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gatsby-node.js
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gatsby-node.js
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const path = require('path')
exports.createPages = async ({ graphql, actions, reporter }) => {
const { createPage } = actions
const result = await graphql(`
query {
allContentfulProject {
edges {
node {
title
slug
}
}
}
}
`)
if (result.errors) {
reporter.panicOnBuild(
`There was an error loading your Contentful projects`,
result.errors
)
return
}
const projects = result.data.allContentfulProject.edges
// Create blog posts pages
// But only if there's at least one blog post found in Contentful
// `context` is available in the template as a prop and as a variable in GraphQL
if (projects.length > 0) {
projects.forEach((project, index) => {
const previousProjectSlug = index === 0 ? null : projects[index - 1].slug
const nextProjectSlug =
index === projects.length - 1 ? null : projects[index + 1].slug
createPage({
path: `/projects/${project.node.slug}/`,
component: path.resolve('./src/templates/project.js'),
context: {
slug: project.node.slug,
previousProjectSlug,
nextProjectSlug,
},
})
})
}
}