Can't access file/file path in changeset

[pejrich]

What's the point of the cast_attatchements helper? I want to be able to do some stuff with the file in my changeset. Right now, purely by having my schema as field :picture, Pykture.PictureUploader.Type, it causes the changeset the process the upload to S3, and covert my :changes field in my changeset to a %{file_name: "name.jpg", updated_at: XXX}. I would have have params like: %{picture: "/some/path/name.jpg"}. I want to be able to use /some/path/name.jpg BEFORE I decide the upload the process my file, I thought that was what cast_attatchements did, and I could therefore process/upload my file at a later point in my changeset sequence. Is there anyway to do this? Right now there seems to be no difference between having cast_attatchements and not having it. Either way, my changeset will immediately upload/process my file, and convert the file to use the customize map.

[lessless]

I believe this is pretty much not directly related to the arc_ecto. Handling uploads with directly with Plug.Upload will give the desired flexibility to manipulate resources before pushing them to S3.

[andreapavoni]

@pejrich if you want custom paths, you need to work on your uploader file and override storage_dir function. Unfortunately you can't use the model's id because it's not available when you create a new record (except the case you're adding a file after the record is already created).
If you need to apply some algorithm to generate the desired path, then you have to work on the changeset before cast_attachments is called.