Revert "Enable filtering on linked nodes" (gatsbyjs#3613)

* Revert "Fix images disappearing from rendered markdown files (gatsbyjs#3612)"

This reverts commit 01022ab.

* Revert "Bundle Netlify CMS styles (gatsbyjs#3611)"

This reverts commit d19ec31.

* Revert "Publish"

This reverts commit 53f66a4.

* Revert "Update comment"

This reverts commit 2b22c2c.

* Revert "Enable filtering on linked nodes (gatsbyjs#3600)"

This reverts commit 7120e5a.

packages/gatsby/src/schema/__tests__/infer-graphql-input-type-test.js

@@ -482,33 +482,4 @@ describe(`GraphQL Input args`, () => {
 
     expect(result).toMatchSnapshot()
   })
-
-  it(`filters on linked fields`, async () => {
-    const { store, getNodes } = require(`../../redux`)
-    const linkedNodeType = new GraphQLObjectType({
-      name: `Bar`,
-      fields: {
-        id: { type: GraphQLString },
-      },
-    })
-    let types = [{ name: `Bar`, nodeObjectType: linkedNodeType }]
-
-    store.dispatch({
-      type: `CREATE_NODE`,
-      payload: { id: `baz`, internal: { type: `Bar` } },
-    })
-
-    let result = await queryResult(
-      [...getNodes(), { linked___NODE: `baz`, foo: `bar` }],
-      `
-        {
-          allNode(filter: { linked: { id: { eq: "baz" } } }) {
-            edges { node { linked { id } } }
-          }
-        }
-      `,
-      { types }
-    )
-    expect(result.data.allNode.edges[0].node.linked.id).toEqual(`baz`)
-  })
 })

packages/gatsby/src/schema/infer-graphql-input-fields.js

@@ -19,8 +19,6 @@ const {
   isEmptyObjectOrArray,
 } = require(`./data-tree-utils`)
 
-const { findLinkedNode } = require(`./infer-graphql-type`)
-
 import type {
   GraphQLInputFieldConfig,
   GraphQLInputFieldConfigMap,
@@ -203,11 +201,8 @@ export function inferInputObjectStructureFromNodes({
     // setting traversing up not try to automatically infer them.
     if (isRoot && EXCLUDE_KEYS[key]) return
 
-    // Infer input arguments for linked nodes
-    if (_.includes(key, `___NODE`)) {
-      value = findLinkedNode(value)
-      ;[key] = key.split(`___`)
-    }
+    // Input arguments on linked fields aren't currently supported
+    if (_.includes(key, `___NODE`)) return
 
     let field = inferGraphQLInputFields({
       nodes,

packages/gatsby/src/schema/infer-graphql-type.js

@@ -252,7 +252,7 @@ function inferFromMapping(
   }
 }
 
-export function findLinkedNode(value, linkedField, path) {
+function findLinkedNode(value, linkedField, path) {
   let linkedNode
   // If the field doesn't link to the id, use that for searching.
   if (linkedField) {