Rails Active Storage

Tips

• A tmp file will be uploaded and recorded in active_storage_blobs table before entering controller business code.(This file can be thought as a backup file. This file will not be deleted if the model record is deleted.)

  For create

• If validation failed before save, the file will still uploaded and recorded in active_storage_blobs table. The metadata value is {"identified":true}, the same as the tmp file.
• If the file is uploaded and record is saved successfully, the metadata value will be marked as {"identified":true,"analyzed":true}.

  For update

• When updating, the old blob file and record in active_storage_blobs table will be deleted.
• A new record will be inserted into active_storage_blobs table and be related to active_storage_attachments.