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next.js/examples/with-apollo/components/PostList.js

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import { gql, graphql } from 'react-apollo'
import ErrorMessage from './ErrorMessage'
import PostUpvoter from './PostUpvoter'
const POSTS_PER_PAGE = 10
function PostList ({ data: { loading, error, allPosts, _allPostsMeta }, loadMorePosts }) {
if (error) return <ErrorMessage message='Error loading posts.' />
if (allPosts && allPosts.length) {
const areMorePosts = allPosts.length < _allPostsMeta.count
return (
<section>
<ul>
{allPosts.map((post, index) =>
<li key={post.id}>
<div>
<span>{index + 1}. </span>
<a href={post.url}>{post.title}</a>
<PostUpvoter id={post.id} votes={post.votes} />
</div>
</li>
)}
</ul>
{areMorePosts ? <button onClick={() => loadMorePosts()}> {loading ? 'Loading...' : 'Show More'} </button> : ''}
<style jsx>{`
section {
padding-bottom: 20px;
}
li {
display: block;
margin-bottom: 10px;
}
div {
align-items: center;
display: flex;
}
a {
font-size: 14px;
margin-right: 10px;
text-decoration: none;
padding-bottom: 0;
border: 0;
}
span {
font-size: 14px;
margin-right: 5px;
}
ul {
margin: 0;
padding: 0;
}
button:before {
align-self: center;
border-style: solid;
border-width: 6px 4px 0 4px;
border-color: #ffffff transparent transparent transparent;
content: "";
height: 0;
margin-right: 5px;
width: 0;
}
`}</style>
</section>
)
}
return <div>Loading</div>
}
const allPosts = gql`
query allPosts($first: Int!, $skip: Int!) {
allPosts(orderBy: createdAt_DESC, first: $first, skip: $skip) {
id
title
votes
url
createdAt
},
_allPostsMeta {
count
}
}
`
// The `graphql` wrapper executes a GraphQL query and makes the results
// available on the `data` prop of the wrapped component (PostList)
export default graphql(allPosts, {
options: {
variables: {
skip: 0,
first: POSTS_PER_PAGE
}
},
props: ({ data }) => ({
data,
loadMorePosts: () => {
return data.fetchMore({
variables: {
skip: data.allPosts.length
},
updateQuery: (previousResult, { fetchMoreResult }) => {
if (!fetchMoreResult) {
return previousResult
}
return Object.assign({}, previousResult, {
// Append the new posts results to the old one
allPosts: [...previousResult.allPosts, ...fetchMoreResult.allPosts]
})
}
})
}
})
})(PostList)