more work on paginators

app/logical/post_sets/favorite.rb

@@ -0,0 +1,24 @@
+module PostSets
+  class Favorite < Base
+    attr_reader :user, :page, :favorites, :posts
+    
+    def initialize(params)
+      @user = ::User.find(params[:id])
+      @page = [params[:page].to_i, 1].max
+      @favorites = ::Favorite.model_for(@user.id).for_user(@user.id).paginate(page)
+      @posts = ::Post.where("id in (?)", post_ids).order(arbitrary_sql_order_clause(post_ids, "posts")).paginate("a0")
+    end
+    
+    def post_ids
+      @post_ids ||= favorites.map(&:post_id)
+    end
+    
+    def offset
+      (page - 1) * records_per_page
+    end
+    
+    def tag_string
+      @tag_string ||= "fav:#{user.name}"
+    end
+  end
+end