#Data Store API

The Data Store API lets you insert your own data into the GraphQL data layer. You will then be able to access it through GraphQL in your components. Use this API if you want to build a custom data source connection or a plugin.

Start by using the api.loadSource() hook in gridsome.server.js:

module.exports = function (api) {
  api.loadSource(store => {
    // Use Data Store API here
  })
}

#Add a content type collection

#store.addContentType(options)

• options object | string Options or just a GraphQL schema type name.

  • typeName string Required GraphQL schema type and template name.
  • route string Optional dynamic route. Read more about Routing

Add a new content type to store.

A Vue component in the src/templates folder with a filename matching the typeName option will be used as a template for all nodes with this type. Read more about templates.

api.loadSource(store => {
  store.addContentType({
    typeName: 'BlogPost',
    route: '/blog/:year/:month/:day/:slug'
  })
})

#store.getContentType(typeName)

• typeName string The GraphQL schema type name.

Get a content type previously created.

#Add nodes to collections

#collection.addNode(options)

• options Object Required.

  • id string A unique id for this content type.
  • ...fields object Custom fields.

api.loadSource(store => {
  const posts = store.addContentType({
    typeName: 'BlogPost',
    route: '/blog/:year/:title'
  })

  posts.addNode({
    title: 'My first blog post',
    date: '2018-11-02',
    customField: 'My value'
  })
})

#Referencing other nodes

#store.createReference(typeName, id)

• typeName string | object The node typeName to reference or the node instance.
• id string | array The node id to reference (or ids if multiple nodes).

A helper function for creating references to other nodes.

This example creates two content types: Author and Post. The author1 and author2 fields on Post will both have a reference to the same author.

api.loadSource(store => {
  const authors = store.addContentType('Author')
  const posts = store.addContentType('Post')

  const author = authors.addNode({
    id: '1',
    title: 'The author'
  })

  posts.addNode({
    title: 'The post',
    author1: store.createReference('Author', '1'),
    author2: store.createReference(author)
  })
})

The field will contain the referenced node fields in the GraphQL schema:

query BlogPost($id: String!) {
  blogPost(id: $id) {
    title
    author1 {
      id
      title
    }
    author2 {
      id
      title
    }
  }
}

#collection.addReference(fieldName, typeName)

• fieldName string The field name.
• typeName string GraphQL schema type to reference.

Make a root field for all nodes in collection referencing to another node.

api.loadSource(store => {
  const posts = store.addContentType('Post')

  posts.addReference('author', 'Author')

  posts.addNode({
    title: 'The post',
    author: '1' // Will become a reference to an author with id '1'
  })
})

#Custom GraphQL fields

#collection.addSchemaField(fieldName, fn)

• fieldName string The field name to create on node.
• fn Function A function which returns an object with a GraphQL field and resolver.

Extend the GraphQL schema with a custom field for a node type.

api.loadSource(store => {
  const posts = store.addContentType('Post')

  posts.addSchemaField('myField', ({ graphql }) => ({
    type: graphql.GraphQLString,
    args: {
      upperCase: { type: graphql.GraphQLBoolean, defaultValue: false }
    },
    resolve (node, args) {
      const value = node.fields.myField

      return args.upperCase
        ? value.toUpperCase()
        : value
    }
  }))
})

query Post($id: String!) {
  blogPost(id: $id) {
    myField(upperCase: true)
  }
}

Read more about GraphQL resolvers.

#Example usage

#Basic

This example creates a MyData content type and just adds a single node to it.

api.loadSource(store => {
  const contentType = store.addContentType({
    typeName: 'MyData'
  })

  contentType.addNode({
    title: 'Lorem ipsum dolor sit amet.',
    customField: '...'
  })
})

You will then be able to query that data in the page-query and static-query tags in your Vue components with a query like this:

query MyData {
  allMyData {
    edges {
      node {
        title
        customField
      }
    }
  }
}

#Fetching external data

You can also fetch external data and add it to the store.

const axios = require('axios')

module.exports = function (api) {
  api.loadSource(async store => {
    const { data } = await axios.get('https://api.example.com/posts')

    const contentType = store.addContentType({
      typeName: 'BlogPosts',
      route: '/blog/:year/:slug'
    })

    for (const item of data) {
      contentType.addNode({
        id: item.id,
        title: item.title,
        slug: item.slug,
        date: item.date,
        content: item.content
      })
    }
  })
}