Check whether image exists or not in dropbox

[smmanoj]

I am using the following method to check whether the image exists or not in dropbox, But it shows "true" even if the image is not present.

My uploader:

class Avatar < CarrierWave::Uploader::Base
    include CarrierWave::MiniMagick
    storage: dropbox
    def store_dir
        if model
          "uploads/#{model.class.to_s.underscore}/#{model.id}/#{mounted_as}"
        else
          "uploads/#{mounted_as}/"
        end
     end 
 end

Console output:

>Article.first.avatar?
>true
    #<AvatarUploader:0x007f8574143ee8
@file=
 #<CarrierWave::Storage::Dropbox::File:0x007f8574143308
  @client=
  #<DropboxClient:0x007f8574143420
   @root="dropbox",
   @session=
    #<DropboxSession:0x007f8574143498
    @access_token=#<OAuthToken:0x007f8574143470 @key="123453333",      @secret="22222222222">,
   @consumer_key="abcdeafs",
   @consumer_secret="asdfasfj",
   @locale=nil,
   @request_token=nil>>,
   @config=
{:app_key=>"asdfasfasf",
 :app_secret=>"asdfkasfksf",
 :access_token=>"adfkjasfkhs",
 :access_token_secret=>"aksdfkhsfksf",
 :access_type=>"dropbox",
 :user_id=>"292929292"},
 @path="uploads/images/370/avatar.png",
 @uploader=#<AvatarUploader:0x007f8574143ee8 ...>>,
 @model=
  #Artcle Model>,
  @mounted_as=:image,
  @storage=
  #<CarrierWave::Storage::Dropbox:0x007f8574143c90
   @config=
    {:app_key=>"asdfasfasf",
    :app_secret=>"asdfkasfksf",
    :access_token=>"adfkjasfkhs",
    :access_token_secret=>"aksdfkhsfksf",
    :access_type=>"dropbox",
    :user_id=>"292929292"},
   @dropbox_client=
  #<DropboxClient:0x007f8574143420
   @root="dropbox",
   @session=

I should get "false" when the image is not present in dropbox. Kindly help me to solve this.