On 11 May 2010 13:32, David Zhu <[email protected]> wrote:
> Oh ok thanks!
>
> But just to make sure we are on the same page-
>
> Page has many comments
> Comments has many Davids
I believe that if you also say Page has_many davids through comments
then you can get at all the davids for a post by
@post.davids
and hence you can use @posts.davids.count
Colin
>
> Would
>
> @davidcount = Post.comments.map {|comment| comment.davids.count}.sum
>
> find out how many David's are in a certain Post?
>
> Just to clarify, im not trying to find All of the David's that exsit
> in the entire database, just the amount of Davids that belongs to the
> post. But the part i dont understand is how to count up the David's
> that belongs to that Post, because there are comments in between.
> (post has many comments, comments has many davids) And i want to find
> out for a certain post (@post) how many davds belongs to it)
>
> So would @davidcount = Post.comments.map {|comment|
> comment.davids.count}.sum work for something like that?
>
>
> Thank you
>
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