javascript - 尝试更新 LokiJS db 但出现 'Trying to update unsynced document' 错误

Question

尝试在 Loki JS 中动态添加他们拥有的人和水果的条目，但我不断收到 Trying to update unsynced document. Please save the document first by using insert() or addMany()错误。有人对如何成功做到这一点有任何想法吗？

我已经记录了传入的值，它们与数据库中已经找到的值相匹配。

const loki = require('lokijs');

const db = new loki('loki.json');

const peopleAndFruits = db.addCollection('peopleAndFruits');

peopleAndFruits.insert({ dbname: 'person', fruits: 10 });

const createOrInsertUserToDb = (name, fruitNumber) => {
    const data = peopleAndFruits.find({ dbname: name });
    console.log('db entry before updated ', data[0].dbname);
    if (data[0].dbname !== name) {
        // console.log('this person did not exist in our database');
        peopleAndFruits.insert({ dbname: name, fruits: fruitNumber });
    } else {
        // console.log('previously existing entry');
        peopleAndFruits.update({
            dbname: data[0].dbname,
            fruits: Number(fruitNumber + data.fruits),
        });
    }
    // console.log('data after update or insert', peopleAndFruits.data);
    db.saveDatabase();
};

Answer 1

我偶然发现了这个问题，问题是当调用 peopleAndFruits.update 时，您传递的文档需要是集合中的现有项目，这意味着它必须有一个 $loki id。就你而言，你可以选择

peopleAndFruits.update({
  ...data[0],
  fruits: +fruitNumber + fruits;
});

或

peopleAndFruits.findAndUpdate({$loki: data[0].$loki}, item => {
  item.fruits = +fruitNumber + fruits;
});