[gatsby-plugin-contentful] How to access fields from other spaces?

[mihaisavezi]

There is a new feature in contentful UI where you can reference fields from other spaces. But when querying for that, I don't get the data I need. Just an identifier.

Example response

"map": {
  "sys": {
    "linkType": "Contentful:Entry",
    "type": "ResourceLink",
    "urn": "crn:contentful:::content:spaces/rc3dlxapnu6k/entries/5cSiNP5EhVvaF2SRoZbIFX"
  }
},

map is a reference field to a different space

i'm trying to query for this in gatsby, at build time

[joerobot]

Hi @mihaisavezi

I've been battling with this too, and needed to create a schema customization to achieve it.

Firstly, I'm assuming you have a second instance of gatsby-source-contentful in gatsby-config.js that points to your other space.

In my case I have a content type EntryLink, with a field contentExternal which accepts a reference from a different contentful space. Here it only accepts the type PressRelease.

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

  const typeDefs = [
    schema.buildObjectType({
      name: "ContentfulEntryLinkContentExternal",
      fields: {
        reference: { // Add a new field called "reference"
          type: "ContentfulPressRelease", // the type of data I am resolving to
          resolve: (source, args, context, info) => {
            return context.nodeModel.findOne({
              type: "ContentfulPressRelease",
              query: {
                filter: { contentful_id: { eq: source.sys.urn.slice(-22) } } // Slice the last 22 chars of the URN to get the contentful_id
              }
            })
          },
        },
      },
    }),
  ]
  createTypes(typeDefs)
}

Find more reading on the Customizing the GraphQL Schema page in the Gatsby Docs, in particular foreign-key fields. If it wasn't for having to extract the contentful ID from the URN, this could be done using the @link directive, which would be much more concise!

[axe312ger]

This feature was not yet requested by Contentful to be implemented into Gatsby. Feel free to open a support ticket at Contentful and request the support for it. This will give weight on the implementation ticket (especially if you paying customer)