AWS Amplify Datastore AppSync 不同步 IndexDB 与 DynamoDB

问题描述

我关注了this tutorial。在我将 aws-amplify 更新到 v3.3.26 之前，它运行良好。更新后，它停止将 IndexDB 与 DynamoDB 同步。我设置 Amplify.Logger.LOG_LEVEL = 'DEBUG' 时没有任何错误。

在 main.ts 的教程之后，我有：

import Amplify from "@aws-amplify/core";
import {DataStore} from "@aws-amplify/datastore";
import awsExports from "./aws-exports";

Amplify.configure(awsExports);

之后我从 Amplify UI 中提取数据，我生成了 GraphQl 模型和 src/aws-exports.js

const awsmobile = {
    "aws_project_region": "REGION","aws_appsync_graphqlEndpoint": "https://xxxxxxxxxxx.appsync-api.REGION.amazonaws.com/graphql","aws_appsync_region": "REGION","aws_appsync_authenticationType": "API_KEY","aws_appsync_apiKey": "xxx-xxxxxxxxxxxxxxxxxx","aws_cognito_identity_pool_id": "REGION:xxxxx-xxxxxx-xxxxx-xxxxxxx-xxxxxxx","aws_cognito_region": "REGION","aws_user_pools_id": "REGION_xxxxxxxx","aws_user_pools_web_client_id": "xxxxxxxxxxxxxxxxx","oauth": {},"aws_content_delivery_bucket": "BUCKET","aws_content_delivery_bucket_region": "us-east-2","aws_content_delivery_url": "http://BUCKET.s3-website.REGION.amazonaws.com"
};```

And I tried to update data like this:

await DataStore.save(User.copyOf(data,(item:MutableModel) => { item.phone = data.phone; }));```

解决方法

为了修复它，我将 main.ts 更改为：

src/main.ts

import awsconfig from './aws-exports'
import PubSub from '@aws-amplify/pubsub';
import API from '@aws-amplify/api';
import Amplify,{ Logger } from 'aws-amplify';
import {DataStore} from '@aws-amplify/datastore';

API.configure(awsconfig);
PubSub.configure(awsconfig);
Amplify.configure(awsconfig);
DataStore.configure(awsconfig);
Logger.LOG_LEVEL = 'ERROR';
DataStore.start();

现在我每次编辑数据时都需要订阅模型更改。

src/app/user/edit-user.component.ts

import {DataStore} from '@aws-amplify/datastore';
import {User} from '../models';


@Component({
  selector: 'app-edit-page',templateUrl: './edit-page.component.html',styleUrls: ['./edit-page.component.scss']
})
export class EditPageComponent implements OnInit {
  subscription;

  ngOnInit() {
    this.subscription = DataStore.observe<User>(User).subscribe(() => {});
  }
  async update(data) {
    await DataStore.save(User.copyOf(data,(item:MutableModel<User>) => {
      item.phone = data.phone;
    }));
  }
  ngOnDestroy() {
    if (this.subscription) this.subscription.unsubscribe();
  }
}