Don't modify the columns hash to set defaults from the attributes API

Nothing is directly using the columns for the default values anymore.
This step helps us get closer not not mutating the columns hash.

1 files changed, 5 insertions, 1 deletions

diff --git a/activerecord/lib/active_record/model_schema.rb b/activerecord/lib/active_record/model_schema.rb
index 31ff08a89d..a444aac23c 100644
--- a/activerecord/lib/active_record/model_schema.rb
+++ b/activerecord/lib/active_record/model_schema.rb
@@ -252,7 +252,7 @@ module ActiveRecord
 
       def _default_attributes # :nodoc:
         @default_attributes ||= attributes_builder.build_from_database(
-          columns_hash.transform_values(&:default))
+          raw_default_values)
       end
 
       # Returns an array of column names as strings.
@@ -331,6 +331,10 @@ module ActiveRecord
           base.table_name
         end
       end
+
+      def raw_default_values
+        columns_hash.transform_values(&:default)
+      end
     end
   end
 end