Move conditionals about freezing closer to the definition of `freeze`

Reduces the number of places that care about the internals of how we
store and type cast attributes. We do not need to go through the
dup/freeze dance, as you couldn't have saved a frozen new record anyway,
and that is the only time we would end up modifying the frozen hash.

1 files changed, 6 insertions, 0 deletions

diff --git a/activerecord/lib/active_record/core.rb b/activerecord/lib/active_record/core.rb
index c996e93076..79388f53b5 100644
--- a/activerecord/lib/active_record/core.rb
+++ b/activerecord/lib/active_record/core.rb
@@ -546,5 +546,11 @@ module ActiveRecord
     def init_attributes(attributes, options)
       assign_attributes(attributes)
     end
+
+    def thaw
+      if frozen?
+        @raw_attributes = @raw_attributes.dup
+      end
+    end
   end
 end