Newbie: Display hierarchical Records in a view

Rails
1

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

2

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

3

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

4

Thank you very much guys!

On 7/24/06, Jeffrey H. [email protected] wrote:

the :first category.
HTH

Rails mailing list
[email protected]
http://lists.rubyonrails.org/mailman/listinfo/rails

–
Best regards,

Ming Ma