category disable for backend

lib/orbit_core_lib.rb

@@ -5,13 +5,24 @@ module  OrbitCoreLib
       base.instance_eval("field :disable,type: Boolean,:default => false")
       base.instance_eval("scope :all,where(disable: false)")
       base.instance_eval("scope :admin_manager_all,find(:all)")
+      
       base.define_singleton_method :find do |*args|
         if args ==[:all]
           unscoped
         else
-          unscoped.find(args) 
+          res = unscoped.find(args) 
+          res.count == 1 ? res[0] : res
         end
       end
+
+      base.define_singleton_method :first do |*args|
+        all.first
+      end
+
+      base.define_singleton_method :last do |*args|
+        all.last
+      end
+
     end
   end
   module  ObjectAuthable