Question

我正在使用nodejs（expres framwork）和使用mongoose的mongodb。我正在尝试将地理位置坐标保存到我的数据库中。

这就是我的架构的样子：

//defining a schema
var TopicSchema = mongoose.Schema({
   topicTitle: String,
   topicDescription: String,
   topicDateCreated: { 
      type: Date, 
      default: Date.now 
   },
   fbId: String,
   twId: String,
   location: {
      type: {
        type : String
      },
   coordinates: [Number]
  }
});

TopicSchema.index({ location: '2dsphere' });
var Topic = restful.model('topic', TopicSchema);
Topic.methods(['get', 'put', 'post', 'delete']);
Topic.register(app, '/data');

通过socket.io我将数据传递给服务器。服务器接收数据但保存后我收到以下错误：

MongoError: Can't extract geo keys

Answer 1

错误在于：

let dictionary = NSDictionary(objects: [user.username, image!], forKeys: ["username", "image"])

这里发生的是你将两个数字组合成一个字符串，var coordinates = LON + ", " + LAT;成为一个字符串。您将架构定义为具有coordinates的位置点数组。将[Number]作为字符串发送将违反您的架构定义。

要解决您的错误，请创建一个地理点数组，例如coordinates

Answer 2

Mongodb使用经度 - 纬度系统来存储地理位置索引。此坐标是浮点值，但您可以将它们设置为要使用的数字。请尝试以下方案：

var TopicSchema = mongoose.Schema({
   topicTitle: String,
   topicDescription: String,
   topicDateCreated: { 
      type: Date, 
      default: Date.now 
   },
   fbId: String,
   twId: String,
   location: {
      type: {
        type : String
      },
   coordinates: [ ]
  }
});

您可以在此repo或此answer

中看到其他示例

Answer 3

$("#btnPostTopic").on("click", function(e)
            {
                //get the value of the inputfields and textarea
                var title = $('#TopicTitle').val();
                var description = $('#TopicDescription').val();
                var LON = parseFloat($('#longitude').val());
                var LAT = parseFloat($('#latitude').val());

                var coordinates =  LON + ", " + LAT; 
                console.log("COORDINATES are " + coordinates); 

                var resultLocalStorageFB = document.getElementById("resultFB");
                var resultLocalStorageTW = document.getElementById("resultTW");
                resultLocalStorageFB.value = localStorage.getItem("useridfb");
                resultLocalStorageTW.value = localStorage.getItem("useridtw");
                console.log(resultLocalStorageFB);
                console.log(resultLocalStorageTW);

                var FbId = $('#resultFB').val();
                var TWId = $('#resultTW').val();
                console.log('Fb Id: ' + FbId);
                console.log('TW Id: ' + TWId);

                var Point = "Point";

                result = { 
                    "topicTitle": title, 
                    "topicDescription": description, 
                    "fbId": FbId,
                    "twId": TWId,
                    "location": {
                        "type": Point,
                        coordinates 
                    }    
                };
                console.log("Values of inputfield & textarea: " + result);

                //makes the connection to the server and send the data 
                var socket = io.connect('http://localhost:3001');
                socket.emit('sendTopic', result);   
                //console.log("Gets send: " + result);
            });

        });

无法提取地理位置键（nodejs和mongo）

3 个答案: