Change the design for the whole site form designs index

app/models/design/design.rb

@@ -10,6 +10,7 @@ class Design
 
   mount_uploader :zip_file, AssetUploader
 
+  has_one :site
   has_one :css_default, as: :css, :autosave => true, :dependent => :destroy
   has_one :layout, :autosave => true, :dependent => :destroy
   has_one :css_reset, :autosave => true, :dependent => :destroy

app/models/site.rb

@@ -26,6 +26,7 @@ class Site
   field :footer, localize: true
   field :sub_menu, localize: true
   
+  belongs_to :design
   has_many :site_metas, :autosave => true, :dependent => :destroy
 
   def generate_keys