Fixed bug when error message is an empty string.

2 files changed, 8 insertions, 1 deletions

diff --git a/activemodel/lib/active_model/errors.rb b/activemodel/lib/active_model/errors.rb
index 8337b04c0d..aafd1c8a74 100644
--- a/activemodel/lib/active_model/errors.rb
+++ b/activemodel/lib/active_model/errors.rb
@@ -176,8 +176,9 @@ module ActiveModel
     end
 
     # Returns true if no errors are found, false otherwise.
+    # If the error message is a string it can be empty.
     def empty?
-      all? { |k, v| v && v.empty? }
+      all? { |k, v| v && v.empty? && !v.is_a?(String) }
     end
     alias_method :blank?, :empty?
 
diff --git a/activemodel/test/cases/validations/validates_test.rb b/activemodel/test/cases/validations/validates_test.rb
index 779f6c8448..ad3be4a3c1 100644
--- a/activemodel/test/cases/validations/validates_test.rb
+++ b/activemodel/test/cases/validations/validates_test.rb
@@ -16,6 +16,12 @@ class ValidatesTest < ActiveModel::TestCase
     PersonWithValidator.reset_callbacks(:validate)
   end
 
+  def test_validates_with_messages_empty
+    Person.validates :title, :presence => {:message => "" }
+    person = Person.new(:title => '')
+    assert !person.valid?, 'person should not be valid.'
+  end
+
   def test_validates_with_built_in_validation
     Person.validates :title, :numericality => true
     person = Person.new