id	title
react-relay-offline	Getting Started

React Relay Offline

React Relay Offline is a extension of Relay for offline capabilities

Installation React Web

Install react-relay and react-relay-offline using yarn or npm:

yarn add react-relay react-relay-offline

Installation React Native

Install react-relay and react-relay-offline using yarn or npm:

yarn add @react-native-community/netinfo react-relay react-relay-offline

You then need to link the native parts of the library for the platforms you are using. The easiest way to link the library is using the CLI tool by running this command from the root of your project:

react-native link @react-native-community/netinfo

Main Additional Features

automatic persistence and rehydration of the store (AsyncStorage, localStorage, IndexedDB)
configuration of persistence
- custom storage
- different key prefix (multi user)
- serialization: JSON or none
fetchPolicy network-only, store-and-network, store-or-network, store-only
management and utilities for network detection
automatic use of the polity store-only when the application is offline
optimization in store management and addition of TTL to queries in the store
offline mutation management
- backup of mutation changes
- update and publication of the mutation changes in the store
- persistence of mutation information performed
- automatic execution of mutations persisted when the application returns online
- configurability of the offline mutation execution network
- onComplete callback of the mutation performed successfully
- onDiscard callback of the failed mutation

Contributing

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Create issues, your questions are a valuable help
PRs are welcome, but it is always better to open the issue first so as to help me and other people evaluating it
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React Web Example

The react-relay-offline-examples repository contains an integration of react-relay-offline. To try it out:

git clone https://github.com/morrys/react-relay-offline-example.git
cd react-relay-offline-example/todo
yarn
yarn build
yarn start

Then, just point your browser at http://localhost:3000.

git clone https://github.com/morrys/react-relay-offline-example.git
cd react-relay-offline-example/todo-updater
yarn
yarn build
yarn start

Then, just point your browser at http://localhost:3000.

React NextJS Offline SSR Example

The React NextJS Offline SSR Example

React Native Example

The react native offline example

Environment

import { Network } from "relay-runtime";
import { RecordSource, Store, Environment } from "react-relay-offline";

const network = Network.create(fetchQuery);
const recordSource = new RecordSource();
const store = new Store(recordSource);
const environment = new Environment({ network, store });

Environment with Offline Options

import { Network } from "relay-runtime";
import { RecordSource, Store, Environment } from "react-relay-offline";

const network = Network.create(fetchQuery);

const networkOffline = Network.create(fetchQueryOffline);
const manualExecution = false;

const recordSource = new RecordSource();
const store = new Store(recordSource);
const environment = new Environment({ network, store });
environment.setOfflineOptions({
  manualExecution, //optional
  network: networkOffline, //optional
  start: async mutations => {
    //optional
    console.log("start offline", mutations);
    return mutations;
  },
  finish: async (mutations, error) => {
    //optional
    console.log("finish offline", error, mutations);
  },
  onExecute: async mutation => {
    //optional
    console.log("onExecute offline", mutation);
    return mutation;
  },
  onComplete: async options => {
    //optional
    console.log("onComplete offline", options);
    return true;
  },
  onDiscard: async options => {
    //optional
    console.log("onDiscard offline", options);
    return true;
  },
  onPublish: async offlinePayload => {
    //optional
    console.log("offlinePayload", offlinePayload);
    return offlinePayload;
  }
});

manualExecution: if set to true, mutations in the queue are no longer performed automatically as soon as you go back online. invoke manually: environment.getStoreOffline().execute();
network: it is possible to configure a different network for the execution of mutations in the queue; all the information of the mutation saved in the offline store are inserted into the "metadata" field of the CacheConfig so that they can be used during communication with the server.

start: function that is called once the request queue has been started.
finish: function that is called once the request queue has been processed.
onExecute: function that is called before the request is sent to the network.
onPublish: function that is called before saving the mutation in the store
onComplete: function that is called once the request has been successfully completed. Only if the function returns the value true, the request is deleted from the queue.
onDiscard: function that is called when the request returns an error. Only if the function returns the value true, the mutation is deleted from the queue

IndexedDB

localStorage is used as the default react web persistence, while AsyncStorage is used for react-native.

To use persistence via IndexedDB:

import { Network } from "relay-runtime";
import EnvironmentIDB from "react-relay-offline/lib/runtime/EnvironmentIDB";

const network = Network.create(fetchQuery);
const environment = EnvironmentIDB.create({ network });

Environment with PersistOfflineOptions

import { Network } from "relay-runtime";
import { RecordSource, Store, Environment } from "react-relay-offline";
import { CacheOptions } from "@wora/cache-persist";

const network = Network.create(fetchQuery);

const networkOffline = Network.create(fetchQueryOffline);

const persistOfflineOptions: CacheOptions = {
  prefix: "app-user1"
};
const recordSource = new RecordSource();
const store = new Store(recordSource);
const environment = new Environment({ network, store }, persistOfflineOptions);

CacheOptions

Store with custom options

import { Store } from "react-relay-offline";
import { CacheOptions } from "@wora/cache-persist";
import { CacheOptionsStore } from "@wora/relay-store";

const persistOptionsStore: CacheOptionsStore = { defaultTTL: 10 * 60 * 1000 }; // default
const persistOptionsRecords: CacheOptions = {}; // default
const recordSource = new RecordSource(persistOptionsRecords);
const store = new Store(recordSource, persistOptionsStore);
const environment = new Environment({ network, store });

QueryRenderer

Add "cached" property in render function
Add "ttl" property in order to change default ttl in store
fetchPolicy determine whether it should use data cached in the Relay store and whether to send a network request. The options are:
- store-or-network (default): Reuse data cached in the store; if the whole query is cached, skip the network request
- store-and-network: Reuse data cached in the store; always send a network request.
- network-only: Don't reuse data cached in the store; always send a network request. (This is the default behavior of Relay's existing QueryRenderer.)
- store-only: Reuse data cached in the store; never send a network request.

import { QueryRenderer } from 'react-relay-offline';

<QueryRenderer
        environment={environment}
        query={query}
        variables={{}}
        fetchPolicy='store-or-network'
        ttl={100000}
        render={({ props, error, retry, cached }) => {

useRestore & loading

the useRestore hook allows you to manage the restore of data persisted in the storage. To be used if relay components are used outside of the QueryRenderer or for web applications without SSR & react-native (

const isRehydrated = useRestore(environment);
   if (!isRehydrated) {
     return <Loading />;
   }

For SSR web applications there is a native management in the QueryRenderer to correctly manage the DOM returned by the server and restore the environment

fetchQuery

import { fetchQuery } from "react-relay-offline";

Mutation

import { commitMutation, graphql } from "react-relay-offline";

Detect Network

import { useIsConnected } from "react-relay-offline";
import { useNetInfo } from "react-relay-offline";
import { NetInfo } from "react-relay-offline";

Hooks & useQuery

Now you can use hooks (useFragment, usePagination, useRefetch) from relay-hooks

while it is necessary to use useQuery of react-relay-offline to manage the offline.

import { useQuery } from "react-relay-offline";
const hooksProps = useQuery(query, variables, {
  networkCacheConfig: cacheConfig,
  fetchPolicy,
  ttl
});

Requirement

Version >=6.0.0 of the react-relay library
When a new node is created by mutation the id must be generated in the browser to use it in the optimistic response

License

React Relay Offline is MIT licensed.

cem2ran / react-relay-offline