1 files changed, 1 insertions, 9 deletions
diff --git a/activerecord/lib/active_record/base.rb b/activerecord/lib/active_record/base.rb
index 907495a416..bca2db70f8 100755
--- a/activerecord/lib/active_record/base.rb
+++ b/activerecord/lib/active_record/base.rb
@@ -122,10 +122,6 @@ module ActiveRecord #:nodoc:
   class MissingAttributeError < NoMethodError
   end
 
-  # Raised when unknown attributes are supplied via mass assignment.
-  class UnknownAttributeError < NoMethodError
-  end
-
   # Raised when an error occurred while doing a mass assignment to an attribute through the
   # <tt>attributes=</tt> method. The exception has an +attribute+ property that is the name of the
   # offending attribute.
@@ -2441,11 +2437,7 @@ module ActiveRecord #:nodoc:
         attributes = remove_attributes_protected_from_mass_assignment(attributes) if guard_protected_attributes
 
         attributes.each do |k, v|
-          if k.include?("(")
-            multi_parameter_attributes << [ k, v ]
-          else
-            respond_to?(:"#{k}=") ? send(:"#{k}=", v) : raise(UnknownAttributeError, "unknown attribute: #{k}")
-          end
+          k.include?("(") ? multi_parameter_attributes << [ k, v ] : send(k + "=", v)
         end
 
         assign_multiparameter_attributes(multi_parameter_attributes)