rails中的常用分页一

snippets.dzone.com/posts/show/389

Sometimes it's nearly impossible to paginate a result set using the built-in :limit and :offset parameters of find(:all). Instead, you can fetch a complicated query and paginate the results afterward.

Add the following to application.rb:

ruby 代码

def paginate_collection(collection, options = {})
   default_options = {:per_page => 10, :page => 1}
   options = default_options.merge options

   pages = Paginator.new self, collection.size, options[:per_page], options[:page]
   first = pages.current.offset
   last = [first + options[:per_page], collection.size].min
   slice = collection[first...last]
   return [pages, slice]
 end

Call it from within your action like this:

ruby 代码

@pages, @users = paginate_collection User.find_custom_query, :page => @params[:page]