def update_img
    if params[:file].present? and params[:id].present?
      picture = Picture.find(params[:id])
      picture.update(file: params[:file])

      render json: {message: "success",
        picture_path: picture.file(:square).gsub("s3.", "s3.eu-central-1.")
      }
    else
      redirect_to request.referrer, notice: "You're being redirected"
    end
  end