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gatsby-node.js
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gatsby-node.js
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const path = require(`path`);
const _ = require('lodash');
const { createFilePath } = require(`gatsby-source-filesystem`);
exports.createPages = async ({ graphql, actions }) => {
const { createPage } = actions;
const blogPost = path.resolve(`./src/templates/blog-post.js`);
const tagTemplate = path.resolve('src/templates/tags.js');
const result = await graphql(
`
{
allMarkdownRemark(
sort: { fields: [frontmatter___date], order: DESC }
limit: 1000
) {
edges {
node {
fields {
slug
}
frontmatter {
title
tags
}
}
}
}
tagsGroup: allMarkdownRemark(limit: 2000) {
group(field: frontmatter___tags) {
fieldValue
}
}
}
`
);
if (result.errors) {
throw result.errors;
}
// Create blog posts pages.
const posts = result.data.allMarkdownRemark.edges;
posts.forEach((post, index) => {
const previous =
index === posts.length - 1 ? null : posts[index + 1].node;
const next = index === 0 ? null : posts[index - 1].node;
createPage({
path: '/writing' + post.node.fields.slug,
component: blogPost,
context: {
slug: post.node.fields.slug,
previous,
next,
},
});
});
// Extract tag data from query
const tags = result.data.tagsGroup.group;
tags.forEach((tag) => {
createPage({
path: `/tags/${_.kebabCase(tag.fieldValue)}/`,
component: tagTemplate,
context: {
tag: tag.fieldValue,
},
});
});
};
exports.onCreateNode = ({ node, actions, getNode }) => {
const { createNodeField } = actions;
if (node.internal.type === `MarkdownRemark`) {
const value = createFilePath({ node, getNode });
createNodeField({
name: `slug`,
node,
value,
});
}
};