Community Plugin

gatsby-schema-field-absolute-path

This plugin resolves absolute path (i.e content/assets) to the correct File node in your Gatsby graphql schema.

For example, if you have a content structure like this

root
  |--content
  |     |--posts
  |     |   `--hello-world.md
  |     `--assets
  |         |--cat.jpg
  |         `--cat2.png
  |--src
  |--gatsby-config.js
 ...

And in hello-world.md, you have this frontmatter

---
slug: hello-word
featuredImage: assets/cat.jpg
---

What a nice day!

This plugin will resolve assets/cat.jpg to a File node instead of a string, so you can query the image as expected:

query PostContent {
  frontmatter {
    featuredImage {
      childImageSharp {
        fluid(maxWidth: 1280) {
          ...gatsbyImageSharpFluid
        }
      }
    }
  }
}

Of course this is not done by magic, you’d have to add the generated field extension to your field via createTypes in gatsby-node.js.

// gatsby-node.js

exports.createSchemaCustomization = ({ actions }) => {
  const { createTypes } = actions

  // @fileByDataPath and @fileByAbsolutePath are 
  // field extensions generated by this plugin
  const typeDefs = `
    type Frontmatter @infer {
      attachment: File @fileByAbsolutePath(path: "content/attachment")
    }

    ${ /* Alternatively, define path via config. See options below */ }    
    type Frontmatter @infer {
      featureImage: File @fileByDataPath
    }

    type MarkdownRemark implements Node @infer {
      frontmatter: Frontmatter
    }
  `

  createTypes(typeDefs)
}

Multiple Images

Wait, what if you have an array of images instead?

  slug: hello-word
- featuredImage: assets/cat.jpg
+ featuredImages: 
+   - assets/cat.jpg
+   - assets/cat2.png

No problems, just modify your gql slightly:

  type Frontmatter @infer {
-   featuredImage: File @fileByAbsolutePath(path: "content/assets")
+   featuredImages: [File] @fileByAbsolutePath(path: "content/assets")
  }

How It Works

I published a post on how this work over here: link

Usage

Install

yarn add gatsby-schema-field-absolute-path

# or
npm i gatsby-schema-field-absolute-path

Add to Gatsby config

// gatsby-config.js

module.exports = {
  plugins: [
    // 1. No custom dirs
    'gatsby-schema-field-absolute-path',
    // 2. With custom dirs:
    {
      resolve: 'gatsby-schema-field-absolute-path',
      options: {
        // a. single directory
        dirs: 'content/assets'

        // b. array of directories
        dirs: ['content/assets', 'src/processed/images']

        // or c. object with named field extension
        dirs: {
          'content/assets': 'fileByAssetPath',
          'src/processed/images': 'fileByImagePath',
        }
      }
    }
  ]
}

Specify target fields

// gatsby-node.js

exports.createSchemaCustomization = ({ actions }) => {
  const { createTypes } = actions

  const typeDefs = `
    type Frontmatter @infer {

      ${/* without configuration */}
      featureImage: File @fileByAbsolutePath(path: "content/asset")
      
      ${/* or with configuration */}
      featureImage: File @fileByAssetPath
    }

    type MarkdownRemark implements Node @infer {
      frontmatter: Frontmatter
    }
  `

  createTypes(typeDefs)
}

How to Use

By default, this plugin create a generic field extension called fileByAbsolutePath. It accepts a path arguments, which allow finding file relative to the directory root:

root
  |--content
  |     |--posts
  |     |   `--hello-world.md
  |     `--assets
  |         `--cat.jpg
  |--src
  |--gatsby-config.js
 ...

`
  type Frontmatter @infer {
    featuredImage: File @fileByAbsolutePath(path: "content/assets")
  }
`

You may also specify an option dirs, which accepts a string, an array of string, or an object. This plugin can generate multiple field extensions each targeting a specific directory, saving you some keystrokes if you have a lot of fields targeting files in different directories.

type Path = string
type FieldExtensionName = string

interface Options {
  dirs: Path | Path[] | Record<Path, FieldExtensionName>
}

The path must be relative to your root directory. For example, src / /src / ./src will all resolve to <project root>/src.
The field extension name is generated automatically by the directory:

directory	generated field extension name
`content/posts`	`pathByPostsPath`
`content/assets`	`pathByAssetsPath`

If you’re unsure what the generated name maybe, this plugin will tell you in development:

info gatsby-plugin-file-absolute-path: Field extension created! Use @fileByDataPath for 'src/data'

If you pass an object to dir, you can specify the field extension name instead of generated one:

// option
dirs: { 'content/assets': 'myFieldExtensionName' }

// usage
`
  type Frontmatter @infer {
    featuredImage: File @myFieldExtensionName
  }
`