There are some ways to do it.

Oban by @sorentwo.

or a simple task… like in this post by @alvises

BTW, You may find more articles on using mogrify, or doing raw file upload in the previous linked site.

After this, You can create your own helper to display the associated files. For example it could be

render_slice(img)

Hello and welcome,

It is possible to specify multiple versions in the uploader, something like…

  @versions [:original, :large, :thumb, :mini]

  def transform(:mini, _) do
    {:convert, "-resize 160x90^ -gravity center -extent 160x90 -format png", :png}
  end

  def transform(:thumb, _) do
    ...
  end

  def transform(:large, _) do
    ...
  end

For delete, I did not solve it yet in the best way… In case of cascade delete for example…

But I have a cleaning task running periodically, deleting what needs to be.

I think you’re talking about images files associated with database records, right? Indeed I can’t see really a better solution.

But just in case the OP author is not aware of it, I would like to add this:

A Waffle uploader module has a delete function that should delete all the versions of an image (:mini, :large, :original…) all together when called.