MongoDB添加和刪除數組中的字段

我正在使用MongoDB的項目，但我從來沒有使用它。我明白，通過使用JavaScript，你可以操縱數據庫。我做了一個腳本，刪除某些領域，並增加了一些人，但它不能正常工作：MongoDB添加和刪除數組中的字段

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); 
});

當db.floor.save(doc)被調用時，我的地板被保存。所有瓷磚現在都有一個名爲tileType的字段，但沒有傳感器具有名爲activated的字段！所有傳感器仍然有state。我不知道什麼是不工作，我使用相同的代碼爲瓷磚和傳感器。請幫忙。

這是地板的結構：

{ 
"_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")

}

來源

2016-09-29 J. Kamans

什麼？你在控制檯中遇到錯誤嗎？ – thanksd

@thanksd沒有錯誤，它只是不保存傳感器的新領域 –

我認爲答案在這裏http://stackoverflow.com/questions/7714216/add-new-field-to-a-collection-in- mongodb – thanksd

每@sumitchoudhary的評論：

當if(sensor.state)檢查，其檢查的sensor.state值truthy。我所有的傳感器狀態都是假的。所以我從來沒有進入if語句......它與if(tile.nodeType)不同，因爲它有一個字符串，並且總是真的（對於我的值）。

正確檢查必須是：

你的心不是代碼工作

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. 
}

來源

2016-09-29 14:45:51

MongoDB添加和刪除數組中的字段

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