How to crop an image with rails 4

Yes I tried that and it seems to work. I can see the image select an area, and view a preview. The problem is I click save nothing happens. I'm almost positive it is the way I have my controller written, I'll post below what I have.

  def update
    respond_to do |format|
      if @profile_picture.update(profile_picture_params)
        format.html { render :action => "crop"}
        format.html { redirect_to edit_user_path(@current_user), notice: 'Profile picture was successfully updated.' }
        format.json { render :show, status: :ok, location: @profile_picture }
      else
        format.html { render :edit }
        format.json { render json: @profile_picture.errors, status: :unprocessable_entity }
      end
    end
  end

any Ideas on how to properly write the controller. The "crop" file is exactly as shown on the papercrop docs.

Thanks, Dave

Unfortunately I did not manage to implement this myself properly. It shows up, but doesn't save the newly cropped file. And the documentation is very scarce.

Exactly my problem. Do you know how to make it work, or is there a better way to add this feature. Or is this a feature I should just forget about?

I don't have any solution for you at this moment. I may find it in the future and I will post it here if I do.