Question

我是RoR的新手。

我已经配置了我的webapp，使用＆＃39; aws-sdk＆＃39;将对象上传到s3。宝石。连接运行正常，对象上传正确。

但是，我很难从Rails中删除这些对象。我收到这个错误：

vcl 4.0;
import std;

#other stuff

sub vcl_synth {
  if (resp.status == 404) {
     set resp.http.Content-Type = "text/html;";
     synthetic(std.fileread("/etc/varnish/404.html"));
     return (deliver);
  }
}

SONGS_CONTROLLER＆gt;

This XML file does not appear to have any style information associated with it. The document tree is shown below.
<Error>
<Code>MethodNotAllowed</Code>
<Message>
The specified method is not allowed against this resource.
</Message>
<Method>POST</Method>
<ResourceType>OBJECT</ResourceType>

INDEX.HTML.RB＆gt;

class SongsController < ApplicationController

  def index
    @songs = Song.all
  end

  def create
    #make an object in your bucket for the upload
    file_to_upload = params[:file]
    file_name = params[:file].original_filename
    bucket = S3.bucket(S3_BUCKET.name)

    obj = bucket.object(file_name)
    #byebug

    #upload the file:
    obj.put(
      acl: "public-read",
      body: file_to_upload
      )

    #create an object for the upload
    @song = Song.new(
      url: obj.public_url,
      name: obj.key
      )

    #save the upload
    if @song.save
      redirect_to songs_path, notice: 'File successfully uploaded'
    else
      flash.now[:notice] = 'There was an error'
      render :new
    end
  end

  def delete
    @song = Song.find(params[:file])
    obj = bucket.object(@song.key)
    obj.delete
    @song.destroy
  end

end

路线＆gt;

  <% @songs.each do |song| %>
  <ul>
    <%= link_to song.name, song.url %>
    ///
    <%= link_to 'Delete', song.url + song.name, method: :delete, data: {confirm: 'Do you want to delete this song?'} %>
  </ul>
  <% end %>

Answer 1

我有一个类似的问题，试图从我的桶中删除图片。据我所知，尝试将ACL更改为public-read-write。如果它只是公开阅读，它将不允许您修改或删除该文件。

当你删除对象时，我遇到了一个问题，保存后我会像你一样将链接保存到我的数据库中。如果要删除对象，只需要密钥。

整个链接如下所示：

//bucketname.region.amazonaws.com/folder/3bd8f451-0d6a-496b-94e9-5d53bde998ab/3.jpg

您无法使用该链接发出删除请求。您必须提取该链接的密钥。

  def delete_s3_image
    key = self.picture.split('amazonaws.com/')[1]
    S3_BUCKET.object(key).delete
  end

键值看起来像这样：

folder/3bd8f451-0d6a-496b-94e9-5d53bde998ab/3.jpg

我把它放在before_destroy回调中。

before_destroy :delete_s3_image

我希望这可以帮助您或其他任何从S3中删除对象时遇到问题的人。

Answer 2

您遇到的问题很可能是使用s3存储桶而非您的代码设置的权限。您需要自行更改该存储桶上的permissions，或者您必须设置一个policy，该用户正在尝试删除该文件。

Answer 3

这是我在S3中删除对象的最终代码

def delete
    #delete song from DB
    @song = Song.find_by(params[:file])
    @song.destroy
    respond_to do |format|
      format.html { redirect_to songs_path, notice: 'File successfully deleted' and return }
      format.json { head :no_content }
    end
    #delete song from bucket
    bucket = S3.bucket(S3_BUCKET.name)
    obj = bucket.object(params[:song])
    obj.delete

  end

从s3 bucket Rails 5 aws-sdk中删除对象

3 个答案: