arrays - Rails 5 CarrierWave，无法删除多重上传中的最后一个文件

Question

按照此操作方法:

https://github.com/carrierwaveuploader/carrierwave/wiki/How-to:-Add-more-files-and-remove-single-file-when-using-default-multiple-file-uploads-feature

class ImagesController < ApplicationController
  before_action :set_gallery

  def create
    add_more_images(images_params[:images])
    flash[:error] = "Failed uploading images" unless @gallery.save
    redirect_to :back
  end

  def destroy
    remove_image_at_index(params[:id].to_i)
    flash[:error] = "Failed deleting image" unless @gallery.save
    redirect_to :back
  end

  private

  def set_gallery
    @gallery = Gallery.find(params[:gallery_id])
  end

  def add_more_images(new_images)
    images = @gallery.images 
    images += new_images
    @gallery.images = images
  end

  def remove_image_at_index(index)
    remain_images = @gallery.images # copy the array
    deleted_image = remain_images.delete_at(index) # delete the target image
    deleted_image.try(:remove!) # delete image from S3
    @gallery.images = remain_images # re-assign back
  end

  def images_params
    params.require(:gallery).permit({images: []}) # allow nested params as array
  end
end

我似乎无法正确删除最后一个文件。在我的打印文件列表中，它一直站在那里。奇怪的是 0kb。

然后，当我加载新文件时，这个文件就会消失。

Answer 1

我遇到了同样的问题，我发现你必须调用“remove_images!”如果这是最后一次的话。在“remove_image_at_index”函数中添加:

@gallery.remove_images! if remain_images.empty?

问候