Add validators reflection so you can do 'Person.validators' and 'Person.validators_on(:name)'.

Signed-off-by: José Valim <jose.valim@gmail.com>

2 files changed, 28 insertions, 0 deletions

diff --git a/activemodel/test/cases/validations/with_validation_test.rb b/activemodel/test/cases/validations/with_validation_test.rb
index 66b072ea38..92df4dd6cd 100644
--- a/activemodel/test/cases/validations/with_validation_test.rb
+++ b/activemodel/test/cases/validations/with_validation_test.rb
@@ -9,6 +9,7 @@ class ValidatesWithTest < ActiveRecord::TestCase
 
   def teardown
     Topic.reset_callbacks(:validate)
+    Topic._validators.clear
   end
 
   ERROR_MESSAGE = "Validation error from validator"
diff --git a/activemodel/test/cases/validations_test.rb b/activemodel/test/cases/validations_test.rb
index eb100d1c35..9fedd84c73 100644
--- a/activemodel/test/cases/validations_test.rb
+++ b/activemodel/test/cases/validations_test.rb
@@ -10,6 +10,10 @@ require 'models/custom_reader'
 class ValidationsTest < ActiveModel::TestCase
   include ActiveModel::TestsDatabase
 
+  def setup
+    Topic._validators.clear
+  end
+
   # Most of the tests mess with the validations of Topic, so lets repair it all the time.
   # Other classes we mess with will be dealt with in the specific tests
   def teardown
@@ -220,4 +224,27 @@ class ValidationsTest < ActiveModel::TestCase
     assert !t.valid?
     assert ["NO BLANKS HERE"], t.errors[:title]
   end
+
+  def test_list_of_validators_for_model
+    Topic.validates_presence_of :title
+    Topic.validates_length_of :title, :minimum => 2
+
+    assert_equal 2, Topic.validators.count
+    assert_equal [:presence, :length], Topic.validators.map(&:kind)
+  end
+
+  def test_list_of_validators_on_an_attribute
+    Topic.validates_presence_of :title, :content
+    Topic.validates_length_of :title, :minimum => 2
+
+    assert_equal 2, Topic.validators_on(:title).count
+    assert_equal [:presence, :length], Topic.validators_on(:title).map(&:kind)
+    assert_equal 1, Topic.validators_on(:content).count
+    assert_equal [:presence], Topic.validators_on(:content).map(&:kind)
+  end
+
+  def test_accessing_instance_of_validator_on_an_attribute
+    Topic.validates_length_of :title, :minimum => 10
+    assert_equal 10, Topic.validators_on(:title).first.options[:minimum]
+  end
 end