major refactoring of post sets and pagination, incomplete

app/logical/post_sets/numbered.rb

@@ -0,0 +1,35 @@
+module PostSets
+  module Numbered
+    attr_reader :page
+    
+    def initialize(params)
+      super
+      @page = options[:page] ? options[:page].to_i : 1
+    end
+
+    def total_pages
+      @total_pages ||= (count / limit.to_f).ceil.to_i
+    end
+    
+    def reload
+      super
+      @total_pages = nil
+    end
+    
+    def slice(relation)
+      relation.offset(offset).all
+    end
+    
+    def pagination_options
+      {:offset => offset}
+    end
+    
+    def is_first_page?
+      offset == 0
+    end
+    
+    def offset
+      ((page < 1) ? 0 : (page - 1)) * limit
+    end
+  end
+end