| Class | BugAttachmentContentCheck | A mixin class that checks the consistency of patch flag and file type. |
| Class | BugAttachmentSetNavigation | Undocumented |
| Class | BugAttachmentURL | Bug URL creation rules. |
| Class | BugAttachmentEditView | Edit a bug attachment. |
| Class | BugAttachmentPatchConfirmationView | Confirmation of the "patch" flag setting. |
| Class | BugAttachmentFileNavigation | Traversal to +files/${filename}. |