til/rails/filter-active-storage-blobs-to-only-images.md

Filter ActiveStorage Blobs To Only Images

If your Rails app is using ActiveStorage for both images and ActionMailbox emails, then you're going to have a mix of both in the active_storage_blobs table.

> select id, filename, content_type from active_storage_blobs limit 2;

| id | filename           | content_type   |
|----|--------------------|----------------|
|  1 | shirt-brothers.jpg | image/jpeg     |
|  2 | message.eml        | message/rfc822 |

In that case, you are going to want to make sure that any part of your system that only cares to deal with images filters down to only blobs where the content_type is one that you care about.

I expect that there might be a couple different image content_type values that my system handles, so I filter my active_storage_blobs like so:

@images =
  ActiveStorage::Blob
    .where(content_type: %w[image/jpeg image/png image/gif image/webp])
    .order(created_at: :desc)
    .first(10)