Active Storage 清除方法为 NilClass 抛出未定义的方法 signed_id

Active Storage purge method throws undefined method signed_id for NilClass

我遇到的问题与此处的问题类似,但删除数据库对我的项目来说不是一个可行的解决方案:Rails 5.2 ActiveStorage undefined method `signed_id' for nil:NilClass

我有一个表单,允许通过单击 link 上传新图像和删除已上传的图像。该表格在 Rails Active Storage 和 S3 上使用 Ruby。我按照答案 创建了 link 用户可以单击它来删除图像。我认为它正在删除图像。但是,当页面重新加载时,我收到此错误

错误:无法将图像解析为 URL:nil:NilClass

的未定义方法“signed_id”

单击 "Remove" link 后,页面应重新加载并显示剩余图像。我该如何解决这个错误?

这是模型

class Space < ApplicationRecord
  belongs_to :user

  has_many_attached :space_image

end

控制器

class SpacesController < ApplicationController
  before_action :set_space, except: [:index, :new, :create, :delete_image_attachment]
  before_action :authenticate_user!, except: [:show]


  def delete_image_attachment
    @space_image = ActiveStorage::Blob.find_signed(params[:id])
    @space_image.purge_later
    redirect_back(fallback_location: spaces_path)
  end


  private
    def set_space
      @space = Space.find(params[:id])
    end
end

风景

<div>
  <% if @space.space_image.attached? %>
    <% @space.space_image.each do |space_image| %>
    <%= image_tag space_image, class: "avatar-medium" %>
    <%= link_to 'Remove', delete_image_attachment_space_url(space_image.signed_id),
                method: :delete,
                  data: { confirm: 'Are you sure?' } %>
    <% end %>
  <% end %>
</div>

** 服务器错误输出**

ActionView::Template::Error (Can't resolve image into URL: undefined method `signed_id' for nil:NilClass):
    1: <div>
    2:   <% if @space.space_image.attached? %>
    3:     <% @space.space_image.each do |space_image| %>
    4:     <%= image_tag space_image, class: "avatar-medium" %>
    5:     <%= link_to 'Remove', delete_image_attachment_space_url(space_image.signed_id),
    6:                 method: :delete,
    7:                   data: { confirm: 'Are you sure?' } %>

app/views/spaces/_spaceimg.html.erb:4:in `block in _app_views_spaces__spaceimg_html_erb___4211978368865358240_70218939472720'
app/views/spaces/_spaceimg.html.erb:3:in `_app_views_spaces__spaceimg_html_erb___4211978368865358240_70218939472720'
app/views/spaces/listing.html.erb:121:in `block in _app_views_spaces_listing_html_erb__2591928334825339114_70218934956920'
app/views/spaces/listing.html.erb:15:in `_app_views_spaces_listing_html_erb__2591928334825339114_70218934956920'

发生这种情况是因为您直接从ActiveStorage::Blob中删除了一条记录,这样就破坏了一致性。

相反,您必须在 ActiveStorage::Attachment then delete it: see this line 中找到相关记录。


编辑:如何删除附件的一个示例。

已在控制台中测试,因此您可能需要修正一些语法。

space_image.id应该returnActiveStorage::Attachment中记录的id,所以传给controller:

delete_image_attachment_space_url(space_image.id)

然后在controller中,找到记录并应用你需要删除它的方法:

  def delete_image_attachment
    @space_image = ActiveStorage::Attachment.find(params[:id])
    @space_image.purge
    # whatever
  end