【发布时间】：2017-03-26 20:06:02
【问题描述】：
我正在尝试建立一个简单的物联网温度监控系统。 Node Red 似乎是一个不错的解决方案。
我已经在 ubuntu 16.04 上安装了 node red 和 mongodb。当我尝试将数据存储到 mongodb 中时，它会成功存储，但是，当我尝试从数据库中获取数据时，我的调试选项卡上出现以下错误：MongoError: limit requires an integer
这是我的节点：
[{"id":"845a2d0f.f529f","type":"debug","z":"175fe64a.2e87ba","name":"","active":true,"console":"false","complete":"false","x":698,"y":118,"wires":[]},{"id":"37b967b4.5953a8","type":"http in","z":"175fe64a.2e87ba","name":"/iot request","url":"/iot","method":"get","swaggerDoc":"","x":229.9517059326172,"y":314.0511169433594,"wires":[["70d77b6c.c2f234"]]},{"id":"70d77b6c.c2f234","type":"mongodb in","z":"175fe64a.2e87ba","mongodb":"5b5bee5b.f2593","name":"retrieve hello","collection":"test","operation":"find","x":472.9545593261719,"y":356.5880432128906,"wires":[["3b3c5324.f2f78c"]]},{"id":"3b3c5324.f2f78c","type":"http response","z":"175fe64a.2e87ba","name":"show hello","x":760.960205078125,"y":311.91192626953125,"wires":[]},{"id":"ac92efad.22272","type":"mqtt in","z":"175fe64a.2e87ba","name":"get outtemp","topic":"/sensors/esp0/temp0","qos":"2","broker":"fd4c9ee3.0aa1a","x":193,"y":118,"wires":[["845a2d0f.f529f","63a9e917.39f568"]]},{"id":"63a9e917.39f568","type":"mongodb out","z":"175fe64a.2e87ba","mongodb":"5b5bee5b.f2593","name":"store temp","collection":"test","payonly":true,"upsert":false,"multi":false,"operation":"store","x":406,"y":219,"wires":[]},{"id":"5b5bee5b.f2593","type":"mongodb","z":"","hostname":"127.0.0.1","port":"27017","db":"testdb","name":""},{"id":"fd4c9ee3.0aa1a","type":"mqtt-broker","z":"","broker":"localhost","port":"1883","clientid":"","usetls":false,"compatmode":true,"keepalive":"200","cleansession":true,"willTopic":"","willQos":"0","willPayload":"","birthTopic":"","birthQos":"0","birthPayload":""}]
我是一个完整的初学者，同时使用 node red 和 mongodb，对 mqtt 有一些经验。
我该如何解决这个问题？
【问题讨论】：
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我认为这个问题已在最新版本的 mongo node-red 节点中得到解决。与其尝试在 cmets 中调试它，不如在 node-red 邮件列表上发帖（nodered.org 底部的链接）
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@knolleary 感谢您的提示，该邮件列表上还有另一个人有同样的问题（我的谷歌搜索中没有出现）；问题解决了