On May 11, 9:32 am, Colin Law <[email protected]> wrote: > On 11 May 2010 13:43, David Zhu <[email protected]> wrote: > > > i need a join table? is the join table my comments table? > > It already is a join table, you just need to tell rails that it can > use it as such. > > By the way could you not top post (so insert your comments at the > appropriate point in the email you are replying to instead, as I have > done here)? It makes it easier to follow the thread. For example > your mail just says "I need a join table? .." but it is not at all > clear what this is in reply to. > > Thanks > > Colin > > > > > > > On May 11, 8:36 am, Colin Law <[email protected]> wrote: > >> 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 > > >> > -- > >> > You received this message because you are subscribed to the Google > >> > Groups "Ruby on Rails: Talk" group. > >> > To post to this group, send email to [email protected]. > >> > To unsubscribe from this group, send email to > >> > [email protected]. > >> > For more options, visit this group > >> > athttp://groups.google.com/group/rubyonrails-talk?hl=en. > > >> -- > >> You received this message because you are subscribed to the Google Groups > >> "Ruby on Rails: Talk" group. > >> To post to this group, send email to [email protected]. > >> To unsubscribe from this group, send email to > >> [email protected]. > >> For more options, visit this group > >> athttp://groups.google.com/group/rubyonrails-talk?hl=en.-Hide quoted text - > > >> - Show quoted text - > > > -- > > You received this message because you are subscribed to the Google Groups > > "Ruby on Rails: Talk" group. > > To post to this group, send email to [email protected]. > > To unsubscribe from this group, send email to > > [email protected]. > > For more options, visit this group > > athttp://groups.google.com/group/rubyonrails-talk?hl=en. > > -- > You received this message because you are subscribed to the Google Groups > "Ruby on Rails: Talk" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group > athttp://groups.google.com/group/rubyonrails-talk?hl=en.
Ok Colin, about not top posting, is this top posting? -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
