如何在 Realm Database JavaScript 中保存数据

Question

我是反应原生的新手，并为我的应用程序使用 realm 数据库。我想通过 json 预填充我的数据。我尝试使用componentDidMount((函数并使用for循环来插入数据。任何指导都会有所帮助。

以下是我的代码：

架构文件：

import booksdata from './books.json';
const Realm = require('realm');
const BooksSchema = {
name: 'Books',
primaryKey: 'id',
properties: {
id: 'int', // primary key
name: 'string',
author: 'string',
publisher: 'string',
},
};
const databaseSchema = {
path: 'books.realm',
schema: [BooksSchema],
schemaVersion: 0, // optional
};
export const mountData = () => new Promise((resolve, reject) => {
Realm.open(databaseSchema)
.then((realm) => {
// Create Realm objects and write to local storage
realm.write(() => {
booksdata.forEach(obj => realm.create(databaseSchema, {
id: Math.floor(Date.now() / 1000),
name: obj.name,
author: obj.author,
publisher: obj.publisher,
}));
});
});
});

在我的索引文件中，称为 componentDidMount ：

componentDidMount() {
mountData().then().catch((error) => {
alert(`Insert error ${error}`);
});
}

我收到以下警告

Possible Unhandled Promise Rejection (id: 0):
Error: objectType must be of type 'string', got ([object Object])
Error: objectType must be of type 'string', got ([object Object])
at sendRequest (blob:http://localhost:8081/d198fbe8-8b32-4037-93a7-df5a46af4f15:62352:45)
at sendRequest (blob:http://localhost:8081/d198fbe8-8b32-4037-93a7-df5a46af4f15:62385:24)
at Object.callMethod (blob:http://localhost:8081/d198fbe8-8b32-4037-93a7-df5a46af4f15:62128:22)
at Realm.<anonymous> (blob:http://localhost:8081/d198fbe8-8b32-4037-93a7-df5a46af4f15:61983:28)
at blob:http://localhost:8081/d198fbe8-8b32-4037-93a7-df5a46af4f15:61408:15
at tryCallOne (blob:http://localhost:8081/d198fbe8-8b32-4037-93a7-df5a46af4f15:16056:14)
at blob:http://localhost:8081/d198fbe8-8b32-4037-93a7-df5a46af4f15:16157:17
at blob:http://localhost:8081/d198fbe8-8b32-4037-93a7-df5a46af4f15:2884:21
at _callTimer (blob:http://localhost:8081/d198fbe8-8b32-4037-93a7-df5a46af4f15:2773:9)
at _callImmediatesPass (blob:http://localhost:8081/d198fbe8-8b32-4037-93a7-df5a46af4f15:2809:9)

Answer 1

您可以将 JSON 数据解析为 JavaScript 对象，但这些对象必须与您的架构匹配。

let objs = JSON.parse(data);
realm.write(() => {
objs.forEach((obj) => realm.create('data', obj));
}

其中'data'是架构的名称。

Answer 2

谢谢你们！ 我犯了一个非常愚蠢的错误。在我的架构文件中，当我在领域中插入记录时，我没有传递我的架构的名称。而不是数据库模式，我应该传递模式的名称，即 BooksSchema.name(书籍(

export const mountData = () => new Promise((resolve, reject) => {
Realm.open(databaseSchema)
.then((realm) => {
// Create Realm objects and write to local storage
realm.write(() => {
booksdata.forEach(obj => realm.create(BooksSchema.name, {
id: Math.floor(Date.now() / 1000),
name: obj.name,
author: obj.author,
publisher: obj.publisher,
}));
});
});
});