1 files changed, 20 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/attribute_methods/primary_key.rb b/activerecord/lib/active_record/attribute_methods/primary_key.rb
index a5c2849844..16362acfe9 100644
--- a/activerecord/lib/active_record/attribute_methods/primary_key.rb
+++ b/activerecord/lib/active_record/attribute_methods/primary_key.rb
@@ -9,7 +9,27 @@ module ActiveRecord
         [key] if key
       end
 
+      # Returns the primary key value
+      def id
+        read_attribute(self.class.primary_key)
+      end
+      alias _id id
+
+      # Sets the primary key value
+      def id=(value)
+        write_attribute(self.class.primary_key, value)
+      end
+
+      # Queries the primary key value
+      def id?
+        query_attribute(self.class.primary_key)
+      end
+
       module ClassMethods
+        def dangerous_attribute_method?(method_name)
+          super && !['id', 'id=', 'id?', '_id'].include?(method_name)
+        end
+
         # Defines the primary key field -- can be overridden in subclasses. Overwriting will negate any effect of the
         # primary_key_prefix_type setting, though.
         def primary_key