I'm working on a project that uses MongoDB, but I've never worked with it. I understand that by using javascript, you can manipulate the database. I made a script that removes some fields and adds some others, but it doesn't work properly:
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);
});
When db.floor.save(doc)
is called, my floor is saved. All tiles now have a field called tileType
, but no sensor has a field called activated
! All sensors still have state
. I do not know what is not working, I'm using the same code for the tile and for the sensor. Please help.
{
"_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")
}
Per comment of @sumitchoudhary:
When checking with if(sensor.state)
, it checks if the value of sensor.state
is truthy. All my sensor states are false. So I never get in the if-statement... It is different for if(tile.nodeType)
, because that has a String in it and is always truthy (for my values).
if ("state" in sensor)
{
// If sensor has a field "state",
sensor.activated = sensor.state; // add a field "activated"
delete sensor.state; // and delete the "state" field.
}
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