Cached Attachment Data

The cached_attachment_data plugin adds the ability to retain the cached file across form redisplays, which means the file doesn't have to be reuploaded in case of validation errors.

plugin :cached_attachment_data

The plugin adds #cached_<attachment>_data to the model, which returns the cached file as JSON, and should be used to set the value of the hidden form field.

photo.cached_image_data #=> '{"id":"38k25.jpg","storage":"cache","metadata":{...}}'

This method delegates to Attacher#cached_data:

attacher.cached_data #=> '{"id":"38k25.jpg","storage":"cache","metadata":{...}}'