如何在 ActiveAdmin 中使用 ActiveStorage `has_many_attached` 编辑多个附加图像 [英] How to edit multiple attached images using ActiveStorage `has_many_attached` in ActiveAdmin

问题描述

我有一个简单的模型，可以通过 ActiveStorage 处理文件存储附加多个图像.

I have a simple model that can have multiple images attached via ActiveStorage handling the file storage.

我正在使用 ActiveAdmin 来编辑我的模型并上传/附加图像 - 到目前为止没有问题.

I am using ActiveAdmin to edit my model and to upload/attach the images - so far no problems.

问题是，当我想编辑我的模型并添加新图像时，之前的图像被删除，只添加了新图像.

The problem is, when I want to edit my model, and add new images, then the previous ones are deleted, and only the new ones added.

我可以预览已经附加的图片，也可以单独删除它们，但是我如何实现，通过上传新图片，旧图片不会被删除?

I can do a preview of already attached images, and could also delete them separately, but how do I achieve, that by uploading new images, the old ones are NOT deleted?

我的模型:

class Post < ActiveRecord::Base
  has_many_attached :images
end

我的 ActiveAdmin 页面:

My ActiveAdmin page:

ActiveAdmin.register AdminPost do
  permit_params images:[]

  form do |f|
    f.input :images, as: :file, input_html: { multiple: true }

    if @resource.images.exists?
      @resource.images.map do |m|
        para image_tag m
      end
    end
  end 
end

推荐答案

假设你使用的是 rails 6.0+;您可以通过在您的环境中添加以下代码来解决这个问题(即 development.rb )https://github.com/rails/rails/issues/35817#issuecomment-628654948

assuming u are using rails 6.0+; you can solve this by adding following code in to your environments (i.e - development.rb ) https://github.com/rails/rails/issues/35817#issuecomment-628654948

config.active_storage.replace_on_assign_to_many = false

在您的表单中，

form do |f|
 f.input :images, as: :file, input_html: { multiple: true }
 f.object.images.each do |image|
  span image_tag(image)
 end
end 

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