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August 15, 2018 04:36
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Idea for Dataloader component
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// The `loader` prop is a Dataloader instance | |
// https://github.com/facebook/dataloader | |
class Dataloader extends React.Component { | |
state = {data: null, isLoaded: false}; | |
componentWillMount() { | |
this.prefetchData(this.props); | |
} | |
componentWillReceiveProps(nextProps) { | |
if (this.props.id !== nextProps.id || this.props.loader !== nextProps.loader) { | |
this.setState({isLoaded: false}); | |
this.prefetchData(nextProps); | |
} | |
} | |
async prefetchData(props) { | |
const data = await props.loader.load(props.id); | |
this.setState({data, isLoaded: true}); | |
} | |
render() { | |
return this.props.render(this.state.data, this.state.isLoaded); | |
} | |
} | |
// TODO: Support for loader.loadMany, loader.clear |
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function PostContainer { | |
return ( | |
<Dataloader | |
loader={postLoader} | |
id="123" | |
render={(post, isLoaded) => { | |
if (!isLoaded) { | |
return <Spinner />; | |
} | |
return <Post post={post} />; | |
}} | |
/>; | |
); | |
} |
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I'm also confused about it because of this Dan's SO answer and the React docs about cWM and cDM, so not sure what to do in a case like this.