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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, reporter }) => {
const { createPage } = actions
// Define a template for blog post
const blogPost = path.resolve(`./src/templates/blog-post-contentful.js`)
// Get all markdown blog posts sorted by date
const result = await graphql(
`
{
allContentfulPost {
edges {
node {
slug
title
}
}
}
}
`
)
if (result.errors) {
reporter.panicOnBuild(
`There was an error loading your blog posts`,
result.errors
)
return
}
const posts = result.data.allContentfulPost.edges
// Create blog posts pages
// But only if there's at least one markdown file found at "content/blog" (defined in gatsby-config.js)
// `context` is available in the template as a prop and as a variable in GraphQL
if (posts.length > 0) {
posts.forEach((post, index) => {
const previousSlug = index === 0 ? null : posts[index - 1].node.slug
const previousTitle = index === 0 ? null : posts[index - 1].node.title
const nextSlug = index === posts.length - 1 ? null : posts[index + 1].node.slug
const nextTitle = index === posts.length - 1 ? null : posts[index + 1].node.title
createPage({
path: post.node.slug,
component: blogPost,
context: {
slug: post.node.slug,
previous: {
slug: previousSlug,
title: previousTitle
},
next: {
slug: nextSlug,
title: nextTitle
},
},
})
})
}
}
// 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
}
`)
}