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gatsby-node.js
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gatsby-node.js
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const path = require('path');
const { createFilePath } = require('gatsby-source-filesystem');
const getSlug = (post) => post.node.fields.slug;
const getTitle = (post) => post.node.frontmatter.title;
const extractPostData = (post) =>
post && {
slug: getSlug(post),
title: getTitle(post),
};
const getPreviousPost = (posts, index) => {
const previousPost = index === posts.length - 1 ? null : posts[index + 1];
return extractPostData(previousPost);
};
const getNextPost = (posts, index) => {
const nextPost = index === 0 ? null : posts[index - 1];
return extractPostData(nextPost);
};
exports.createPages = ({ actions, graphql }) => {
const { createPage } = actions;
return new Promise((resolve, reject) => {
graphql(
`
{
allMarkdownRemark(
sort: { fields: [frontmatter___date], order: DESC }
limit: 1000
) {
edges {
node {
fields {
slug
}
frontmatter {
title
}
}
}
}
}
`
).then((result) => {
if (result.errors) {
reject(result.errors);
}
const posts = result.data.allMarkdownRemark.edges;
posts.forEach((post, index) => {
const slug = getSlug(post);
createPage({
path: slug,
component: path.resolve('./src/templates/BlogPost.js'),
context: {
next: getNextPost(posts, index),
previous: getPreviousPost(posts, index),
slug,
},
});
});
resolve(result);
});
});
};
exports.onCreateNode = ({ actions, getNode, node }) => {
const { createNodeField } = actions;
if (node.internal.type === 'MarkdownRemark') {
const slug = createFilePath({ getNode, node });
createNodeField({
name: 'slug',
node,
value: slug,
});
}
};