* set server_id to be same as hostname

ruby/lib/jam_ruby/models/icecast_server.rb

@@ -38,10 +38,15 @@ module JamRuby
     validates :template, presence: true
     validates :mount_template, presence: true
 
+    before_validation :before_validate
     before_save :before_save, unless: lambda { skip_config_changed_flag }
     before_save :sanitize_active_admin
     after_save  :after_save
 
+    def before_validate
+      self.server_id = self.hostname
+    end
+
     def before_save
         self.config_changed = 1
     end