1 files changed, 7 insertions, 1 deletions
diff --git a/activemodel/lib/active_model/errors.rb b/activemodel/lib/active_model/errors.rb
index 36819553ee..843c0c3cb5 100644
--- a/activemodel/lib/active_model/errors.rb
+++ b/activemodel/lib/active_model/errors.rb
@@ -63,7 +63,7 @@ module ActiveModel
   class Errors
     include Enumerable
 
-    CALLBACKS_OPTIONS = [:if, :unless, :on, :allow_nil, :allow_blank]
+    CALLBACKS_OPTIONS = [:if, :unless, :on, :allow_nil, :allow_blank, :strict]
 
     attr_reader :messages
 
@@ -218,6 +218,9 @@ module ActiveModel
       elsif message.is_a?(Proc)
         message = message.call
       end
+      if options[:strict]
+        raise ActiveModel::StrictValidationFailed,  message
+      end
 
       self[attribute] << message
     end
@@ -319,4 +322,7 @@ module ActiveModel
       I18n.translate(key, options)
     end
   end
+
+  class StrictValidationFailed < StandardError
+  end
 end