Question

我在我的资源上使用回形针删除方法在ruby on rails网站上并尝试删除附件，我遇到的问题是即使我没有选中复选框来删除图像它仍然删除它对我来说这是错误。这就是我所拥有的：

idea.rb模型

class Idea < ActiveRecord::Base

    include PgSearch
    pg_search_scope :search, :against => [:title, :slug, :idea_type, :body],
    using: { tsearch:{ dictionary: "english" } }

    def self.text_search(query)
      if query.present?
        where("title @@ :q or body @@ :q or idea_type @@ :q", q: query)
      else
        scoped
      end
    end

    paginates_per 6

    has_attached_file :featured_image, :styles => { :medium => "300x300>", :thumb => "100x100>", :crop_cover => "390x240>" }, :default_url => "/images/:style/missing.png"
    validates_attachment_content_type :featured_image, :content_type => /\Aimage\/.*\Z/

    validates :idea_type, :title, :slug, :body, presence: true

    before_save :destroy_image?

    extend FriendlyId
    friendly_id :title, use: [:slugged, :finders]

    def should_generate_new_friendly_id?
        title_changed?
    end

    def img_delete
       @featured_image_delete ||= "0"
    end

    def img_delete=(value)
       @featured_image_delete = value
    end

private

    def destroy_image?
        self.featured_image.clear if @featured_image_delete == "1" and !featured_image.dirty?
    end

end

然后在我的控制器更新中我有这个：

    def update
        @idea.featured_image.clear
        respond_to do |format|
          if @idea.update(idea_params)
            format.html { redirect_to @idea, notice: 'Idea was successfully updated.' }
            format.json { head :no_content }
          else
            format.html { render action: 'edit' }
            format.json { render json: @idea.errors, status: :unprocessable_entity }
          end
        end
      end

def idea_params
      params.require(:idea).permit(:title, :featured_image, :img_delete, :video, :author_id, :body, :idea_type, :provided_by_logo, author_attributes: [:name,:biography])
    end

然后在我删除复选框的表单中，我有：

<div class="field">
   <h3>Delete image(save idea to delete featured image)</h3>
   <%= f.check_box :img_delete, :label => 'Delete Image' %>
</div>

任何人都可以告诉我为什么它会删除图像，即使我没有勾选复选框。这是在控制台中为任何人感兴趣的输出：

Parameters: {"utf8"=>"✓", "authenticity_token"=>"Y4dEALXAMAEexn+ztgI5mkZ/aIUsysRRCAlYUVgjhD4=", "idea"=>{"user_id"=>"50", "title"=>"A test", "img_delete"=>"0", "video"=>"<iframe width=\"960\" height=\"515\" src=\"https://www.youtube.com/embed/JlP4ZppEcJ8\" frameborder=\"0\" allowfullscreen></iframe>", "body"=>"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed posuere consectetur est at lobortis. Sed posuere consectetur est at lobortis. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus.<br />\r\n<br />\r\n<img alt=\"\" src=\"/ckeditor_assets/pictures/4/content_croc-cover.jpg\" style=\"height:506px; width:600px\" />", "idea_type"=>"make"}, "commit"=>"Update Idea", "id"=>"a-test"}

请注意， "img_delete"=>"0" 为零，即使我使用检查器查看复选框的值等于1，如下所示：

<input id="idea_img_delete" label="Delete Image" name="idea[img_delete]" type="checkbox" value="1">

Answer 1

现在，无论如何，您都要清除#update上的图像。试试这个：

在models/idea.rb

class Idea < ActiveRecord::Base
   attr_accessor :featured_image_delete
   before_save(on: :update) do 
      self.featured_image.clear if self.featured_image_delete == "1" and !self.featured_image.dirty?
   end
end

在控制器（#update）中删除@idea.featured_image.clear，因为这实际上是导致图像被删除的原因。

为什么rails回形针在更新时删除附件而不单击复选框？

1 个答案: