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gatsby-node.js
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gatsby-node.js
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const _ = require('lodash')
const path = require('path')
const { createFilePath } = require('gatsby-source-filesystem')
const createPaginatedPages = require('gatsby-paginate')
exports.createPages = ({ actions, graphql }) => {
const { createPage } = actions
return graphql(`
{
allMarkdownRemark(limit: 1000, sort: { order: DESC, fields: [frontmatter___date] }) {
edges {
node {
excerpt(pruneLength: 400)
id
fields {
slug
}
frontmatter {
title
cover
tags
templateKey
date(formatString: "MMMM DD, YYYY")
}
}
}
}
}
`).then(result => {
if (result.errors) {
result.errors.forEach(e => console.error(e.toString()))
return Promise.reject(result.errors)
}
const postsAndPages = result.data.allMarkdownRemark.edges
// Post pages:
let posts = []
// Iterate through each post/page, putting all found posts (where templateKey = article-page) into `posts`
postsAndPages.forEach(edge => {
if (_.isMatch(edge.node.frontmatter, { templateKey: 'article-page' })) {
posts = posts.concat(edge)
}
})
createPaginatedPages({
edges: posts,
createPage: createPage,
pageTemplate: 'src/templates/blog.js',
pageLength: 6, // This is optional and defaults to 10 if not used
pathPrefix: 'blog', // This is optional and defaults to an empty string if not used
context: {}, // This is optional and defaults to an empty object if not used
})
postsAndPages.forEach(edge => {
const id = edge.node.id
createPage({
path: edge.node.fields.slug,
tags: edge.node.frontmatter.tags,
component: path.resolve(
`src/templates/${String(edge.node.frontmatter.templateKey)}.js`
),
// additional data can be passed via context
context: {
id,
},
})
})
// Tag pages:
let tags = []
// Iterate through each post, putting all found tags into `tags`
postsAndPages.forEach(edge => {
if (_.get(edge, `node.frontmatter.tags`)) {
tags = tags.concat(edge.node.frontmatter.tags)
}
})
// Eliminate duplicate tags
tags = _.uniq(tags)
// Make tag pages
tags.forEach(tag => {
const tagPath = `/tags/${_.kebabCase(tag)}/`
createPage({
path: tagPath,
component: path.resolve(`src/templates/tags.js`),
context: {
tag,
},
})
})
})
}
exports.onCreateNode = ({ node, actions, getNode }) => {
const { createNodeField } = actions
if (node.internal.type === `MarkdownRemark`) {
const value = createFilePath({ node, getNode })
createNodeField({
name: `slug`,
node,
value,
})
}
}