Universal function put_upload_change to support all field names

[bulatshafigullin]

Hi,
I'm writing universal function to make upload config,
so basically in my LiveResource I want to do something like this
@impl Backpex.LiveResource def fields do [image: Uploads.make_upload(%{label: "Pic", upload_key: :my_pic_field})]

so I wrote module Uploads, which has put_upload_change func.
And in that function I need to know param name to put one in the map params
`case files do
[file] ->
Map.put(params, "image", media_subdir() |> Path.join(file))

  [_file | _other_files] ->
    Map.put(params, "image", "too_many_files")

  [] ->
    Map.put(params, "image", "")
end`

What's the best way to get that param name?

[bulatshafigullin]

Also would be great to be able to get other config params like max_entries
I'm considering writing macro at the moment, can't find other way around.

[bulatshafigullin]

But most convenient would be if I had all field_options in fn args

[bulatshafigullin]

Finally fellow developer advised to use inline fn
So this works well

def make_upload(opts \\ %{label: "Картинка", upload_key: :image}) do
    upload_key = Map.get(opts, :upload_key)
    %{
      module: Backpex.Fields.Upload,
      label: Map.get(opts, :label),
      upload_key: upload_key,
      accept: ~w(.jpg .jpeg .png),
      max_entries: 1,
      max_file_size: 5_000_000,
      put_upload_change: fn _socket, params, item, uploaded_entries, removed_entries, action ->
        put_upload_change(_socket, params, item, uploaded_entries, removed_entries, action, upload_key)
      end,
      consume_upload: &consume_upload/4,
      remove_uploads: &remove_uploads/3,
      list_existing_files: fn item -> list_existing_files(item, upload_key) end,
      render: fn
        %{value: value} = assigns when value == "" or is_nil(value) ->
          ~H"<p><%= Backpex.HTML.pretty_value(@value) %></p>"

        assigns ->
          ~H'<img class="h-10 w-auto" src={file_url(@value)} />'
      end,
      except: [:index, :resource_action],
      align: :center
    }
  end