New hook: afterRemoteError

[bajtos]

Consider the use case described in loopbackio/loopback-datasource-juggler#545

1. in beforeRemote('create', ...) uploaded files (multipart/form-data) are handled
2. this adds the stored filename/path to ctx.args.data so the model will save this
3. however, the model appears to be invalid for some reason (unrelated to the uploaded file)
4. now, validation fails and there's no way to purge the now orphaned uploaded file from storage/disk

We should add a new hook triggered whenever a remote request fails, so that users can clean up any resources allocated in "beforeRemote" hook.

Tasks

• Implement "afterError" hook #190 implementation in strong-remoting
• Model.afterRemoteError hook loopback#1272 implementation in loopback
• Update the documentation

[ritch]

Good idea...

[bajtos]

See #190 for the strong-remoting part. I need to implement Model.afterRemoteError in loopback once #190 is landed.

[bajtos]

I have updated the documentation page http://docs.strongloop.com/display/LB/Remote+hooks and described the new afterRemoteError hook. @crandmck please review the page and edit as you like.

I am closing this issue as resolved.