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gatsby-node.js
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gatsby-node.js
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const chalk = require('chalk');
exports.createPages = ({graphql, actions}, pluginOptions) => {
const {createRedirect} = actions;
const markdownQuery = pluginOptions.query || 'allMarkdownRemark';
return new Promise((resolve, reject) => {
resolve(
graphql(`
{
q: ${markdownQuery}(
filter: {
frontmatter: {
redirect_from: {
ne: null
}
}
}
) {
edges {
node {
frontmatter {
redirect_from
slug
}
}
}
}
}
`).then(result => {
if (result.errors) {
console.log(result.errors);
reject(result.errors);
}
const allPosts = result.data.q.edges;
const redirects = [];
// For all posts with redirect_from frontmatter,
// extract all values and push to redirects array
allPosts.forEach(post => {
redirects.push({
from: post.node.frontmatter.redirect_from,
to: post.node.frontmatter.slug,
permanent: post.node.frontmatter.permanent ? post.node.frontmatter.permanent : false,
});
});
// Create redirects from the just constructed array
redirects.forEach(({from, to, permanent}) => {
// iterate through all `from` array items
from.forEach(from => {
createRedirect({
fromPath: from,
toPath: to,
isPermanent: permanent,
redirectInBrowser: true,
});
});
});
resolve(
console.log(`${chalk.green('success')} create redirects`), // eslint-disable-line no-console
);
}),
);
});
};