Add more data to AR::UnknownAttributeError

begin
  Topic.new("hello" => "world")
rescue ActiveRecord::UnknownAttributeError => e
  e.record # => #<Topic ... >
  e.attribute # => "hello"
end

1 files changed, 9 insertions, 0 deletions

diff --git a/activerecord/lib/active_record/errors.rb b/activerecord/lib/active_record/errors.rb
index cd31147414..017b8bace6 100644
--- a/activerecord/lib/active_record/errors.rb
+++ b/activerecord/lib/active_record/errors.rb
@@ -159,6 +159,15 @@ module ActiveRecord
 
   # Raised when unknown attributes are supplied via mass assignment.
   class UnknownAttributeError < NoMethodError
+
+    attr_reader :record, :attribute
+
+    def initialize(record, attribute)
+      @record = record
+      @attribute = attribute.to_s
+      super("unknown attribute: #{attribute}")
+    end
+
   end
 
   # Raised when an error occurred while doing a mass assignment to an attribute through the