Try something like:
posts = Post.find(:all, :conditions => "title like 'ibovespa%'",
:include => :categories)
all_categories = posts.map {|p| p.categories}.flatten.uniq
:lachie
http://smartbomb.com.au
http://www.flickr.com/photos/lachie/
On Thu, Jan 15, 2009 at 4:54 AM, sohdubom <[email protected]> wrote:
>
> Hi, suppose I have the classic Post, Categorization and Category
> models example, normalized via join model Categorization in a
> has_many_through relationship. If I do:
>
> 1. pst1 = Post.find(:all, :conditions => "title like 'ibovespa%'")
> then pst1 will be an array, because find(:all...) returns an array,
> although in this case it's an array of only 1 object
>
> 2. pst2 = Post.find(1)
> then pst2 will be a single object
>
> In order to find which categories a single post belongs to I could
> think of doing:
>
> cats = pst2.categories and pst1.categories will no work because it's
> an array, right?
>
> Is there a way to still use pst1 to find its categories?
>
>
> >
>
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