fix(gatsby-source-drupal): Correctly update nodes with changed back r…

…eferences so queries are re-run (gatsbyjs#33328)

packages/gatsby-source-drupal/src/__tests__/fixtures/1593545806.json

@@ -16,6 +16,38 @@
       "id": "does-not-exist",
       "type": "file--file"
     },
+    {
+      "jsonapi": {
+        "version": "1.0",
+        "meta": {
+          "links": {
+            "self": {
+              "href": "http://jsonapi.org/format/1.0/"
+            }
+          }
+        }
+      },
+      "data": {
+        "type": "node--article",
+        "id": "article-9",
+        "attributes": {
+          "id": 24,
+          "uuid": "article-9",
+          "title": "Article #9 - new",
+          "body": "Aliquam non varius libero, sit amet consequat ex. Aenean porta turpis quis vulputate blandit. Suspendisse in porta erat. Sed sit amet scelerisque turpis, at rutrum mauris. Sed tempor eleifend lobortis. Proin maximus, massa sed dignissim sollicitudin, quam risus mattis justo, sit amet aliquam odio ligula quis urna. Interdum et malesuada fames ac ante ipsum primis in faucibus. Ut mollis leo nisi, at interdum urna fermentum ut. Fusce id suscipit neque, eu fermentum lacus. Donec egestas laoreet felis ac luctus. Vestibulum molestie mattis ante, a vulputate nunc ullamcorper at. Ut hendrerit ipsum eget gravida ultricies."
+        },
+        "relationships": {
+          "field_tags": {
+            "data": [
+              {
+                "type": "taxonomy_term--tags",
+                "id": "tag-2"
+              }
+            ]
+          }
+        }
+      }
+    },
     {
       "jsonapi": {
         "version": "1.0",

packages/gatsby-source-drupal/src/__tests__/index.js

@@ -522,6 +522,10 @@ describe(`gatsby-source-drupal`, () => {
         expect(
           nodes[createNodeId(`und.tag-2`)].relationships[`node__article___NODE`]
         ).toContain(createNodeId(`und.article-3`))
+        // Created a new node article-9 with reference to tag-2
+        expect(
+          nodes[createNodeId(`und.tag-2`)].relationships[`node__article___NODE`]
+        ).toContain(createNodeId(`und.article-9`))
       })
     })
   })

packages/gatsby-source-drupal/src/gatsby-node.js

@@ -570,6 +570,7 @@ ${JSON.stringify(webhookBody, null, 4)}
   nodes.forEach(node => {
     handleReferences(node, {
       getNode: nodes.get.bind(nodes),
+      mutateNode: true,
       createNodeId,
       entityReferenceRevisions,
     })

packages/gatsby-source-drupal/src/utils.js

@@ -9,16 +9,17 @@ const {
 
 const { getOptions } = require(`./plugin-options`)
 
-const backRefsNamesLookup = new WeakMap()
-const referencedNodesLookup = new WeakMap()
+const backRefsNamesLookup = new Map()
+const referencedNodesLookup = new Map()
 
 const handleReferences = (
   node,
-  { getNode, createNodeId, entityReferenceRevisions = [] }
+  { getNode, mutateNode = false, createNodeId, entityReferenceRevisions = [] }
 ) => {
   const relationships = node.relationships
   const rootNodeLanguage = getOptions().languageConfig ? node.langcode : `und`
 
+  const backReferencedNodes = []
   if (node.drupal_relationships) {
     const referencedNodes = []
     _.each(node.drupal_relationships, (v, k) => {
@@ -68,6 +69,7 @@ const handleReferences = (
           relationships[nodeFieldName] = referencedNodeId
           referencedNodes.push(referencedNodeId)
         }
+
         // If there's meta on the field and it's not an existing/internal one
         // create a new node's field with that meta. It can't exist on both
         // @see https://jsonapi.org/format/#document-resource-object-fields
@@ -78,11 +80,16 @@ const handleReferences = (
     })
 
     delete node.drupal_relationships
-    referencedNodesLookup.set(node, referencedNodes)
+    referencedNodesLookup.set(node.id, referencedNodes)
     if (referencedNodes.length) {
       const nodeFieldName = `${node.internal.type}___NODE`
       referencedNodes.forEach(nodeID => {
-        const referencedNode = getNode(nodeID)
+        let referencedNode
+        if (mutateNode) {
+          referencedNode = getNode(nodeID)
+        } else {
+          referencedNode = _.cloneDeep(getNode(nodeID))
+        }
         if (!referencedNode.relationships[nodeFieldName]) {
           referencedNode.relationships[nodeFieldName] = []
         }
@@ -91,20 +98,23 @@ const handleReferences = (
           referencedNode.relationships[nodeFieldName].push(node.id)
         }
 
-        let backRefsNames = backRefsNamesLookup.get(referencedNode)
+        let backRefsNames = backRefsNamesLookup.get(referencedNode.id)
         if (!backRefsNames) {
           backRefsNames = []
-          backRefsNamesLookup.set(referencedNode, backRefsNames)
+          backRefsNamesLookup.set(referencedNode.id, backRefsNames)
         }
 
         if (!backRefsNames.includes(nodeFieldName)) {
           backRefsNames.push(nodeFieldName)
         }
+        backReferencedNodes.push(referencedNode)
       })
     }
   }
 
   node.relationships = relationships
+
+  return backReferencedNodes
 }
 
 exports.handleReferences = handleReferences
@@ -117,7 +127,7 @@ const handleDeletedNode = async ({
   createContentDigest,
   entityReferenceRevisions,
 }) => {
-  const deletedNode = getNode(
+  let deletedNode = getNode(
     createNodeId(
       createNodeIdWithVersion(
         node.id,
@@ -135,20 +145,25 @@ const handleDeletedNode = async ({
     return deletedNode
   }
 
+  // Clone node so we're not mutating the original node.
+  deletedNode = _.cloneDeep(deletedNode)
+
   // Remove the deleted node from backRefsNamesLookup and referencedNodesLookup
-  backRefsNamesLookup.delete(deletedNode)
-  referencedNodesLookup.delete(deletedNode)
+  backRefsNamesLookup.delete(deletedNode.id)
+  referencedNodesLookup.delete(deletedNode.id)
 
   // Remove relationships from other nodes and re-create them.
   Object.keys(deletedNode.relationships).forEach(key => {
     let ids = deletedNode.relationships[key]
     ids = [].concat(ids)
     ids.forEach(id => {
-      const node = getNode(id)
+      let node = getNode(id)
 
       // The referenced node might have already been deleted.
       if (node) {
-        let referencedNodes = referencedNodesLookup.get(node)
+        // Clone node so we're not mutating the original node.
+        node = _.cloneDeep(node)
+        let referencedNodes = referencedNodesLookup.get(node.id)
         if (referencedNodes?.includes(deletedNode.id)) {
           // Loop over relationships and cleanup references.
           Object.entries(node.relationships).forEach(([key, value]) => {
@@ -174,7 +189,7 @@ const handleDeletedNode = async ({
           referencedNodes = referencedNodes.filter(
             nId => nId !== deletedNode.id
           )
-          referencedNodesLookup.set(node, referencedNodes)
+          referencedNodesLookup.set(node.id, referencedNodes)
         }
 
         // Recreate the referenced node with its now cleaned-up relationships.
@@ -230,33 +245,46 @@ ${JSON.stringify(nodeToUpdate, null, 4)}
 
   const nodesToUpdate = [newNode]
 
-  handleReferences(newNode, {
+  const oldNodeReferencedNodes = referencedNodesLookup.get(newNode.id)
+  const backReferencedNodes = handleReferences(newNode, {
     getNode,
+    mutateNode: false,
     createNodeId,
     entityReferenceRevisions: pluginOptions.entityReferenceRevisions,
   })
 
-  const oldNode = getNode(newNode.id)
+  nodesToUpdate.push(...backReferencedNodes)
+
+  let oldNode = getNode(newNode.id)
   if (oldNode) {
+    // Clone node so we're not mutating the original node.
+    oldNode = _.cloneDeep(oldNode)
     // copy over back references from old node
-    const backRefsNames = backRefsNamesLookup.get(oldNode)
+    const backRefsNames = backRefsNamesLookup.get(oldNode.id)
     if (backRefsNames) {
-      backRefsNamesLookup.set(newNode, backRefsNames)
+      backRefsNamesLookup.set(newNode.id, backRefsNames)
       backRefsNames.forEach(backRefFieldName => {
         newNode.relationships[backRefFieldName] =
           oldNode.relationships[backRefFieldName]
       })
     }
 
-    const oldNodeReferencedNodes = referencedNodesLookup.get(oldNode)
-    const newNodeReferencedNodes = referencedNodesLookup.get(newNode)
+    const newNodeReferencedNodes = referencedNodesLookup.get(newNode.id)
 
     // see what nodes are no longer referenced and remove backRefs from them
-    const removedReferencedNodes = _.difference(
+    let removedReferencedNodes = _.difference(
       oldNodeReferencedNodes,
       newNodeReferencedNodes
     ).map(id => getNode(id))
 
+    removedReferencedNodes = removedReferencedNodes.map(node => {
+      if (node) {
+        return _.cloneDeep(node)
+      } else {
+        return node
+      }
+    })
+
     nodesToUpdate.push(...removedReferencedNodes)
 
     const nodeFieldName = `${newNode.internal.type}___NODE`
@@ -271,23 +299,9 @@ ${JSON.stringify(nodeToUpdate, null, 4)}
           )
       }
     })
-
-    // see what nodes are newly referenced, and make sure to call `createNode` on them
-    const addedReferencedNodes = _.difference(
-      newNodeReferencedNodes,
-      oldNodeReferencedNodes
-    ).map(id => getNode(id))
-
-    nodesToUpdate.push(...addedReferencedNodes)
-  } else {
-    // if we are inserting new node, we need to update all referenced nodes
-    const newNodes = referencedNodesLookup.get(newNode)
-    if (typeof newNodes !== `undefined`) {
-      newNodes.forEach(id => nodesToUpdate.push(getNode(id)))
-    }
   }
 
-  // download file
+  // Download file.
   const { skipFileDownloads } = pluginOptions
   if (isFileNode(newNode) && !skipFileDownloads) {
     await downloadFile(