Perform the replacement in a before_create callback so that it runs in a
transaction and if it fails, the transaction will rollback and the
replacement record won't be created.
Doing the replacement in a transaction isn't great because, for one
thing, it could hold the transaction open a long time, which isn't good
for the database. And two, if the transaction rolls back, the database
changes will be undone, but if the replacement file has already been saved
to disk, then it won't be undone, which could result in a dangling file.
Don't default the "Final source" field to the current source. This way
the default will be to set the source to the normalized replacement URL.
The "final source" field can be set to override this.
Also remove options to configure names of wiki notice pages. These names
generally don't need to be changed and we already hardcode links to wiki
pages in other places anyway.
* Adds a "Tags" field to the post replacement dialog box. The given tags
are added to the post after replacement.
* Prefills the Tags field with certain tags that usually need to be
removed after replacement: replaceme, image_sample, jpeg_artifacts, etc.
Adds a "Final Source" field to the post replacement dialog. If
specified, the post's source field will be changed to this value after
replacement.
This makes fixing the source back to the HTML page after
replacement easier.
