1 files changed, 12 insertions, 0 deletions
diff --git a/lib/redmine/plugin.rb b/lib/redmine/plugin.rb
index c750c492d..17a20f5a8 100644
--- a/lib/redmine/plugin.rb
+++ b/lib/redmine/plugin.rb
@@ -428,6 +428,18 @@ module Redmine
       Redmine::WikiFormatting.register(name, *args)
     end
 
+    # Register plugin models that use acts_as_attachable.
+    #
+    # Example:
+    #   attachment_object_type SomeAttachableModel
+    #
+    # This is necessary for the core attachments controller routes and attachments/_form to work.
+    def attachment_object_type(*args)
+      args.each do |klass|
+        Redmine::Acts::Attachable::ObjectTypeConstraint.register_object_type(klass.name.underscore.pluralize)
+      end
+    end
+
     # Returns +true+ if the plugin can be configured.
     def configurable?
       settings && settings.is_a?(Hash) && settings[:partial].present?