关于Rails上的ruby：send_file / send_data不发送文件进行下载

send_file/send_data not sending file for downloading

我正在使用Rails 3.2.22.4和ruby 2.2.4。我正在测试send_file功能。我在服务器日志中收到"文件已发送"，但看不到它正在浏览器中下载。单击"保存"按钮将调用此操作。

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def save_trunk_logs
device_id = params['device_id']
trunk_name = params['trunk_name'] ||="test"
data =""
file ="#{trunk_name}.txt"
trunk_logs = TrunkStatusLog.select([:LogType, :LogMessage, :EpochLoggedAtTime]).where(DeviceID: device_id)
File.open(file,"w+") do |aFile|
aFile.write("Trunk Name : #{trunk_name}\
")
aFile.write("*"*100)
aFile.write("\
")
aFile.write("Time Stamp"+"\\t"+"Log Message\
")
trunk_logs.each do |msg|
data =format_log_messages msg
aFile.write("#{data}\
")
end
end
send_file file, :type => 'text/plain; charset=UTF-8', :disposition => 'attachment'
end

此操作由button_to单击事件调用。

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$("input[value='Download']").on('click', function () {
$.ajax({
type:"POST",
url:"/dm/trunk_test_tools/save_trunk_logs?device_id="+selectedTrunkDeviceId+"&trunk_name="+selectedTrunkDeviceName,
}
})
});

每次我点击下载按钮2个电话。服务器端日志粘贴在下面

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Started POST"/X/Y/save_trunk_logs?device_id=9&trunk_name=SIP_1" for 10.198.2.208 at 2016-10-24 12:58:58 +0530
Processing by ABCController#save_trunk_logs as */*
Parameters: {"device_id"=>"9","trunk_name"=>"SIP_1"}
Sent file SIP_1.txt (0.0ms)
Completed 200 OK in 98.0ms (ActiveRecord: 62.0ms)

Started POST"/X/Y/save_trunk_logs" for 10.198.2.208 at 2016-10-24 12:58:59 +0530
Processing by TrunkTestToolsController#save_trunk_logs as HTML
Parameters: {"authenticity_token"=>"3HSxduOUwccwo="}
sent file test.txt (0.0ms)
Completed 200 OK in 17.0ms (ActiveRecord: 3.0ms)

我不明白为什么拨打第二通电话，以及从何处拨打第二通电话。在第一个服务器调用中，它说已发送文件但未下载。在第二个呼叫文件被发送和下载。但这没有用。参数不正确。我没有将真实性令牌作为参数发送。(跳过了实际数据查询。)

任何帮助将不胜感激。
预先感谢。