From 1c2d27fecd3e68c8ab19a60464593ad7bd2449ea Mon Sep 17 00:00:00 2001
From: Rafal Dziegielewski <rafal.dzieg@gmail.com>
Date: Mon, 24 Jul 2023 09:14:41 +0200
Subject: [PATCH] feat: allow to translate resources in resource options

---
 src/adminjs.ts                                |  3 --
 .../resource/resource-options.interface.ts    |  7 ++++
 .../utils/build-feature/build-feature.ts      |  2 +-
 .../utils/options-parser/options-parser.ts    | 36 ++++++++++++++++++-
 4 files changed, 43 insertions(+), 5 deletions(-)

diff --git a/src/adminjs.ts b/src/adminjs.ts
index 247bc44c8..3d0350dab 100644
--- a/src/adminjs.ts
+++ b/src/adminjs.ts
@@ -115,9 +115,6 @@ class AdminJS {
 
     this.resolveBabelConfigPath()
 
-    // To be removed when Login page will be renedered on client side
-    this.locale = defaultLocale
-
     const { databases, resources } = this.options
 
     this.componentLoader = options.componentLoader ?? new ComponentLoader()
diff --git a/src/backend/decorators/resource/resource-options.interface.ts b/src/backend/decorators/resource/resource-options.interface.ts
index 076470085..b66e99889 100644
--- a/src/backend/decorators/resource/resource-options.interface.ts
+++ b/src/backend/decorators/resource/resource-options.interface.ts
@@ -7,6 +7,7 @@ import { CurrentAdmin } from '../../../current-admin.interface.js'
 import BaseResource from '../../adapters/resource/base-resource.js'
 import ViewHelpers from '../../utils/view-helpers/view-helpers.js'
 import { SearchActionResponse } from '../../actions/search/search-action.js'
+import { LocaleTranslationsBlock } from '../../../index.js'
 
 /**
  * @alias HrefContext
@@ -129,4 +130,10 @@ export interface ResourceOptions {
   } | {
     [key: string]: Partial<Action<ActionResponse>>;
   };
+  /**
+   * Resource-specific translations
+   */
+  translations?: {
+    [language: string]: LocaleTranslationsBlock;
+  }
 }
diff --git a/src/backend/utils/build-feature/build-feature.ts b/src/backend/utils/build-feature/build-feature.ts
index afd3a2e09..28e705c48 100644
--- a/src/backend/utils/build-feature/build-feature.ts
+++ b/src/backend/utils/build-feature/build-feature.ts
@@ -30,7 +30,7 @@ function mergeActionHooks<T>(
   return hooks.length ? { [key]: hooks } : {}
 }
 
-const basicOptions = ['id', 'href', 'parent', 'sort', 'navigation', 'titleProperty'] as const
+const basicOptions = ['id', 'href', 'parent', 'sort', 'navigation', 'titleProperty', 'translations'] as const
 const listOptions = [
   'listProperties', 'showProperties', 'editProperties', 'filterProperties',
 ] as const
diff --git a/src/backend/utils/options-parser/options-parser.ts b/src/backend/utils/options-parser/options-parser.ts
index e6d0971a7..0134d62f0 100644
--- a/src/backend/utils/options-parser/options-parser.ts
+++ b/src/backend/utils/options-parser/options-parser.ts
@@ -47,7 +47,41 @@ export const getLocales = async (admin: AdminJS, currentAdmin?: CurrentAdmin): P
   const { locale = {} } = admin.options || {}
   const computed = typeof locale === 'function' ? await locale(currentAdmin) : locale
 
-  return flat.unflatten(merge({}, flat.flatten(defaultLocale), flat.flatten(computed)))
+  let baseLocale: Locale = merge(
+    {} as Partial<Locale>,
+    flat.flatten(defaultLocale) as Locale,
+    flat.flatten(computed) as Locale,
+  )
+
+  if (!baseLocale.translations) {
+    baseLocale.translations = {}
+  }
+
+  // Merging translations defined in resource options
+  admin.resources.forEach((baseResource) => {
+    const decorated = baseResource._decorated ?? baseResource.decorate()
+
+    const { translations: resourceTranslations } = decorated.options
+
+    if (resourceTranslations) {
+      // Assure that translations object structure is consistent so we can use lodash#merge
+      const resourceLocale: Omit<Locale, 'language'> = {
+        translations: {},
+      }
+
+      Object.keys(resourceTranslations).forEach((language) => {
+        resourceLocale.translations![language] = {
+          resources: {
+            [decorated.id()]: resourceTranslations[language],
+          },
+        }
+      })
+
+      baseLocale = merge(baseLocale, resourceLocale)
+    }
+  })
+
+  return flat.unflatten(baseLocale)
 }
 
 export const getTheme = async (