chore: uses defaultLocale for local operations locale and fallbackLocale

src/collections/operations/local/create.ts

@@ -44,10 +44,11 @@ export default async function createLocal<T = any>(payload: Payload, options: Op
   } = options;
 
   const collection = payload.collections[collectionSlug];
+  const defaultLocale = payload?.config?.localization ? payload?.config?.localization?.defaultLocale : null;
 
   req.payloadAPI = 'local';
-  req.locale = locale || req?.locale || (payload?.config?.localization ? payload?.config?.localization?.defaultLocale : null);
-  req.fallbackLocale = fallbackLocale || req?.fallbackLocale || null;
+  req.locale = locale ?? req?.locale ?? defaultLocale;
+  req.fallbackLocale = fallbackLocale ?? req?.fallbackLocale ?? defaultLocale;
   req.payload = payload;
   req.i18n = i18n(payload.config.i18n);
   req.files = {

src/collections/operations/local/delete.ts

@@ -22,20 +22,21 @@ export default async function deleteLocal<T extends TypeWithID = any>(payload: P
     collection: collectionSlug,
     depth,
     id,
-    locale = payload.config.localization ? payload.config.localization?.defaultLocale : null,
-    fallbackLocale = null,
+    locale,
+    fallbackLocale,
     user,
     overrideAccess = true,
     showHiddenFields,
   } = options;
 
   const collection = payload.collections[collectionSlug];
+  const defaultLocale = payload?.config?.localization ? payload?.config?.localization?.defaultLocale : null;
 
   const req = {
     user,
     payloadAPI: 'local',
-    locale,
-    fallbackLocale,
+    locale: locale ?? defaultLocale,
+    fallbackLocale: fallbackLocale ?? defaultLocale,
     payload,
     i18n: i18n(payload.config.i18n),
   } as PayloadRequest;

src/collections/operations/local/find.ts

@@ -48,10 +48,11 @@ export default async function findLocal<T extends TypeWithID = any>(payload: Pay
   } = options;
 
   const collection = payload.collections[collectionSlug];
+  const defaultLocale = payload?.config?.localization ? payload?.config?.localization?.defaultLocale : null;
 
   req.payloadAPI = 'local';
-  req.locale = locale || req?.locale || (payload?.config?.localization ? payload?.config?.localization?.defaultLocale : null);
-  req.fallbackLocale = fallbackLocale || req?.fallbackLocale || null;
+  req.locale = locale ?? req?.locale ?? defaultLocale;
+  req.fallbackLocale = fallbackLocale ?? req?.fallbackLocale ?? defaultLocale;
   req.i18n = i18n(payload.config.i18n);
   req.payload = payload;
 

src/collections/operations/local/findByID.ts

@@ -39,10 +39,11 @@ export default async function findByIDLocal<T extends TypeWithID = any>(payload:
   } = options;
 
   const collection = payload.collections[collectionSlug];
+  const defaultLocale = payload?.config?.localization ? payload?.config?.localization?.defaultLocale : null;
 
   req.payloadAPI = 'local';
-  req.locale = locale || req?.locale || (payload?.config?.localization ? payload?.config?.localization?.defaultLocale : null);
-  req.fallbackLocale = fallbackLocale || req?.fallbackLocale || null;
+  req.locale = locale ?? req?.locale ?? defaultLocale;
+  req.fallbackLocale = fallbackLocale ?? req?.fallbackLocale ?? defaultLocale;
   req.i18n = i18n(payload.config.i18n);
   req.payload = payload;
 

src/collections/operations/local/findVersionByID.ts

@@ -24,8 +24,8 @@ export default async function findVersionByIDLocal<T extends TypeWithVersion<T>
     collection: collectionSlug,
     depth,
     id,
-    locale = payload.config.localization ? payload.config.localization?.defaultLocale : null,
-    fallbackLocale = null,
+    locale,
+    fallbackLocale,
     overrideAccess = true,
     disableErrors = false,
     showHiddenFields,
@@ -33,10 +33,11 @@ export default async function findVersionByIDLocal<T extends TypeWithVersion<T>
   } = options;
 
   const collection = payload.collections[collectionSlug];
+  const defaultLocale = payload?.config?.localization ? payload?.config?.localization?.defaultLocale : null;
 
   req.payloadAPI = 'local';
-  req.locale = locale || req?.locale || this?.config?.localization?.defaultLocale;
-  req.fallbackLocale = fallbackLocale || req?.fallbackLocale || null;
+  req.locale = locale ?? req?.locale ?? defaultLocale;
+  req.fallbackLocale = fallbackLocale ?? req?.fallbackLocale ?? defaultLocale;
   req.i18n = i18n(payload.config.i18n);
   req.payload = payload;
 

src/collections/operations/local/findVersions.ts

@@ -28,8 +28,8 @@ export default async function findVersionsLocal<T extends TypeWithVersion<T> = a
     page,
     limit,
     where,
-    locale = payload.config.localization ? payload.config.localization?.defaultLocale : null,
-    fallbackLocale = null,
+    locale,
+    fallbackLocale,
     user,
     overrideAccess = true,
     showHiddenFields,
@@ -37,13 +37,14 @@ export default async function findVersionsLocal<T extends TypeWithVersion<T> = a
   } = options;
 
   const collection = payload.collections[collectionSlug];
+  const defaultLocale = payload?.config?.localization ? payload?.config?.localization?.defaultLocale : null;
 
   const i18n = i18nInit(payload.config.i18n);
   const req = {
     user,
     payloadAPI: 'local',
-    locale,
-    fallbackLocale,
+    locale: locale ?? defaultLocale,
+    fallbackLocale: fallbackLocale ?? defaultLocale,
     payload,
     i18n,
   } as PayloadRequest;

src/collections/operations/local/update.ts

@@ -28,8 +28,8 @@ export default async function updateLocal<T = any>(payload: Payload, options: Op
   const {
     collection: collectionSlug,
     depth,
-    locale = payload.config.localization ? payload.config.localization?.defaultLocale : null,
-    fallbackLocale = null,
+    locale,
+    fallbackLocale,
     data,
     id,
     user,
@@ -44,12 +44,13 @@ export default async function updateLocal<T = any>(payload: Payload, options: Op
 
   const collection = payload.collections[collectionSlug];
   const i18n = i18nInit(payload.config.i18n);
+  const defaultLocale = payload.config.localization ? payload.config.localization?.defaultLocale : null;
 
   const req = {
     user,
     payloadAPI: 'local',
-    locale,
-    fallbackLocale,
+    locale: locale ?? defaultLocale,
+    fallbackLocale: fallbackLocale ?? defaultLocale,
     payload,
     i18n,
     files: {

test/localization/collections/Array/index.ts

@@ -0,0 +1,21 @@
+import type { CollectionConfig } from '../../../../src/collections/config/types';
+
+export const arrayCollectionSlug = 'array-fields';
+
+export const ArrayCollection: CollectionConfig = {
+  slug: arrayCollectionSlug,
+  fields: [
+    {
+      name: 'items',
+      type: 'array',
+      localized: true,
+      fields: [
+        {
+          name: 'text',
+          type: 'text',
+          required: true,
+        },
+      ],
+    },
+  ],
+};

test/localization/config.ts

@@ -1,6 +1,6 @@
 import { buildConfig } from '../buildConfig';
 import { devUser } from '../credentials';
-import { GlobalArray } from './Array';
+import { ArrayCollection } from './collections/Array';
 import { LocalizedPost, RelationshipLocalized } from './payload-types';
 import {
   defaultLocale,
@@ -36,6 +36,7 @@ export default buildConfig({
   localization: {
     locales: [defaultLocale, spanishLocale],
     defaultLocale,
+    fallback: true,
   },
   collections: [
     {
@@ -65,27 +66,7 @@ export default buildConfig({
         },
       ],
     },
-    {
-      slug: 'arrays',
-      fields: [
-        {
-          type: 'text',
-          name: 'requiredText',
-          localized: true,
-        },
-        {
-          type: 'array',
-          name: 'arrayFields',
-          localized: true,
-          fields: [
-            {
-              name: 'text',
-              type: 'text',
-            },
-          ],
-        },
-      ],
-    },
+    ArrayCollection,
     {
       slug: withRequiredLocalizedFields,
       fields: [

test/localization/int.spec.ts

@@ -22,8 +22,9 @@ import {
   spanishTitle,
 } from './shared';
 import type { Where } from '../../src/types';
+import { arrayCollectionSlug } from './collections/Array';
 
-const collection = config.collections[1]?.slug;
+const collection = slug;
 
 let serverURL;
 
@@ -199,6 +200,7 @@ describe('Localization', () => {
       });
     });
   });
+
   describe('Localized Relationship', () => {
     let localizedRelation: LocalizedPost;
     let localizedRelation2: LocalizedPost;
@@ -650,6 +652,73 @@ describe('Localization', () => {
       expect(result.title[spanishLocale]).toStrictEqual(spanishTitle);
     });
   });
+
+  describe('Localized - Arrays', () => {
+    let docID;
+
+    beforeAll(async () => {
+      const englishDoc = await payload.create({
+        collection: arrayCollectionSlug,
+        data: {
+          items: [
+            {
+              text: englishTitle,
+            },
+          ],
+        },
+      });
+
+      docID = englishDoc.id;
+    });
+
+    it('should use default locale as fallback', async () => {
+      const spanishDoc = await payload.findByID({
+        locale: spanishLocale,
+        collection: arrayCollectionSlug,
+        id: docID,
+      });
+
+      expect(spanishDoc.items[0].text).toStrictEqual(englishTitle);
+    });
+
+    it('should use empty array as value', async () => {
+      const updatedSpanishDoc = await payload.update({
+        collection: arrayCollectionSlug,
+        locale: spanishLocale,
+        id: docID,
+        data: {
+          items: [],
+        },
+      });
+
+      expect(updatedSpanishDoc.items).toStrictEqual([]);
+    });
+
+    it('should use fallback value if setting null', async () => {
+      await payload.update({
+        collection: arrayCollectionSlug,
+        locale: spanishLocale,
+        id: docID,
+        data: {
+          items: [],
+        },
+      });
+
+      const updatedSpanishDoc = await payload.update({
+        collection: arrayCollectionSlug,
+        locale: spanishLocale,
+        id: docID,
+        data: {
+          items: null,
+        },
+      });
+
+      // should return the value of the fallback locale
+      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+      // @ts-ignore
+      expect(updatedSpanishDoc.items[0].text).toStrictEqual(englishTitle);
+    });
+  });
 });
 
 async function createLocalizedPost(data: {