Rails - Jul 2006 - Newbie: Display hierarchical Records in a view

Hi,

I have two models: category and subcategory. (one to many
relationship), and a controller ''home''

I''d like to display all the categories and their sub categories in the
view: home\index.rhtml.

I have a method in the ''home'' controller'' like this:
def list_categories
    @categories = Category.find(:all)
 end

This list all the categories on a view, but I don''t know how to get
all the sub categories that belong to their parent category. I''d like
to display them like this in home\index.rhtml:

Category 2
* subCategory 1
* subCategory 2

Category 2
* subCategory 3
* subCategory 4

Could anybody help me on this one? Thanks in advance!

-- 
Best regards,

Ming Ma

Ming Ma wrote:
> Hi,
> 
> I have two models: category and subcategory. (one to many
> relationship), and a controller ''home''
> 
> I''d like to display all the categories and their sub categories in
the
> view: home\index.rhtml.
> 
> I have a method in the ''home'' controller'' like
this:
> def list_categories
>     @categories = Category.find(:all)
>  end
> 
> This list all the categories on a view, but I don''t know how to
get
> all the sub categories that belong to their parent category. I''d
like
> to display them like this in home\index.rhtml:
> 
> Category 2
> * subCategory 1
> * subCategory 2
> 
> Category 2
> * subCategory 3
> * subCategory 4
> 
> Could anybody help me on this one? Thanks in advance!
> 
> --
> Best regards,
> 
> Ming Ma
Ming,

You can access the subcategories directly from the category.

something like

for subcategory in @category.subcategories  ...

should give you what you are looking for.

Regards,

Michael

mmodica at cox dot net

-- 
Posted via http://www.ruby-forum.com/.

On 23-Jul-06, at 6:54 AM, Ming Ma wrote:
> I''d like to display all the categories and their sub categories in
the
> view: home\index.rhtml.
You can access a category''s children through the category itself.  
Pretend we''re on the console:

Category.find(:first).subcategories

The above will return an array of all the subcategory objects for  
the :first category.

So, in home/index.rhtml

<% @categories.each do |category| %>
   <%= category.name %>
   <% category.subcategories.each do |subcategory| %>
     <%= subcategory.name %>
   <% end %>
<% end %>

HTH

/Jeff


--
http://re.visioni.st
http://quotedprintable.com

Thank you very much guys!

On 7/24/06, Jeffrey Hardy <packagethief@gmail.com>
wrote:
> On 23-Jul-06, at 6:54 AM, Ming Ma wrote:
> > I''d like to display all the categories and their sub
categories in the
> > view: home\index.rhtml.
>
> You can access a category''s children through the category itself.
> Pretend we''re on the console:
>
> Category.find(:first).subcategories
>
> The above will return an array of all the subcategory objects for
> the :first category.
>
> So, in home/index.rhtml
>
> <% @categories.each do |category| %>
>    <%= category.name %>
>    <% category.subcategories.each do |subcategory| %>
>      <%= subcategory.name %>
>    <% end %>
> <% end %>
>
> HTH
>
> /Jeff
>
>
> --
> http://re.visioni.st
> http://quotedprintable.com
>
>
>
> _______________________________________________
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>

-- 
Best regards,

Ming Ma