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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 = async ({ graphql, actions }) => {
const { createPage } = actions
// Define a template for blog post
// Get all markdown blog posts sorted by date
const result = await graphql(`
query {
blog: allFile(
sort: {
fields: childrenMarkdownRemark___frontmatter___date
order: ASC
}
filter: {
sourceInstanceName: { eq: "blog" }
internal: { mediaType: { eq: "text/markdown" } }
}
) {
nodes {
childMarkdownRemark {
fields {
slug
}
id
}
}
}
events: allFile(
sort: {
fields: childrenMarkdownRemark___frontmatter___date
order: ASC
}
filter: {
sourceInstanceName: { eq: "events" }
internal: { mediaType: { eq: "text/markdown" } }
}
) {
nodes {
childMarkdownRemark {
fields {
slug
}
id
}
}
}
careers: allFile(
sort: {
fields: childrenMarkdownRemark___frontmatter___date
order: ASC
}
filter: {
sourceInstanceName: { eq: "careers" }
internal: { mediaType: { eq: "text/markdown" } }
}
) {
nodes {
childMarkdownRemark {
fields {
slug
}
id
}
}
}
}
`)
// console.log(JSON.stringify(result, null, 2))
if (result.errors) {
reporter.panicOnBuild(`There was an error loading your post`, result.errors)
}
const blogPosts = result.data.blog.nodes
const eventPosts = result.data.events.nodes
const careerPosts = result.data.careers.nodes
const blogPost = path.resolve(`./src/templates/blog-post.js`)
const eventPost = path.resolve(`./src/templates/event-post.js`)
const careerPost = path.resolve(`./src/templates/career-post.js`)
if (blogPosts.length > 0 && eventPosts.length > 0 && careerPosts.length > 0) {
blogPosts.forEach((node, index) => {
const previousId =
index === 0 ? null : blogPosts[index - 1].childMarkdownRemark.id
const nextId =
index === blogPosts.length - 1
? null
: blogPosts[index + 1].childMarkdownRemark.id
// console.log(JSON.stringify(previousPostId, null, 0))
// console.log(JSON.stringify(node.childMarkdownRemark, null, 0))
createPage({
path: node.childMarkdownRemark.fields.slug,
component: blogPost,
context: {
id: node.childMarkdownRemark.id,
previousId,
nextId,
},
})
})
careerPosts.forEach(node => {
createPage({
path: node.childMarkdownRemark.fields.slug,
component: careerPost,
context: {
id: node.childMarkdownRemark.id,
},
})
})
eventPosts.forEach((node, index) => {
const previousId =
index === 0 ? null : eventPosts[index - 1].childMarkdownRemark.id
const nextId =
index === eventPosts.length - 1
? null
: eventPosts[index + 1].childMarkdownRemark.id
createPage({
path: node.childMarkdownRemark.fields.slug,
component: eventPost,
context: {
id: node.childMarkdownRemark.id,
previousId,
nextId,
},
})
})
}
}
exports.onCreateNode = ({ node, actions, getNode }) => {
const { createNodeField } = actions
if (node.internal.type === `MarkdownRemark`) {
const value = createFilePath({ node, getNode })
createNodeField({
name: `slug`,
node,
value,
})
}
}
exports.createSchemaCustomization = ({ actions }) => {
const { createTypes } = actions
// Explicitly define the siteMetadata {} object
// This way those will always be defined even if removed from gatsby-config.js
// Also explicitly define the Markdown frontmatter
// This way the "MarkdownRemark" queries will return `null` even when no
// blog posts are stored inside "content/blog" instead of returning an error
createTypes(`
type SiteSiteMetadata {
author: Author
siteUrl: String
social: Social
}
type Author {
name: String
summary: String
}
type Social {
twitter: String
}
type MarkdownRemark implements Node {
frontmatter: Frontmatter
fields: Fields
}
type Frontmatter {
title: String
description: String
date: Date @dateformat
}
type Fields {
slug: String
}
`)
}
if (typeof document !== `undefined`) {
return {
// Do something with the document
// Call your modules and libraries
}
} else {
return {
// Do something different while window and document are not defined on the server
}
}