From 90769267acce461f547a8879f63ad3b93ed81470 Mon Sep 17 00:00:00 2001
From: Sasha <64744993+r1tsuu@users.noreply.github.com>
Date: Mon, 28 Oct 2024 22:55:15 +0200
Subject: [PATCH 1/2] add test

---
 test/joins/int.spec.ts | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/test/joins/int.spec.ts b/test/joins/int.spec.ts
index d700379dda8..69cde56d9db 100644
--- a/test/joins/int.spec.ts
+++ b/test/joins/int.spec.ts
@@ -617,6 +617,24 @@ describe('Joins Field', () => {
       expect(response.data.Category.relatedPosts.docs[0].title).toStrictEqual('test 3')
     })
   })
+
+  it('should work id.in querying with joins', async () => {
+    const allCategories = await payload.find({ collection: 'categories', pagination: false })
+
+    const allCategoriesByIds = await restClient
+      .GET(`/categories`, {
+        query: {
+          where: {
+            id: {
+              in: allCategories.docs.map((each) => each.id),
+            },
+          },
+        },
+      })
+      .then((res) => res.json())
+
+    expect(allCategories.totalDocs).toBe(allCategoriesByIds.totalDocs)
+  })
 })
 
 async function createPost(overrides?: Partial<Post>, locale?: Config['locale']) {

From 94d8b8b8c16573e7a3a93ffd524e104844fd35b1 Mon Sep 17 00:00:00 2001
From: Sasha <64744993+r1tsuu@users.noreply.github.com>
Date: Mon, 28 Oct 2024 23:31:28 +0200
Subject: [PATCH 2/2] fix(db-mongodb): id in querying using a comma-delimited
 value

---
 packages/db-mongodb/src/queries/sanitizeQueryValue.ts | 6 +++++-
 test/joins/int.spec.ts                                | 4 ++--
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/packages/db-mongodb/src/queries/sanitizeQueryValue.ts b/packages/db-mongodb/src/queries/sanitizeQueryValue.ts
index 8d0d1e4f349..037028969b1 100644
--- a/packages/db-mongodb/src/queries/sanitizeQueryValue.ts
+++ b/packages/db-mongodb/src/queries/sanitizeQueryValue.ts
@@ -78,7 +78,11 @@ export const sanitizeQueryValue = ({
           return { operator: formattedOperator, val: undefined }
         }
       }
-    } else if (Array.isArray(val)) {
+    } else if (Array.isArray(val) || (typeof val === 'string' && val.split(',').length > 1)) {
+      if (typeof val === 'string') {
+        formattedValue = createArrayFromCommaDelineated(val)
+      }
+
       formattedValue = formattedValue.reduce((formattedValues, inVal) => {
         const newValues = [inVal]
         if (!hasCustomID) {
diff --git a/test/joins/int.spec.ts b/test/joins/int.spec.ts
index 69cde56d9db..9fa1cef6e69 100644
--- a/test/joins/int.spec.ts
+++ b/test/joins/int.spec.ts
@@ -618,7 +618,7 @@ describe('Joins Field', () => {
     })
   })
 
-  it('should work id.in querying with joins', async () => {
+  it('should work id.in command delimited querying with joins', async () => {
     const allCategories = await payload.find({ collection: 'categories', pagination: false })
 
     const allCategoriesByIds = await restClient
@@ -626,7 +626,7 @@ describe('Joins Field', () => {
         query: {
           where: {
             id: {
-              in: allCategories.docs.map((each) => each.id),
+              in: allCategories.docs.map((each) => each.id).join(','),
             },
           },
         },