[英]How to use AMAZON_COGNITO_USER_POOLS with apollo-client
[英]How to use localStorage with apollo-client and reactjs?
我需要使用 reactjs 和 apollo-client 为在线商店制作购物车。 如何使用带有 localStorage 的 apollo-client 保存数据?
是的,您可以使用 localStorage 来持久化 Apollo Client 缓存。 apollo-cache-persist可用于所有 Apollo Client 2.0 缓存实现,包括 InMemoryCache 和 Hermes。
这是一个工作示例,它展示了如何使用Apollo GraphQL 客户端管理本地状态以及如何使用apollo-cache-persist将缓存持久化到 localStorage 中。
import React from 'react';
import ReactDOM from 'react-dom';
import { ApolloClient } from 'apollo-client';
import { InMemoryCache } from 'apollo-cache-inmemory';
import { createHttpLink } from 'apollo-link-http';
import { ApolloProvider } from '@apollo/react-hooks';
import { persistCache } from 'apollo-cache-persist';
import { typeDefs } from './graphql/schema';
import { resolvers } from './graphql/resolvers';
import { GET_SELECTED_COUNTRIES } from './graphql/queries';
import App from './components/App';
const httpLink = createHttpLink({
uri: 'https://countries.trevorblades.com'
});
const cache = new InMemoryCache();
const init = async () => {
await persistCache({
cache,
storage: window.localStorage
});
const client = new ApolloClient({
link: httpLink,
cache,
typeDefs,
resolvers
});
/* Initialize the local state if not yet */
try {
cache.readQuery({
query: GET_SELECTED_COUNTRIES
});
} catch (error) {
cache.writeData({
data: {
selectedCountries: []
}
});
}
const ApolloApp = () => (
<ApolloProvider client={client}>
<App />
</ApolloProvider>
);
ReactDOM.render(<ApolloApp />, document.getElementById('root'));
};
init();
你可以在我的 GitHub Repo上找到这个例子。
顺便说一下,该应用程序如下所示:
它的 localStorage 在 Chrome DevTools 中如下所示:
文档: https : //github.com/apollographql/apollo-cache-persist
import { InMemoryCache } from 'apollo-cache-inmemory';
import { persistCache } from 'apollo-cache-persist';
const cache = new InMemoryCache({...});
// await before instantiating ApolloClient, else queries might run before the cache is persisted
await persistCache({
cache,
storage: window.localStorage,
});
// Continue setting up Apollo as usual.
const client = new ApolloClient({
cache,
...
});
我知道我有点晚了,但我找到了一种使用最新版本处理此问题的完美方法: apollo3-cache-persist
这是我的代码:(记得导入这些模块)
const cache = new InMemoryCache();
const client = new ApolloClient({
//your settings here
});
const initData = {
//your initial state
}
client.writeData({
data: initData
});
//persistCache is asynchronous so it returns a promise which you have to resolve
persistCache({
cache,
storage: window.localStorage
}).then(() => {
client.onResetStore(async () => cache.writeData({
data: initData
}));
});
如需更多信息,请阅读此处的文档,它将帮助您快速设置。
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