fix cates and tags

app/controllers/application_controller.rb

@@ -234,7 +234,13 @@ class ApplicationController < ActionController::Base
     ret = ''
     ret << "/panel/#{@item.module_app.key}/front_end/#{@item.app_frontend_url}.rss"
     ret << "/#{params[:id]}" if params[:id] && !params[:id].eql?(@item.id.to_s)
-    ret << "?inner=true&category_id=#{params[:category]}&tag_id=#{params[:tag]}&page_main=#{params[:page_main]}"
+
+    categories_str=params[:category].collect{|t| "category_id[]=#{t}"}.join('&')
+    tags_str=params[:tag].collect{|t| "tag_id[]=#{t}"}.join('&')
+    categories_str = "&#{categories_str}" unless categories_str.blank?
+    tags_str = "&#{tags_str}" unless tags_str.blank?
+
+    ret << "?inner=true#{categories_str}#{tags_str}&page_main=#{params[:page_main]}"
     redirect_to ret
   end