gatsby-node.js

const _ = require("lodash")
const {paginate} = require("gatsby-awesome-pagination");
exports.createPages = async ({ actions,graphql }) => {
  const { createPage } = actions
  const blogPostTemplate = require.resolve(`./src/templates/blog-page.js`)
  const blogPostPagedTemplate = require.resolve(`./src/templates/index.js`)
  const pageTemplate = require.resolve(`./src/templates/page.js`)

  return graphql(`
     {
      tagsGroup: allMarkdownRemark(limit: 2000) {
        group(field: {frontmatter: {tag: SELECT}}) {
          fieldValue
        }
      }
      authorsGroup: allMarkdownRemark(limit: 2000) {
        group(field: {frontmatter: {author: SELECT}}) {
          fieldValue
        }
      }
      blogPosts: allMarkdownRemark(
        filter: {frontmatter: {type: {eq: "post"}}}
        sort: {frontmatter: {date: DESC}}
        limit: 1000
      ) {
        edges {
          node {
            id
            frontmatter {
              date
              permalink
              title
            }
          }
        }
      }
      blogPages: allMarkdownRemark(
        filter: {frontmatter: {type: {eq: "page"}}}
        sort: {frontmatter: {date: DESC}}
        limit: 1000
      ) {
        edges {
          node {
            id
            frontmatter {
              date
              permalink
              title
            }
          }
        }
      }
    }
  `).then(result => {
    if (result.errors) {
      return Promise.reject(result.errors)
    }
    result.data.blogPosts.edges.forEach(({node}) => {
      createPage({
        path: node.frontmatter.permalink,
        component: blogPostTemplate,
        context: {
          slug: node.frontmatter.permalink,
          id: node.id
        },
      });
    });
    result.data.blogPages.edges.forEach(({node}) => {
      createPage({
        path: node.frontmatter.permalink,
        component: pageTemplate,
        context: {
          slug: node.frontmatter.permalink,
          id: node.id
        },
      });
    });
    const tags = result.data.tagsGroup.group
    const tagTemplate = require.resolve("./src/templates/tags.js")

    // Make tag pages
    tags.forEach(tag => {
      createPage({
        path: `/tags/${_.kebabCase(tag.fieldValue)}/`,
        component: tagTemplate,
        context: {
          tag: tag.fieldValue,
        },
      })
    });
    const author = result.data.authorsGroup.group
    const authorTemplate = require.resolve("./src/templates/authors.js")
    // Make tag pages
    author.forEach(author => {
      createPage({
        path: `/authors/${_.kebabCase(author.fieldValue)}/`,
        component: authorTemplate,
        context: {
          author: author.fieldValue,
        },
      })
    });


    paginate({
      createPage: createPage,
      component: blogPostPagedTemplate,
      items: result.data.blogPosts.edges,
      itemsPerPage: 12,
      itemsPerFirstPage: 12,
      pathPrefix: '/'
    })
  });
}