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* Update with-apollo examples to include note about top-level withData HOC * Update with-apollo examples to include note about top-level withData HOC
54 lines
2.5 KiB
Markdown
54 lines
2.5 KiB
Markdown
[](https://deploy.now.sh/?repo=https://github.com/zeit/next.js/tree/master/examples/with-apollo)
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# Apollo Example
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## Demo
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https://next-with-apollo.now.sh
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## How to use
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### Using `create-next-app`
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Download [`create-next-app`](https://github.com/segmentio/create-next-app) to bootstrap the example:
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```bash
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npx create-next-app --example with-apollo with-apollo-app
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# or
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yarn create next-app --example with-apollo with-apollo-app
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```
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### Download manually
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Download the example [or clone the repo](https://github.com/zeit/next.js):
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```bash
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curl https://codeload.github.com/zeit/next.js/tar.gz/canary | tar -xz --strip=2 next.js-canary/examples/with-apollo
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cd with-apollo
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```
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Install it and run:
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```bash
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npm install
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npm run dev
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```
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Deploy it to the cloud with [now](https://zeit.co/now) ([download](https://zeit.co/download)):
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```bash
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now
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```
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## The idea behind the example
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[Apollo](http://dev.apollodata.com) is a GraphQL client that allows you to easily query the exact data you need from a GraphQL server. In addition to fetching and mutating data, Apollo analyzes your queries and their results to construct a client-side cache of your data, which is kept up to date as further queries and mutations are run, fetching more results from the server.
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In this simple example, we integrate Apollo seamlessly with Next by wrapping our *pages* inside a [higher-order component (HOC)](https://facebook.github.io/react/docs/higher-order-components.html). Using the HOC pattern we're able to pass down a central store of query result data created by Apollo into our React component hierarchy defined inside each page of our Next application.
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On initial page load, while on the server and inside `getInitialProps`, we invoke the Apollo method, [`getDataFromTree`](http://dev.apollodata.com/react/server-side-rendering.html#getDataFromTree). This method returns a promise; at the point in which the promise resolves, our Apollo Client store is completely initialized.
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This example relies on [graph.cool](https://www.graph.cool) for its GraphQL backend.
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### Note:
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In these *with-apollo* examples, the ```withData()``` HOC must wrap a top-level component from within the ```pages``` directory. Wrapping a child component with the HOC will result in a ```Warning: Failed prop type: The prop 'serverState' is marked as required in 'WithData(Apollo(Component))', but its value is 'undefined'``` error. Down-tree child components will have access to Apollo, and can be wrapped with any other sort of ```graphql()```, ```compose()```, etc HOC's.
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