how to download zip folder in ruby on rails? -

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i have download zip file in tmp folder have downloaded zip file not downloaded zip file. code type=>

=> download folder

def download_folder      @patient_id = params[:patient_id]     @photovideos = photovideo.where('patient_id = ?', user.encrypt(@patient_id))     @time_filename = time.now.strftime("%y%m%d%h%m%s").to_s << ".zip"     tmp_filename = "#{rails.root}/tmp/"+ @time_filename      zip::file.open(tmp_filename, zip::file::create) |z|         @photovideos.each |photovideo|             item = user.decrypt(photovideo[:patient_file])             file = "#{rails.root}/public/patients/#{@patient_id}/"+ item             if file.exists?(file)                 t = file.open(file)                 z.add(item, t)             end             end     end     file.chmod(0777, tmp_filename)            send_file tmp_filename, :type=>"application/zip", :x_sendfile=>true      tmp_filename.delete() #to remove tempfile     render json: { 'response' => 'add files.'}  end 

function download_patient_folder(patient_id){     var $url = 'docsnaphomes/download_folder';     $.post($url, {patient_id: patient_id}, function(data){         window.location = data.response;     }); }

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