refactor: using injection by token

src/modules/user/commands/create-user/create-user.service.ts

@@ -11,12 +11,12 @@ import {
   InternalServerErrorException,
 } from '@libs/exceptions';
 import { Inject } from '@nestjs/common';
-import { UserRepository } from '@modules/user/database/user.repository';
+import { USER_REPOSITORY } from '../../user.di-tokens';
 
 @CommandHandler(CreateUserCommand)
 export class CreateUserService implements ICommandHandler {
   constructor(
-    @Inject(UserRepository)
+    @Inject(USER_REPOSITORY)
     protected readonly userRepo: UserRepositoryPort,
   ) {}
 

src/modules/user/commands/delete-user/delete-user.service.ts

@@ -3,7 +3,7 @@ import { UserRepositoryPort } from '@modules/user/database/user.repository.port'
 import { Inject } from '@nestjs/common';
 import { CommandHandler } from '@nestjs/cqrs';
 import { Err, Ok, Result } from 'oxide.ts';
-import { UserRepository } from '../../database/user.repository';
+import { USER_REPOSITORY } from '../../user.di-tokens';
 
 export class DeleteUserCommand {
   readonly userId: string;
@@ -16,7 +16,7 @@ export class DeleteUserCommand {
 @CommandHandler(DeleteUserCommand)
 export class DeleteUserService {
   constructor(
-    @Inject(UserRepository)
+    @Inject(USER_REPOSITORY)
     private readonly userRepo: UserRepositoryPort,
   ) {}
 

src/modules/user/queries/find-users/find-users.query-handler.ts

@@ -2,7 +2,7 @@ import { IQueryHandler, QueryHandler } from '@nestjs/cqrs';
 import { Ok, Result } from 'oxide.ts';
 import { Inject } from '@nestjs/common';
 import { UserRepositoryPort } from '../../database/user.repository.port';
-import { UserRepository } from '../../database/user.repository';
+import { USER_REPOSITORY } from '../../user.di-tokens';
 import { UserEntity } from '@modules/user/domain/user.entity';
 import { PaginatedParams, PaginatedQueryBase } from '@libs/ddd/query.base';
 import { Paginated } from '@src/libs/ddd';
@@ -25,7 +25,7 @@ export class FindUsersQuery extends PaginatedQueryBase {
 @QueryHandler(FindUsersQuery)
 export class FindUsersQueryHandler implements IQueryHandler {
   constructor(
-    @Inject(UserRepository)
+    @Inject(USER_REPOSITORY)
     private readonly userRepo: UserRepositoryPort,
   ) {}
 

src/modules/user/user.di-tokens.ts

@@ -0,0 +1,3 @@
+// Tokens used for Dependency Injection
+
+export const USER_REPOSITORY = Symbol('USER_REPOSITORY');

src/modules/user/user.module.ts

@@ -1,4 +1,4 @@
-import { Logger, Module } from '@nestjs/common';
+import { Logger, Module, Provider } from '@nestjs/common';
 import { UserRepository } from './database/user.repository';
 import { CreateUserHttpController } from './commands/create-user/create-user.http.controller';
 import { DeleteUserHttpController } from './commands/delete-user/delete-user.http-controller';
@@ -11,6 +11,7 @@ import { DeleteUserService } from './commands/delete-user/delete-user.service';
 import { FindUsersQueryHandler } from './queries/find-users/find-users.query-handler';
 import { UserMapper } from './user.mapper';
 import { CqrsModule } from '@nestjs/cqrs';
+import { USER_REPOSITORY } from './user.di-tokens';
 
 const httpControllers = [
   CreateUserHttpController,
@@ -20,17 +21,19 @@ const httpControllers = [
 
 const messageControllers = [CreateUserMessageController];
 
-const cliControllers = [CreateUserCliController];
+const cliControllers: Provider[] = [CreateUserCliController];
 
-const graphqlResolvers = [CreateUserGraphqlResolver];
+const graphqlResolvers: Provider[] = [CreateUserGraphqlResolver];
 
-const repositories = [UserRepository];
+const commandHandlers: Provider[] = [CreateUserService, DeleteUserService];
 
-const commandHandlers = [CreateUserService, DeleteUserService];
+const queryHandlers: Provider[] = [FindUsersQueryHandler];
 
-const queryHandlers = [FindUsersQueryHandler];
+const mappers: Provider[] = [UserMapper];
 
-const mappers = [UserMapper];
+const repositories: Provider[] = [
+  { provide: USER_REPOSITORY, useClass: UserRepository },
+];
 
 @Module({
   imports: [CqrsModule],

src/modules/wallet/application/event-handlers/create-wallet-when-user-is-created.domain-event-handler.ts

@@ -3,12 +3,12 @@ import { WalletRepositoryPort } from '@modules/wallet/database/wallet.repository
 import { WalletEntity } from '../../domain/wallet.entity';
 import { OnEvent } from '@nestjs/event-emitter';
 import { Inject, Injectable } from '@nestjs/common';
-import { WalletRepository } from '@modules/wallet/database/wallet.repository';
+import { WALLET_REPOSITORY } from '../../wallet.di-tokens';
 
 @Injectable()
 export class CreateWalletWhenUserIsCreatedDomainEventHandler {
   constructor(
-    @Inject(WalletRepository)
+    @Inject(WALLET_REPOSITORY)
     private readonly walletRepo: WalletRepositoryPort,
   ) {}
 

src/modules/wallet/wallet.di-tokens.ts

@@ -0,0 +1 @@
+export const WALLET_REPOSITORY = Symbol('WALLET_REPOSITORY');

src/modules/wallet/wallet.module.ts

@@ -1,16 +1,22 @@
-import { Logger, Module } from '@nestjs/common';
+import { Logger, Module, Provider } from '@nestjs/common';
 import { CreateWalletWhenUserIsCreatedDomainEventHandler } from './application/event-handlers/create-wallet-when-user-is-created.domain-event-handler';
 import { WalletRepository } from './database/wallet.repository';
+import { WALLET_REPOSITORY } from './wallet.di-tokens';
 import { WalletMapper } from './wallet.mapper';
 
+const eventHandlers: Provider[] = [
+  CreateWalletWhenUserIsCreatedDomainEventHandler,
+];
+
+const mappers: Provider[] = [WalletMapper];
+
+const repositories: Provider[] = [
+  { provide: WALLET_REPOSITORY, useClass: WalletRepository },
+];
+
 @Module({
   imports: [],
   controllers: [],
-  providers: [
-    CreateWalletWhenUserIsCreatedDomainEventHandler,
-    WalletRepository,
-    WalletMapper,
-    Logger,
-  ],
+  providers: [Logger, ...eventHandlers, ...mappers, ...repositories],
 })
 export class WalletModule {}