Rails - Strong parameters with empty arrays

Question

I\'m sending an array of association ids, say foo_ids to my controller. To permit an array of values, I use:

params.permit(foo_ids: [])

Answer 1

I had the same problem recently, but none of the answers here worked for me. This is my solution. If you have javascript handling HTTP requests, this may work for you, too.

In your client side:

if (photo.tags.length === 0){
  photo.tags = ["null"]
}

And on your PhotosController

def photo_params
  p = params.require(:photo).permit(tags: [])
  p["tags"].reject! { |tag| tag == "null" }
  p
end