【发布时间】：2017-02-07 22:07:50
【问题描述】：
我正在开发一个使用 MongoDB 的项目，但我从未使用过它。 我知道通过使用 javascript，您可以操作数据库。我制作了一个脚本，删除了一些字段并添加了一些其他字段，但它无法正常工作：
db.floor.find({_id:"003"}).forEach( function(doc) { // Find floor with id = 003.
var tiles = doc.tiles; // Get tiles from floor.
for(var i = 0; i < tiles.length; i++){ // Loop through tiles.
var tile = tiles[i]; // Get tile at index i.
if (tile.nodeType){ // If tile has a field "nodeType",
tile.tileType = tile.nodeType; // add a field "tileType"
delete tile.nodeType; // and delete the "nodeType" field.
}
// THIS CODE BELOW IS NOT WORKING
var sensors = tile.sensors; // Get sensors of tile.
for(var j = 0; j < sensors.length; j++){ // Loop through sensors.
var sensor = sensors[j]; // Get sensor at index j.
if (sensor.state){ // If sensor has a field "state",
sensor.activated = sensor.state; // add a field "activated"
delete sensor.state; // and delete the "state" field.
}
}
}
db.floor.save(doc);
});
当db.floor.save(doc) 被调用时，我的楼层被保存了。现在所有图块都有一个名为tileType 的字段，但没有传感器有一个名为activated 的字段！所有传感器仍然有state。我不知道什么不起作用，我对瓷砖和传感器使用相同的代码。请帮忙。
这是地板的结构：
{
"_id" : "003",
"_class" : "nl.kamans.Floor",
"name" : "FloorDemo",
"tiles" : [
{
"_id" : "035",
"sensors" : [
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
}
],
"x" : 0,
"y" : 0,
"batteryVoltage" : 0,
"orientation" : "NORTH",
"nodeType" : "WIRELESS"
},
{
"_id" : "042",
"sensors" : [
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
}
],
"x" : 1,
"y" : 0,
"batteryVoltage" : 0,
"orientation" : "NORTH",
"nodeType" : "WIRELESS"
},
{
"_id" : "049",
"sensors" : [
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
}
],
"x" : 2,
"y" : 0,
"batteryVoltage" : 0,
"orientation" : "NORTH",
"nodeType" : "WIRELESS"
},
{
"_id" : "007",
"sensors" : [
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
}
],
"x" : 3,
"y" : 0,
"batteryVoltage" : 0,
"orientation" : "NORTH",
"nodeType" : "WIRELESS"
},
{
"_id" : "029",
"sensors" : [
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
}
],
"x" : 0,
"y" : 1,
"batteryVoltage" : 0,
"orientation" : "NORTH",
"nodeType" : "WIRELESS"
},
{
"_id" : "021",
"sensors" : [
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
}
],
"x" : 1,
"y" : 1,
"batteryVoltage" : 0,
"orientation" : "NORTH",
"nodeType" : "WIRELESS"
},
{
"_id" : "014",
"sensors" : [
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
},
{
"state" : false,
"ignored" : false
}
],
"x" : 2,
"y" : 1,
"batteryVoltage" : 0,
"orientation" : "NORTH",
"nodeType" : "WIRELESS"
}
],
"height" : 1,
"width" : 3,
"defined" : true,
"lastUpdate" : ISODate("2016-09-29T13:26:40.866Z")
}
【问题讨论】：
-
你的代码不工作怎么办？您是否在控制台中收到错误消息？
-
@thanksd 没有错误，只是没有保存传感器的新字段
-
@J.Kamans 根据您的样本数据。没有具有真值的状态，这就是为什么您的 if 部分不更新新字段的原因。
-
@sumitchoudhary：cmets 部分适用于 cmets。如果您有问题的答案，请将其作为答案发布。当然不要要求那些发布答案的人将他们的答案转换为 cmets（？！）。谢谢。
标签： javascript mongodb mongodb-query