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gatsby-node.js
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gatsby-node.js
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// gatsby-node.js API documentation:
// https://www.gatsbyjs.com/docs/node-apis/
const path = require('path');
const { createFilePath } = require('gatsby-source-filesystem');
// Create the property "node.fields.slug" for all MarkdownRemark nodes
// Store the file's name as a slug
exports.onCreateNode = ({ node, getNode, actions }) => {
const { createNodeField } = actions;
if (node.internal.type === 'MarkdownRemark') {
const slug = createFilePath({ node, getNode, basePath: 'pages' });
createNodeField({
node,
name: 'slug',
value: slug,
});
}
};
// Log errors to the console if a GraphQL
// query fails during a build
const queryWrapper = promise =>
promise.then(result => {
if (result.errors) {
throw result.errors;
}
return result;
});
// Query all MarkdownRemark files and assign them to the variable "results".
// Then, loop over the results array and create a page for each markdown file.
// Render each of these pages using the BlogPost.jsx component.
// Pass the previous and next blog post title through props.pageContext
exports.createPages = async ({ graphql, actions }) => {
const { createPage } = actions;
const result = await queryWrapper(
graphql(`
{
blogPosts: allMarkdownRemark(
sort: { fields: [frontmatter___date], order: ASC }
) {
edges {
node {
fields {
slug
}
frontmatter {
title
}
}
}
}
}
`)
);
const posts = result.data.blogPosts.edges;
posts.forEach(({ node }, index) => {
const prev = index === 0 ? null : posts[index - 1].node;
const next = index === posts.length - 1 ? null : posts[index + 1].node;
createPage({
path: `blog${node.fields.slug}`,
component: path.resolve('./src/templates/BlogPost.jsx'),
context: {
slug: node.fields.slug,
prev,
next,
},
});
});
};