fixing warnings

app/models/report/operator.rb

@@ -240,9 +240,9 @@ class Report::Operator
     validation_methods = values.delete(:validate)
     register_validations(validation_methods) unless validation_methods.nil?
     values.each do |key, value|
-      metaclass.class_eval { define_method(key) { value } }
+      singleton_class.class_eval { define_method(key) { value } }
     end
-    metaclass.class_eval(&block) if block
+    singleton_class.class_eval(&block) if block
   end
 
   def to_operator

app/models/report/validation.rb

@@ -9,7 +9,7 @@ module Report::Validation
     const_name = val_method.to_s.camelize
     begin
       val_module = Report::Validation.const_get const_name
-      metaclass.send(:include, val_module)
+      singleton_class.send(:include, val_module)
       val_method = "validate_" + val_method.to_s.pluralize
       if method(val_method)
         validations << val_method