lib/active_model/dirty.rb in activemodel-8.0.0.beta1 vs lib/active_model/dirty.rb in activemodel-8.0.0.rc1

@@ -245,15 +245,21 @@
       attribute_method_affix prefix: "clear_", suffix: "_change", parameters: false
     end
 
     def initialize_dup(other) # :nodoc:
       super
-      if self.class.respond_to?(:_default_attributes)
-        @attributes = self.class._default_attributes.map do |attr|
-          attr.with_value_from_user(@attributes.fetch_value(attr.name))
+      @mutations_from_database = nil
+    end
+
+    def init_attributes(other) # :nodoc:
+      attrs = super
+      if other.persisted? && self.class.respond_to?(:_default_attributes)
+        self.class._default_attributes.map do |attr|
+          attr.with_value_from_user(attrs.fetch_value(attr.name))
         end
+      else
+        attrs
       end
-      @mutations_from_database = nil
     end
 
     def as_json(options = {}) # :nodoc:
       except = [*options[:except], "mutations_from_database", "mutations_before_last_save"]
       options = options.merge except: except