Fix #5549.

2 files changed, 7 insertions, 3 deletions

diff --git a/activerecord/lib/active_record/attribute_methods.rb b/activerecord/lib/active_record/attribute_methods.rb
index 2a7a77777d..06b66b5195 100644
--- a/activerecord/lib/active_record/attribute_methods.rb
+++ b/activerecord/lib/active_record/attribute_methods.rb
@@ -64,6 +64,7 @@ module ActiveRecord
           return if attribute_methods_generated?
           superclass.define_attribute_methods unless self == base_class
           super(column_names)
+          column_names.each { |name| define_external_attribute_method(name) }
           @attribute_methods_generated = true
         end
       end
diff --git a/activerecord/lib/active_record/attribute_methods/read.rb b/activerecord/lib/active_record/attribute_methods/read.rb
index 1548114580..9b3724777a 100644
--- a/activerecord/lib/active_record/attribute_methods/read.rb
+++ b/activerecord/lib/active_record/attribute_methods/read.rb
@@ -71,22 +71,25 @@ module ActiveRecord
 
             generated_attribute_methods.module_eval <<-STR, __FILE__, __LINE__ + 1
               def __temp__
-                #{internal_attribute_access_code(attr_name, cast_code)}
+                #{internal_attribute_access_code(attr_name, attribute_cast_code(attr_name))}
               end
               alias_method '#{attr_name}', :__temp__
               undef_method :__temp__
             STR
+          end
+
+        private
 
+          def define_external_attribute_method(attr_name)
             generated_external_attribute_methods.module_eval <<-STR, __FILE__, __LINE__ + 1
               def __temp__(v, attributes, attributes_cache, attr_name)
-                #{external_attribute_access_code(attr_name, cast_code)}
+                #{external_attribute_access_code(attr_name, attribute_cast_code(attr_name))}
               end
               alias_method '#{attr_name}', :__temp__
               undef_method :__temp__
             STR
           end
 
-        private
           def cacheable_column?(column)
             attribute_types_cached_by_default.include?(column.type)
           end