n" > Category< / span > < span class = "p" > ,< / span > < span class = "bp" > self< / span > < span class = "p" > )< / span > < span class = "o" > .< / span > < span class = "n" > save< / span > < span class = "p" > (< / span > < span class = "o" > *< / span > < span class = "n" > args< / span > < span class = "p" > ,< / span > < span class = "o" > **< / span > < span class = "n" > kwargs< / span > < span class = "p" > )< / span >
< / pre > < / div >
< / td > < / tr > < / table > < / div >
< / li >
< li > < p class = "first" > Alter < tt class = "xref py py-class docutils literal" > < span class = "pre" > Meta< / span > < / tt > or < tt class = "xref py py-class docutils literal" > < span class = "pre" > MPTTMeta< / span > < / tt > class. Either of these inner classes can be overridden, however your < tt class = "xref py py-class docutils literal" > < span class = "pre" > Meta< / span > < / tt > class should inherit < tt class = "xref py py-class docutils literal" > < span class = "pre" > CategoryBase.Meta< / span > < / tt > . Options for < tt class = "xref py py-class docutils literal" > < span class = "pre" > Meta< / span > < / tt > are in the < a class = "reference external" href = "http://readthedocs.org/docs/django-mptt/en/latest/models.html#model-options" > Django-MPTT docs< / a > .< / p >
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5< / pre > < / div > < / td > < td class = "code" > < div class = "highlight" > < pre > < span class = "k" > class< / span > < span class = "nc" > Meta< / span > < span class = "p" > (< / span > < span class = "n" > CategoryBase< / span > < span class = "o" > .< / span > < span class = "n" > Meta< / span > < span class = "p" > ):< / span >
< span class = "n" > verbose_name_plural< / span > < span class = "o" > =< / span > < span class = "s" > ' categories' < / span >
< span class = "k" > class< / span > < span class = "nc" > MPTTMeta< / span > < span class = "p" > :< / span >
< span class = "n" > order_insertion_by< / span > < span class = "o" > =< / span > < span class = "p" > (< / span > < span class = "s" > ' order' < / span > < span class = "p" > ,< / span > < span class = "s" > ' name' < / span > < span class = "p" > )< / span >
< / pre > < / div >
< / td > < / tr > < / table > < / div >
< / li >
< li > < p class = "first" > For the admin, you must create a form that subclasses < tt class = "xref py py-class docutils literal" > < span class = "pre" > CategoryBaseAdminForm< / span > < / tt > and at least sets the < tt class = "docutils literal" > < span class = "pre" > Meta.model< / span > < / tt > attribute. You can also alter the form fields and cleaning methods, as < a class = "reference internal" href = "reference/models.html#Category" title = "Category" > < tt class = "xref py py-class docutils literal" > < span class = "pre" > Category< / span > < / tt > < / a > does.< / p >
< div class = "highlight-python" > < table class = "highlighttable" > < tr > < td class = "linenos" > < div class = "linenodiv" > < pre > 1
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9< / pre > < / div > < / td > < td class = "code" > < div class = "highlight" > < pre > < span class = "k" > class< / span > < span class = "nc" > CategoryAdminForm< / span > < span class = "p" > (< / span > < span class = "n" > CategoryBaseAdminForm< / span > < span class = "p" > ):< / span >
< span class = "k" > class< / span > < span class = "nc" > Meta< / span > < span class = "p" > :< / span >
< span class = "n" > model< / span > < span class = "o" > =< / span > < span class = "n" > Category< / span >
< span class = "k" > def< / span > < span class = "nf" > clean_alternate_title< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "p" > ):< / span >
< span class = "k" > if< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > instance< / span > < span class = "ow" > is< / span > < span class = "bp" > None< / span > < span class = "ow" > or< / span > < span class = "ow" > not< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > cleaned_data< / span > < span class = "p" > [< / span > < span class = "s" > ' alternate_title' < / span > < span class = "p" > ]:< / span >
< span class = "k" > return< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > cleaned_data< / span > < span class = "p" > [< / span > < span class = "s" > ' name' < / span > < span class = "p" > ]< / span >
< span class = "k" > else< / span > < span class = "p" > :< / span >
< span class = "k" > return< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > cleaned_data< / span > < span class = "p" > [< / span > < span class = "s" > ' alternate_title' < / span > < span class = "p" > ]< / span >
< / pre > < / div >
< / td > < / tr > < / table > < / div >
< / li >
< li > < p class = "first" > Next you must subclass < tt class = "xref py py-class docutils literal" > < span class = "pre" > CategoryBaseAdmin< / span > < / tt > and assign the < tt class = "docutils literal" > < span class = "pre" > form< / span > < / tt > attribute the form class created above. You can alter any other attributes as necessary.< / p >
< div class = "highlight-python" > < table class = "highlighttable" > < tr > < td class = "linenos" > < div class = "linenodiv" > < pre > 1
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17< / pre > < / div > < / td > < td class = "code" > < div class = "highlight" > < pre > < span class = "k" > class< / span > < span class = "nc" > CategoryAdmin< / span > < span class = "p" > (< / span > < span class = "n" > CategoryBaseAdmin< / span > < span class = "p" > ):< / span >
< span class = "n" > form< / span > < span class = "o" > =< / span > < span class = "n" > CategoryAdminForm< / span >
< span class = "n" > list_display< / span > < span class = "o" > =< / span > < span class = "p" > (< / span > < span class = "s" > ' name' < / span > < span class = "p" > ,< / span > < span class = "s" > ' alternate_title' < / span > < span class = "p" > ,< / span > < span class = "s" > ' active' < / span > < span class = "p" > )< / span >
< span class = "n" > fieldsets< / span > < span class = "o" > =< / span > < span class = "p" > (< / span >
< span class = "p" > (< / span > < span class = "bp" > None< / span > < span class = "p" > ,< / span > < span class = "p" > {< / span >
< span class = "s" > ' fields' < / span > < span class = "p" > :< / span > < span class = "p" > (< / span > < span class = "s" > ' parent' < / span > < span class = "p" > ,< / span > < span class = "s" > ' name' < / span > < span class = "p" > ,< / span > < span class = "s" > ' thumbnail' < / span > < span class = "p" > ,< / span > < span class = "s" > ' active' < / span > < span class = "p" > )< / span >
< span class = "p" > }),< / span >
< span class = "p" > (< / span > < span class = "s" > ' Meta Data' < / span > < span class = "p" > ,< / span > < span class = "p" > {< / span >
< span class = "s" > ' fields' < / span > < span class = "p" > :< / span > < span class = "p" > (< / span > < span class = "s" > ' alternate_title' < / span > < span class = "p" > ,< / span > < span class = "s" > ' alternate_url' < / span > < span class = "p" > ,< / span > < span class = "s" > ' description' < / span > < span class = "p" > ,< / span >
< span class = "s" > ' meta_keywords' < / span > < span class = "p" > ,< / span > < span class = "s" > ' meta_extra' < / span > < span class = "p" > ),< / span >
< span class = "s" > ' classes' < / span > < span class = "p" > :< / span > < span class = "p" > (< / span > < span class = "s" > ' collapse' < / span > < span class = "p" > ,),< / span >
< span class = "p" > }),< / span >
< span class = "p" > (< / span > < span class = "s" > ' Advanced' < / span > < span class = "p" > ,< / span > < span class = "p" > {< / span >
< span class = "s" > ' fields' < / span > < span class = "p" > :< / span > < span class = "p" > (< / span > < span class = "s" > ' order' < / span > < span class = "p" > ,< / span > < span class = "s" > ' slug' < / span > < span class = "p" > ),< / span >
< span class = "s" > ' classes' < / span > < span class = "p" > :< / span > < span class = "p" > (< / span > < span class = "s" > ' collapse' < / span > < span class = "p" > ,),< / span >
< span class = "p" > }),< / span >
< span class = "p" > )< / span >
< / pre > < / div >
< / td > < / tr > < / table > < / div >
< / li >
< / ol >
< / div >
< / div >
< / div >
< / div >
< / div >
< div class = "footer" >
< p >
© Copyright 2010-2012, Corey Oordt.
2012-07-12 23:31:27 +00:00
Created using < a href = "http://sphinx.pocoo.org/" > Sphinx< / a > 1.0.7.
2012-02-08 16:23:58 +00:00
< / p >
< / div >
< div class = "clearer" > < / div >
< / div >
< div id = "breadcrumbs" >
Creating Custom Categories
< / ul >
< / div >
< script type = "text/javascript" charset = "utf-8" src = "_static/toc.js" > < / script >
< / body >
< / html >
