Hey, I have a forum and at the bottom of each page of the current topic I have a form to add a reply. I am using the following pagination to display 20 posts per topic per page... page = (params[:page] ||= 1).to_i posts_per_page = 20 offset = (page - 1) * posts_per_page @posts = Post.find(:all, :conditions => ["topic_id = ?", params[:id]], :order => "created_on DESC") @post_pages = Paginator.new(self, @posts.length, posts_per_page, page) @posts = @posts[offset..(offset + posts_per_page - 1)] My question is: When a user adds a reply, I want to then redirect that person to the last page of posts (which is where their reply will have been added) Any ideas how i could go about this? Thanks!!
on 2007-01-06 23:01
on 2007-01-07 20:11
Scott Holland wrote: > last page of posts (which is where their reply will have been added) > Any ideas how i could go about this? Pagination is a highly debated topic with several ways of implementing it. While it may be better to use one of the pagination plugins, here is a suggestion based on your current implementation. To get the number of total posts, use: Posts.count - your current code selects every single post from the database on a request to that action, which is inefficient and will not scale. You could support a custom ?page=last parameter. total = Post.count limit = 20 page = params[:page] || 1 page = (total.to_f / limit).ceil if page == "last" @posts = Topic.find(params[:id]).posts.find(all, :limit => limit, :offset => (page.to_i-1)*limit, :order => "created_on DESC") @post_pages = Paginator.new(self, total, limit, page.to_i) I'm not sure this is the cleanest way to implement what you want, but it will work. redirect_to :controller => 'posts', :action => 'list', :page => 'last' Dan Manges
on 2007-01-09 12:48
Hey, Thanks for that. I'll give it a go. I never actually thought about pagination plugins. Are there any you would recommended? Scott
on 2007-01-09 14:47
question about pagination and how it does not scale well, what size recordset will pagination start being a problem? < 1000, > 2000, a few hundred? or are we talking 10k and above?