Need help updating an element inside params

Phoenix Forum Questions / Help
1

I have this:

%{
  "file" => %Plug.Upload{
    content_type: "application/msword",
    filename: "luggar-cat6-sftp-bc-23awg-nyy-305m.doc",
    path: "/tmp/plug-1643/multipart-1643576402-233496152491789-3"
  },
  "record_id" => "12"
}

I want to change the file name to something else, how do that, tried by Map.update but failed. Thank you.

2

Path is the real filename, filename is just an indication.

As it is a plug upload, it should be temporary. You need to consume it.

I usually do this with File.rename!(path, dest) with whatever name I want for dest. But I don’t try to update the Plug.Upload map.

3

I need to do so because the built in method in waffle for file renaming is not working with waffle_ecto (changes file name on storage but not in DB). So, I think changing it here would solve the issue. Updating nested maps confuses me. I have tried, but the resulting object is not accepted as a changeset.

4

You should show your uploader code…

I do rename my files without problem.

For example, I use Slugger to rename filename (with Waffle and Waffle Ecto).

  def filename(_version, {file, scope}) do
    filename = file.file_name
      |> Path.basename(Path.extname(file.file_name))
      |> slugify()

    "#{scope.permalink}_#{filename}"
  end

  # Slugify filename
  defp slugify(filename) do
    Slugger.slugify(filename)
  end
1 Like
5

Do you think the scope.permalink thing is esssential? I have tried without that part…

6

This is a sample of my config, where I use a permalink field to identify my resources.

I use for filename a combination of a custom field, and slug of the original name.

It won’t work unless You define your resources like I do :slight_smile:

7

This thing is not working on latest versions of waffle and waffle_ecto. File saved to disk as specified by the function but in DB, original filename is used. Something wrong there.