Conditional versions/transforms

[MartinElvar]

Basically i have a generic uploader, which handles uploads of images, videos, and audio files.

I case that the file type is not a image, i don't want to create a thumbnails, as thumbnails of a audio file don't really makes sense.

I currently just reply with :noreply if that is the case, but this will make 3 copys of the same file. Is it somehow possible to disregard transform if a condition is not met?

This is my current code, making 3x videos/audio files.

  # Define a thumbnail transformation:
  def transform(:thumb, {file, _}) do
    if Enum.member?(~w(.jpg .jpeg .gif .png), Path.extname(file.file_name)) do
      {:convert, "-strip -thumbnail 150x150 -gravity center -format png", :png}
    else
      :noaction
    end
  end

  # Define a thumbnail transformation:
  def transform(:thumb_small, {file, _}) do
    if Enum.member?(~w(.jpg .jpeg .gif .png), Path.extname(file.file_name)) do
      {:convert, "-strip -thumbnail 20x20 -gravity center -format png", :png}
    else
      :noaction
    end
  end

[taorg]

It doesn't work because you assume you already have the file, but you don't.
transform function is invoked before the file is in the upload folder
Try this and you would understand:

def transform(:original, _) do
  {:convert, fn(input, output) ->
     IO.inspect input
     IO.inspect output
  "#{input}  #{output}" end, :jpg}
 end

[taorg]

Although it doesn't mean you can't
Try this:
def transform(:original, toLog) do IO.inspect toLog {:convert, fn(input, output) -> "#{input} #{output}" end, :jpg} end