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zenflow and timneutkens withApollo example - move from old HOC APIs to new function-as-child …
…APIs (#5241)

Since version 2.1, react-apollo is exposing some new components that use the function-as-child (or render-prop) pattern to let you connect apollo-client magic with your components. See the blog article: [New in React Apollo 2.1](https://www.apollographql.com/docs/react/react-apollo-migration.html)

If I'm not mistaken, it's generally agreed that this pattern is (where it works) superior to the HOC pattern, for reasons that are best explained here: https://cdb.reacttraining.com/use-a-render-prop-50de598f11ce 

So I updated the with-apollo example to use the new API, and IMO this code is much simpler and natural to read and understand, especially if you are not already familiar with Apollo's HOC APIs.

I broke up my changes into separate commits, for easier review. Commits with "Refactor" in the message accomplish the goal of switching to the new APIs while minimizing line-by-line differences (select "Hide whitespace changes" under "Diff settings"). Commits with "Clean up" in the message follow up the refactoring with trivial things like reorganizing code sections, renaming variables, etc.

For the components doing mutations, I chose not to use the `Mutation` component, since that doesn't really make sense to me; a mutation is something that happens at a point in time, so it's not meaningful to represent a mutation in the markup, which exists for a period of time. All that component does is expose a `mutate` function for a single specified mutation, and `result` data for a single firing of the mutation (which we don't need anyways; apollo handles updating the local data with the result). To me it seems simpler and more flexible to just get the apollo client via `ApolloConsumer` and call `.mutate()` on it. 

In case anyone is interested, here's what my version of `PostUpvoter` using the `Mutation` component looked like:

 <details>

```jsx
import React from 'react'
import { Mutation } from 'react-apollo'
import { gql } from 'apollo-boost'

export default function PostUpvoter ({ votes, id }) {
  return (
    <Mutation mutation={upvotePost}>
      {mutate => (
        <button onClick={() => upvote(id, votes + 1, mutate)}>
          {votes}
          <style jsx>{`
            button {
              background-color: transparent;
              border: 1px solid #e4e4e4;
              color: #000;
            }
            button:active {
              background-color: transparent;
            }
            button:before {
              align-self: center;
              border-color: transparent transparent #000000 transparent;
              border-style: solid;
              border-width: 0 4px 6px 4px;
              content: '';
              height: 0;
              margin-right: 5px;
              width: 0;
            }
          `}</style>
        </button>
      )}
    </Mutation>
  )
}

const upvotePost = gql`
  mutation updatePost($id: ID!, $votes: Int) {
    updatePost(id: $id, votes: $votes) {
      id
      __typename
      votes
    }
  }
`
function upvote (id, votes, mutate) {
  mutate({
    variables: { id, votes },
    optimisticResponse: {
      __typename: 'Mutation',
      updatePost: {
        __typename: 'Post',
        id,
        votes
      }
    }
  })
}
```

</details>

###

I'm happy with where things are at here, but I'm more than happy to address any comments, concerns, ideas for improvent!

Thanks!
Latest commit 7961946 Sep 26, 2018

README.md

Deploy to now

Apollo Example

Demo

https://next-with-apollo.now.sh

How to use

Using create-next-app

Execute create-next-app with Yarn or npx to bootstrap the example:

npx create-next-app --example with-apollo with-apollo-app
# or
yarn create next-app --example with-apollo with-apollo-app

Download manually

Download the example:

curl https://codeload.github.com/zeit/next.js/tar.gz/canary | tar -xz --strip=2 next.js-canary/examples/with-apollo
cd with-apollo

Install it and run:

npm install
npm run dev
# or
yarn
yarn dev

Deploy it to the cloud with now (download):

now

The idea behind the example

Apollo 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.

In this simple example, we integrate Apollo seamlessly with Next by wrapping our pages/_app.js inside a higher-order component (HOC). 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.

On initial page load, while on the server and inside getInitialProps, we invoke the Apollo method, getDataFromTree. This method returns a promise; at the point in which the promise resolves, our Apollo Client store is completely initialized.

This example relies on graph.cool for its GraphQL backend.

Note: Do not be alarmed that you see two renders being executed. Apollo recursively traverses the React render tree looking for Apollo query components. When it has done that, it fetches all these queries and then passes the result to a cache. This cache is then used to render the data on the server side (another React render). https://www.apollographql.com/docs/react/features/server-side-rendering.html#getDataFromTree