fix(payload): #6800, #5108 - graphql query concurrency issues (#6857)

Fixes #6800 and #5108 by improving the `isolateObjectProperty` utility
function and flattening `req.transactionID` and
`req.transactionIDPromise` to a single `req.transactionID` property.

test/dataloader/config.ts

@@ -57,6 +57,48 @@ export default buildConfigWithDefaults({
         },
       ],
     },
+    {
+      fields: [
+        {
+          name: 'name',
+          type: 'text',
+        },
+        {
+          name: 'items',
+          type: 'relationship',
+          relationTo: 'items',
+          hasMany: true,
+        },
+      ],
+      slug: 'shops',
+      access: { read: () => true },
+    },
+    {
+      fields: [
+        {
+          name: 'name',
+          type: 'text',
+        },
+        {
+          name: 'itemTags',
+          type: 'relationship',
+          relationTo: 'itemTags',
+          hasMany: true,
+        },
+      ],
+      slug: 'items',
+      access: { read: () => true },
+    },
+    {
+      fields: [
+        {
+          name: 'name',
+          type: 'text',
+        },
+      ],
+      slug: 'itemTags',
+      access: { read: () => true },
+    },
   ],
   onInit: async (payload) => {
     const user = await payload.create({
@@ -72,6 +114,19 @@ export default buildConfigWithDefaults({
       collection: 'posts',
       data: postDoc,
     })
+
+    const tag = await payload.create({
+      collection: 'itemTags',
+      data: { name: 'tag1' },
+    })
+    const item = await payload.create({
+      collection: 'items',
+      data: { name: 'item1', itemTags: [tag.id] },
+    })
+    const shop = await payload.create({
+      collection: 'shops',
+      data: { name: 'shop1', items: [item.id] },
+    })
   },
 })
 

test/dataloader/int.spec.ts

@@ -31,6 +31,35 @@ describe('dataloader', () => {
       if (loginResult.token) token = loginResult.token
     })
 
+    it('should allow multiple parallel queries', async () => {
+      for (let i = 0; i < 100; i++) {
+        const query = `
+          query {
+            Shops {
+              docs {
+                name
+                items {
+                  name
+                }
+              }
+            }
+            Items {
+              docs {
+                name
+                itemTags {
+                  name
+                }
+              }
+            }
+          }`
+        const response = await client.request(query)
+        expect(response).toStrictEqual({
+          Shops: { docs: [{ name: 'shop1', items: [{ name: 'item1' }] }] },
+          Items: { docs: [{ name: 'item1', itemTags: [{ name: 'tag1' }] }] },
+        })
+      }
+    })
+
     it('should allow querying via graphql', async () => {
       const query = `query {
         Posts {