Rails - Feb 2010 - Need help understanding how to sort and view items through categories

This is probably an easy guess for some, but after searching the web
for quite some time, I''ve concluded that I need help understanding
this.

My case:

I''m creating an ad application where people can sell and buy items
through their own ads. An ad belongs to one category, and therefore
the question: When a user views all the current ads as a list
(webisteurl/ads) - how do I make the categories show up next to that
list like a clickable sorting menu?

Help would be very much appreciated!

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>
> This is probably an easy guess for some, but after searching the web
> for quite some time, I''ve concluded that I need help understanding
> this.
>
> My case:
>
> I''m creating an ad application where people can sell and buy items
> through their own ads. An ad belongs to one category, and therefore
> the question: When a user views all the current ads as a list
> (webisteurl/ads) - how do I make the categories show up next to that
> list like a clickable sorting menu?
>
I''m not 100% sure which part you''re stuck on.  To get the
association set up
you need to look in to ActiveRecord Relationships, in particular
has_and_belongs_to_many.

class Advert < ActiveRecord::Base
  has_and_belongs_to_many :categories
end

Then in the view do something along the lines of:

...<%= @advert.content %>...

<ul>
  <% for category in @advert.categories %>
    <li><%= link_to category.name, category_path(category)
%></li>
  <% end %>
</ul>

You''d have a category controller; maybe using restful routes or a named
route such as:

map.category "/category/:id", :controller =>
"categories", :action => "show"

In that controller you''d do:

@articles.find_by_category(params[:id])

And iterate over those articles in the view.

Depending on where you were stuck, hopefully that''s given you some
hints to
get you moving.  If not, post back with more details.

Cheers,


Andy

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It helped quite a bit actually. Thanks!

On Feb 22, 10:20 pm, Andy Jeffries
<andyjeffr...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> > This is probably an easy guess for some, but after searching the web
> > for quite some time, I''ve concluded that I need help
understanding
> > this.
>
> > My case:
>
> > I''m creating an ad application where people can sell and buy
items
> > through their own ads. An ad belongs to one category, and therefore
> > the question: When a user views all the current ads as a list
> > (webisteurl/ads) - how do I make the categories show up next to that
> > list like a clickable sorting menu?
>
> I''m not 100% sure which part you''re stuck on.  To get the
association set up
> you need to look in to ActiveRecord Relationships, in particular
> has_and_belongs_to_many.
>
> class Advert < ActiveRecord::Base
>   has_and_belongs_to_many :categories
> end
>
> Then in the view do something along the lines of:
>
> ...<%= @advert.content %>...
>
> <ul>
>   <% for category in @advert.categories %>
>     <li><%= link_to category.name, category_path(category)
%></li>
>   <% end %>
> </ul>
>
> You''d have a category controller; maybe using restful routes or a
named
> route such as:
>
> map.category "/category/:id", :controller =>
"categories", :action => "show"
>
> In that controller you''d do:
>
> @articles.find_by_category(params[:id])
>
> And iterate over those articles in the view.
>
> Depending on where you were stuck, hopefully that''s given you some
hints to
> get you moving.  If not, post back with more details.
>
> Cheers,
>
> Andy
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