after_assign's copy_to doesn't fire when using retained_image

[rdunlop]

My model has 2 attachments

• original_uid
• image_uid

    dragonfly_accessor :original do
      copy_to :image
    end
    dragonfly_accessor :image do
      after_assign :process_image
    end

I am also using retained_original in my form.

The problem seems to be that:

• If I upload a graphic, and submit the form
• And the form Fails validation (thus filling the retained_original)
• And then I fix the form issue
• When I submit the form, the original_uid is set but the image_uid is NOT set.

Based on reading the source code it looks like the "retained_#{attribute}=" method does not go through the dragonfly_attachments[attribute].assign(value) path, which prevents the after_assign callback from being fired.

My only idea right now is to remove the retained_original usage, since this is causing my models to end up in an unexpected situation.

Please let me know if I'm using these 2 features together incorrectly.

[rdunlop]

This appears to be the same as #348 (comment)