How to manually set graphql type / link to existing nodes

[peonmodel]

i see that infer-graphql-type.js will automatically inferObjectStructureFromNodes to create links between nodes
such that an .md file with frontmatter (image: '11.jpg') will return from graphql as frontmatter.image = { id: ${dir}/11.jpg }

is it possible to manually create the links on onCreateNode or something similar?

[KyleAMathews]

Yes, you can can use createNodeField with the not-yet-documented ___NODE syntax to create links between nodes.

Something like.

createNodeField({
  node,
  name: `nodeLink___NODE`,
  value: `ID_OF_ANOTHER_NODE`
})

The auto-linking to file nodes is a special case that relies on relative links between file nodes. When you create links like above, you need to use the actual ID of the node you're trying to link to.

[peonmodel]

i keep having this error message

UNHANDLED REJECTION Invariant Violation: Encountered an error trying to infer a GraphQL type for: "internal.fieldOwners.nodeOtherLink___NODE". There is no corresponding node with the id field matching: "default-site-plugin"

it comes from

{ contentDigest: '3d75edb4822a6bbdc0d47f3aa1b28e0b',
  type: 'MetadataJson',
  owner: 'gatsby-transformer-json',
  fieldOwners: { nodeOtherLink___NODE: 'default-site-plugin' } }

[toxsick]

I have the same problem as @peonmodel. Trying to create a node field on a SitePage node with

createNodeField({
  node,
  name: 'source___NODE',
  value: jsFrontmatterNode.id
});

but I'm getting

Error: Invariant Violation: Encountered an error trying to infer a GraphQL type for: "internal.fieldOwners.source___NODE". There is no corresponding node with the id field   matching: "default-site-plugin"

what's wrong?

[toxsick]

My code is something like this:

exports.onCreateNode = ({ node, getNode, boundActionCreators }) => {
  const { createNodeField } = boundActionCreators;
  if (node.internal.type === 'SitePage') {
    const jsFrontmatterNode = getNode(`${node.component} absPath of file >>> JSFrontmatter`);
    if (jsFrontmatterNode) {
      createNodeField({
        node,
        name: 'source___NODE',
        value: jsFrontmatterNode.id
      });
    }
  }
};