Question

我已经使用RTM并研究了stackoverflow，但由于有限的文档而仍然失败。我有一个react native realm模式设置，添加了记录。它返回的记录数正确，但是我无法从中获取任何实际记录以进行迭代。

我只是想获取纬度/经度，然后放在react-native-maps上。我想念什么？我的地图工作正常，只是无法从数据库中获取任何坐标返回的记录。

尝试遍历返回的记录/对象似乎是一个非常普遍的问题

Struct.js

import Utils from '../../helpers/utils'; //GUID gen only

class Struct {
    constructor(name, lat, long, country) {
        this.id = Utils.guid();
        this.name = name;
        this.lat = lat;
        this.long = long;
        this.country = country;
    }
}

module.exports = Struct;

dbService.js

import Realm from 'realm';
import Struct from '../schema/Struct';

let repository = new Realm({

    schema: [{
        name: 'Struct',
        primaryKey: 'id',
        properties: {
            id: {type: 'string', indexed: true},
            name: 'string',
            lat: 'string',
            long : 'string',
            country : 'string',
        }
        }],
        schemaVersion: 1   //<--- needed to add this for any schema change, otherwise migration error occurs.   
});


let dbService = {
    getAll: function() {
        //return repository.objects('Struct');
        return repository.objects('Struct').filtered('country="UK"');
    },
    countAll: function() {
        return repository.objects('Struct').length;
    },

  save: function(Struct) {
    //if one already exists in country, dont add it.
    if (repository.objects('Struct').filtered("country = '" + Struct.country + "'").length) return; //if record exists, exit

    repository.write(() => {
        //Struct.updatedAt = new Date();
      repository.create('Struct', Struct);
    })
  },


};

dbService.save(new Struct('Object 1','xx.xxxxx','xxx.xxxxx','UK'));
dbService.save(new Struct('Object 2','xx.xxxxx','xxx.xxxxx','FR'));
dbService.save(new Struct('Object 3','xx.xxxxx','xxx.xxxxx','DE'));
dbService.save(new Struct('Object 4','xx.xxxxx','xxx.xxxxx','NL'));
dbService.save(new Struct('Object 5','xx.xxxxx','xxx.xxxxx','ES'));

module.exports = dbService ;

主应用

var db = require('./db/db/dbService');
let recCount = db.countAll();
console.log(recCount); //<---- This works correctly

let recs = db.getAll();
for (let rec of recs) {
   console.log(rec); //<----- Never runs
}

从console.log()返回的db.getAll()是一个对象，但不是预期的格式，并且似乎是Realm Helper，而不是预期的已过滤对象的列表：

Proxy {Symbol(realm): 162, Symbol(id): 177, …}
[[Handler]]: Object
[[Target]]: Results
[[IsRevoked]]: false

非常感谢

编辑

实际上.. 我说谎countAll()函数返回5条记录，而将dbService.save()行注释为仅1条时，它仍返回5条记录。

React Native Realm通过对象进行迭代

0 个答案: