first version of multi categories and tags

app/models/page.rb

@@ -8,8 +8,8 @@ class Page < Item
   field :content, localize: true
   field :app_frontend_url
   field :theme_id, :type => BSON::ObjectId, :default => nil
-  field :category, :default => ''
-  field :tag, :default => ''
+  field :category,type: Array, :default => []
+  field :tag, type: Array,:default => []
   field :view_count, :type => Integer, :default => 0
   field :page_title, localize: true
   

app/models/page_part.rb

@@ -11,6 +11,8 @@ class PagePart
   field :public_r_tag_option, :default => nil
   field :page_title, localize: true
   field :widget_path
+  field :category,type: Array, :default => []
+  field :tag, type: Array,:default => []
   
   field :widget_style
   field :widget_field , :type => Array