Add ActiveModel::Errors#delete, which was not available after move to use delegation

2 files changed, 12 insertions, 0 deletions

diff --git a/activemodel/lib/active_model/errors.rb b/activemodel/lib/active_model/errors.rb
index aafd1c8a74..3d814b4870 100644
--- a/activemodel/lib/active_model/errors.rb
+++ b/activemodel/lib/active_model/errors.rb
@@ -100,6 +100,11 @@ module ActiveModel
       messages[key] = value
     end
 
+    # Delete messages for +key+
+    def delete(key)
+      messages.delete(key)
+    end
+
     # When passed a symbol or a name of a method, returns an array of errors
     # for the method.
     #
diff --git a/activemodel/test/cases/errors_test.rb b/activemodel/test/cases/errors_test.rb
index 8ddedb160a..4edeece3e8 100644
--- a/activemodel/test/cases/errors_test.rb
+++ b/activemodel/test/cases/errors_test.rb
@@ -27,6 +27,13 @@ class ErrorsTest < ActiveModel::TestCase
     end
   end
 
+  def test_delete
+    errors = ActiveModel::Errors.new(self)
+    errors[:foo] = 'omg'
+    errors.delete(:foo)
+    assert_empty errors[:foo]
+  end
+
   def test_include?
     errors = ActiveModel::Errors.new(self)
     errors[:foo] = 'omg'