Question

我使用Node-RED为MongoDB创建了一个小型REST-API。

这很好用：<node-red-url>:<node-red-port>/rest/demo向我显示所有条目。

我甚至可以过滤结果：追加?userName=demo仅显示{userName: "demo"}的条目。

在我的数据库中，我有一些数字值。像{weight: 10}这样的东西。请注意，这不是{weight: "10"}！

现在我只想要{weight: 10}的条目。但是当我追加?weight=10时，转移的参数会将10转换为"10"。其中没有命中，因为我的所有weight - 值都是数字而不是字符串。

我可以以某种方式更改附录以按weight过滤吗？或者我是否必须优化我的REST逻辑？

//编辑：这就是我的流程：

[{"id":"c4a27b53.59303","type":"mongodb in","z":"99225255.0516b8","mongodb":"7e071505.7198bc","name":"","collection":"demo","operation":"find","x":660,"y":580,"wires":[["852d2853.264698"]]},{"id":"af5a916a.08366","type":"function","z":"99225255.0516b8","name":"parseQuery","func":"msg.payload = (msg.req.query);\n\nmsg.limit = 100;\nmsg.skip = 0;\n\nreturn msg;","outputs":1,"noerr":0,"x":330,"y":580,"wires":[["c4a27b53.59303"]]},{"id":"6b0b1b4b.eb8b2c","type":"http in","z":"99225255.0516b8","name":"","url":"/rest/demo","method":"get","swaggerDoc":"","x":120,"y":580,"wires":[["af5a916a.08366"]]},{"id":"852d2853.264698","type":"http response","z":"99225255.0516b8","name":"","x":950,"y":580,"wires":[]},{"id":"7e071505.7198bc","type":"mongodb","z":"","hostname":"192.168.100.166","port":"27017","db":"training","name":"debianTraining"}]

// EDIT2：的更新

我用更多服务器逻辑修复了这个问题：

if (msg.payload.hasOwnProperty('weight')) {
   msg.payload.weight = parseInt(msg.payload.weight);
}

我添加了两个案例来搜索＆＃34;大于＆＃34;和＆＃34;小于＆＃34;：

if (msg.payload.hasOwnProperty('weightG')) {
   msg.payload = {"weight": {$gt: parseInt(msg.payload.weightG)}};
   delete msg.payload['weightG'];
}
if (msg.payload.hasOwnProperty('weightL')) {
   msg.payload = {"weight": {$lt: parseInt(msg.payload.weightL)}};
   delete msg.payload['weightL'];
}

到目前为止一切正常。

Answer 1

好的，看过将HTTP查询转换为Mongo查询的函数节点，我认为没有一种很好的方法可以动态地为Mongo中的任意对象执行此操作。

所有HTTP查询参数都将成为字符串，因此如果您知道文档中的某个特定字段是一个数字，那么您只能转换该字段。 e.g。

msg.payload = (msg.req.query);

if (msg.payload.hasOwnProperty('weight')) {
   msg.payload.weight = parseInt(msg.payload.weight)
}

msg.limit = 100;
msg.skip = 0;

return msg;

如何使用Node-RED REST-API按数字过滤

1 个答案: