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@aws-amplify/datastore

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@aws-amplify/datastore

AppSyncLocal support for aws-amplify

  • 5.0.58
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What is @aws-amplify/datastore?

@aws-amplify/datastore is a library that provides a programming model for leveraging shared and distributed data without writing additional code for offline and online scenarios. It is part of the AWS Amplify framework and is designed to work seamlessly with AWS AppSync for real-time and offline-first data access.

What are @aws-amplify/datastore's main functionalities?

Model Definition

Defines the data model schema for the application. This is the first step in setting up DataStore, where you define the structure of your data.

const { initSchema } = require('@aws-amplify/datastore');
const { schema } = require('./schema');

const { Post } = initSchema(schema);

CRUD Operations

Provides basic CRUD (Create, Read, Update, Delete) operations for interacting with the data models. This allows developers to easily manage their data.

const { DataStore } = require('@aws-amplify/datastore');

// Create
await DataStore.save(new Post({ title: 'New Post', content: 'This is a new post' }));

// Read
const posts = await DataStore.query(Post);

// Update
const original = await DataStore.query(Post, '123');
await DataStore.save(Post.copyOf(original, updated => {
  updated.title = 'Updated Title';
}));

// Delete
await DataStore.delete(Post, '123');

Real-time and Offline Sync

Enables real-time data synchronization and offline capabilities. DataStore automatically syncs data between the local store and the cloud, ensuring data consistency.

const { DataStore } = require('@aws-amplify/datastore');

DataStore.observe(Post).subscribe(msg => {
  console.log(msg.model, msg.opType, msg.element);
});

Conflict Resolution

Handles conflict resolution when data changes occur both locally and in the cloud. Developers can define custom conflict resolution strategies.

const { DataStore, syncExpression } = require('@aws-amplify/datastore');

DataStore.configure({
  syncExpressions: [
    syncExpression(Post, () => {
      return post => post.status('eq', 'published');
    })
  ]
});

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Package last updated on 31 Oct 2024

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