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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`)
exports.createPages = ({graphql, actions}) => {
return graphql(
`
{
allMarkdownRemark(sort: {fields: [frontmatter___date], order: DESC}, limit: 1000) {
edges {
node {
fields {
slug
}
frontmatter {
tags
title
}
}
}
}
}
`,
).then(result => {
if (result.errors) {
throw result.errors
}
// Get the templates
const postTemplate = path.resolve(`./src/templates/post.tsx`)
const tagTemplate = path.resolve('./src/templates/tag.tsx')
// Create post 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
actions.createPage({
path: post.node.fields.slug,
component: postTemplate,
context: {
slug: post.node.fields.slug,
previous,
next,
},
})
})
// Iterate through each post, putting all found tags into `tags`
let tags = []
posts.forEach(post => {
if (post.node.frontmatter.tags) {
tags = tags.concat(post.node.frontmatter.tags)
}
})
const uniqTags = [...new Set(tags)]
// Create tag pages
uniqTags.forEach(tag => {
if (!tag) return
actions.createPage({
path: `/tags/${tag}/`,
component: tagTemplate,
context: {
tag,
},
})
})
})
}
exports.onCreateNode = ({node, actions, getNode}) => {
if (node.internal.type === `MarkdownRemark`) {
const value = createFilePath({node, getNode})
actions.createNodeField({
name: `slug`,
node,
value,
})
}
}