Add a method full_messages_for to the Errors class

1 files changed, 14 insertions, 0 deletions

diff --git a/activemodel/lib/active_model/errors.rb b/activemodel/lib/active_model/errors.rb
index 963e52bff3..485eb1a40a 100644
--- a/activemodel/lib/active_model/errors.rb
+++ b/activemodel/lib/active_model/errors.rb
@@ -352,6 +352,20 @@ module ActiveModel
       map { |attribute, message| full_message(attribute, message) }
     end
 
+    # Returns all the full error messages for a given attribute in an array.
+    #
+    #   class Person
+    #     validates_presence_of :name, :email
+    #     validates_length_of :name, in: 5..30
+    #   end
+    #
+    #   person = Person.create()
+    #   person.errors.full_messages_for(:name)
+    #   # => ["Name is too short (minimum is 5 characters)", "Name can't be blank"]
+    def full_messages_for(attribute)
+      (get(attribute) || []).map { |message| full_message(attribute, message) }
+    end
+
     # Returns a full message for a given attribute.
     #
     #   person.errors.full_message(:name, 'is invalid') # => "Name is invalid"