Add POC for Field translation (#9898)

Similar to ObjectMetadata translation

Also fixed an issue linked to the migration from `t` to `message`
helper: we're forced to rebuild the ID ourselves

packages/twenty-server/src/engine/metadata-modules/field-metadata/field-metadata.resolver.ts

@@ -16,6 +16,7 @@ import { FieldMetadataType } from 'twenty-shared';
 
 import { FeatureFlagKey } from 'src/engine/core-modules/feature-flag/enums/feature-flag-key.enum';
 import { FeatureFlagService } from 'src/engine/core-modules/feature-flag/services/feature-flag.service';
+import { I18nContext } from 'src/engine/core-modules/i18n/types/i18n-context.type';
 import { Workspace } from 'src/engine/core-modules/workspace/workspace.entity';
 import { IDataloaders } from 'src/engine/dataloaders/dataloader.interface';
 import { AuthWorkspace } from 'src/engine/decorators/auth/auth-workspace.decorator';
@@ -43,6 +44,30 @@ export class FieldMetadataResolver {
     private readonly featureFlagService: FeatureFlagService,
   ) {}
 
+  @ResolveField(() => String, { nullable: true })
+  async label(
+    @Parent() fieldMetadata: FieldMetadataDTO,
+    @Context() context: I18nContext,
+  ): Promise<string> {
+    return this.fieldMetadataService.resolveTranslatableString(
+      fieldMetadata,
+      'label',
+      context.req.headers['x-locale'],
+    );
+  }
+
+  @ResolveField(() => String, { nullable: true })
+  async description(
+    @Parent() fieldMetadata: FieldMetadataDTO,
+    @Context() context: I18nContext,
+  ): Promise<string> {
+    return this.fieldMetadataService.resolveTranslatableString(
+      fieldMetadata,
+      'description',
+      context.req.headers['x-locale'],
+    );
+  }
+
   @Mutation(() => FieldMetadataDTO)
   async createOneField(
     @Args('input') input: CreateOneFieldMetadataInput,

packages/twenty-server/src/engine/metadata-modules/field-metadata/field-metadata.service.ts

@@ -1,6 +1,7 @@
 import { Injectable } from '@nestjs/common';
 import { InjectDataSource, InjectRepository } from '@nestjs/typeorm';
 
+import { i18n } from '@lingui/core';
 import { TypeOrmQueryService } from '@ptc-org/nestjs-query-typeorm';
 import isEmpty from 'lodash.isempty';
 import { FieldMetadataType } from 'twenty-shared';
@@ -8,6 +9,7 @@ import { DataSource, FindOneOptions, Repository } from 'typeorm';
 import { v4 as uuidV4, v4 } from 'uuid';
 
 import { TypeORMService } from 'src/database/typeorm/typeorm.service';
+import { generateMessageId } from 'src/engine/core-modules/i18n/utils/generateMessageId';
 import { DataSourceService } from 'src/engine/metadata-modules/data-source/data-source.service';
 import { compositeTypeDefinitions } from 'src/engine/metadata-modules/field-metadata/composite-types';
 import { CreateFieldInput } from 'src/engine/metadata-modules/field-metadata/dtos/create-field.input';
@@ -773,4 +775,29 @@ export class FieldMetadataService extends TypeOrmQueryService<FieldMetadataEntit
 
     return fieldMetadataInput;
   }
+
+  async resolveTranslatableString(
+    fieldMetadata: FieldMetadataDTO,
+    labelKey: 'label' | 'description',
+    locale: string | undefined,
+  ): Promise<string> {
+    if (fieldMetadata.isCustom) {
+      return fieldMetadata[labelKey] ?? '';
+    }
+
+    if (!locale) {
+      return fieldMetadata[labelKey] ?? '';
+    }
+
+    i18n.activate(locale);
+
+    const messageId = generateMessageId(fieldMetadata[labelKey] ?? '');
+    const translatedMessage = i18n._(messageId);
+
+    if (translatedMessage === messageId) {
+      return fieldMetadata[labelKey] ?? '';
+    }
+
+    return translatedMessage;
+  }
 }