1 files changed, 2 insertions, 6 deletions
diff --git a/activerecord/lib/active_record/core.rb b/activerecord/lib/active_record/core.rb
index 224112b559..b11c4f804f 100644
--- a/activerecord/lib/active_record/core.rb
+++ b/activerecord/lib/active_record/core.rb
@@ -315,9 +315,8 @@ module ActiveRecord
 
     ##
     def initialize_dup(other) # :nodoc:
-      pk = self.class.primary_key
       @attributes = @attributes.dup
-      @attributes.write_from_database(pk, nil)
+      @attributes.reset(self.class.primary_key)
 
       run_callbacks(:initialize) unless _initialize_callbacks.empty?
 
@@ -515,10 +514,7 @@ module ActiveRecord
     end
 
     def init_internals
-      pk = self.class.primary_key
-      if pk && !@attributes.include?(pk)
-        @attributes.write_from_database(pk, nil)
-      end
+      @attributes.ensure_initialized(self.class.primary_key)
 
       @aggregation_cache        = {}
       @association_cache        = {}