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on-node-create.js
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on-node-create.js
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const grayMatter = require(`gray-matter`)
const crypto = require(`crypto`)
const _ = require(`lodash`)
module.exports = async function onCreateNode({
node,
getNode,
loadNodeContent,
boundActionCreators,
}) {
const { createNode, createParentChildLink } = boundActionCreators
// We only care about markdown content.
if (
node.internal.mediaType !== `text/markdown` &&
node.internal.mediaType !== `text/x-markdown`
) {
return
}
const content = await loadNodeContent(node)
let data = grayMatter(content)
// Convert date objects to string. Otherwise there's type mismatches
// during inference as some dates are strings and others date objects.
if (data.data) {
data.data = _.mapValues(data.data, v => {
if (_.isDate(v)) {
return v.toJSON()
} else {
return v
}
})
}
const contentDigest = crypto
.createHash(`md5`)
.update(JSON.stringify(data))
.digest(`hex`)
const markdownNode = {
id: `${node.id} >>> MarkdownRemark`,
children: [],
parent: node.id,
internal: {
content,
contentDigest,
type: `MarkdownRemark`,
},
}
// Add ___PARENT to sub-object in the frontmatter so we can
// use this to find the root markdown node when running GraphQL
// queries. Yes this is lame. But it's because in GraphQL child nodes
// can't access their parent nodes so we use this ___PARENT convention
// to get around this.
_.each(data.data, (v, k) => {
if (_.isArray(v) && _.isObject(v[0])) {
data.data[k] = v.map(o => {
return { ...o, ___PARENT: node.id }
})
}
})
markdownNode.frontmatter = {
title: ``, // always include a title
...data.data,
___PARENT: node.id,
// TODO Depreciate this at v2 as much larger chance of conflicting with a
// user supplied field.
parent: node.id,
}
// Add path to the markdown file path
if (node.internal.type === `File`) {
markdownNode.fileAbsolutePath = node.absolutePath
}
createNode(markdownNode)
createParentChildLink({ parent: node, child: markdownNode })
}