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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");
const _ = require("lodash");
exports.createPages = ({ actions, graphql }) => {
const { createPage } = actions;
const blogPostTemplate = path.resolve(`src/templates/blog-post.js`);
return graphql(`
{
allMarkdownRemark(
sort: { order: DESC, fields: [frontmatter___date] }
limit: 1000
) {
edges {
node {
id
frontmatter {
path
}
}
}
}
}
`).then((result) => {
if (result.errors) {
return Promise.reject(result.errors);
}
result.data.allMarkdownRemark.edges.forEach(({ node }) => {
const path = `/${node.frontmatter.path}`;
const { id } = node;
createPage({
path,
component: blogPostTemplate,
context: {
id
} // additional data can be passed via context
});
});
});
};
const fileNodes = [];
exports.onCreateNode = ({ node, actions, getNode }) => {
const { createNodeField } = actions;
fileNodes.push(node);
if (node.internal.type === `MarkdownRemark` || node.internal.type === `Mdx`) {
if (node.frontmatter.cover_image) {
let imagePath;
const foundImageNode = _.find(fileNodes, (file) => {
if (!file.dir) return;
imagePath = path.join(
file.dir,
path.basename(node.frontmatter.cover_image)
);
return path.normalize(file.absolutePath) === imagePath;
});
if (foundImageNode) {
node.frontmatter.cover_image = path.relative(
path.join(node.fileAbsolutePath, ".."),
imagePath
);
}
}
}
if (node.internal.type === `MarkdownRemark`) {
const value = createFilePath({ node, getNode });
createNodeField({
name: `slug`,
node,
value
});
}
};