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Curl request to upload image from local machine to ruby ​​mode

I have an application built into ruby ​​on rails. I need to send a curl request to this application to download images from a local computer. In my ruby ​​on rails application, I use paperclip for the image downloader.

Now this curl request works fine, since there is no downloadable image for this curl request:

  curl -v -H   "Accept: application/json" -H "Content-type: application/json" -X PUT -d '{"user":{"first_name":"John","last_name":"Smith"},"token":"api"}'  http://localhost:3000/users/8

Now I want to download an image from my local machine.

Adding "display_photo": @ test.jpg does not work: this is what I tried: (But its not working.)

  curl -v -H  -F "Accept: application/json" -H "Content-type: application/json" -X PUT -d '{"user":{"first_name":"firstname","last_name":"lastname","display_photo":@test.jpg},"token":"api"}'  http://localhost:3000/users/8

So the question is how to load images / data files / videos from curl request

EDIT

This is my controller:

   def update
    @user = User.find(params[:id])

    respond_to do |format|
      if @user.update_attributes(params[:user])
        format.html {  redirect_to(@user, :notice => 'User was successfully updated.') }
        format.json  { render :file => "users/json/show.json.erb", :content_type => 'application/json' }
      else
        format.html { render :action => "edit" }
        format.json  { 
          @errors_object = @user
          render :file => "shared/json/errors.json.erb", :content_type => 'application/json' }
      end
    end
  end

In my model:

class User < ActiveRecord::Base
    has_attached_file :display_photo, :styles => { :medium => "200x200#", :thumb => "100x100#", :very_small=>"24x24#" }
end
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:

curl -i -F filedata=@upload.txt http://localhost:5000/

, , -.

, application/octet-stream, . , json-:

Started POST "/" for 127.0.0.1 at 2012-07-10 09:40:59 +0200
Processing by HomeController#index as */*
  Parameters: {"filedata"=>#<ActionDispatch::Http::UploadedFile:0x007f82d59a3580 @original_filename="upload.txt", @content_type="application/octet-stream", @headers="Content-Disposition: form-data; name=\"filedata\"; filename=\"upload.txt\"\r\nContent-Type: application/octet-stream\r\n", @tempfile=#<File:/var/folders/f_/wjnrg7cd3d9f1tpy3k5fhrwm0000gn/T/RackMultipart20120710-30471-1t9abns>>}
+13

, , JSON:

curl -v -H 'Content-Type: multipart/form-data' -H 'Accept: application/json' -H 'x-api-key:myapikey' -F "user[first_name]=firstname" -F "user[last_name]=lastname" -F "user[display_photo]=@test.jpg" http://localhost:3000/users/8
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curl -v -include --form "<param>=@/<root>/image_name.png" http://<your url>
**<param>**: The image parameter of the url;
**<root>**: You can use pwd get image root;
**<your url>**: Post url;
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