apps/users-application/src/users/models/user.model.ts (1)

5-11: Consider enhancing the User model with additional fields.

The current implementation with id and name fields is correct and follows GraphQL best practices. However, consider if additional fields might be needed for a complete user model:

• email (for user identification)
• createdAt/updatedAt (for tracking)
• status (for user state management)

Example enhancement:

 export class User {
   @Field(() => ID)
   id: number;

   @Field()
   name: string;
+
+  @Field()
+  email: string;
+
+  @Field(() => Date)
+  createdAt: Date;
+
+  @Field(() => Date)
+  updatedAt: Date;
+
+  @Field()
+  status: string;
 }

apps/users-application/src/users/users.resolver.ts (3)

6-8: Consider adding readonly modifier to the constructor parameter.

While the implementation is correct, adding the readonly modifier would better enforce immutability.

-  constructor(private usersService: UsersService) {}
+  constructor(private readonly usersService: UsersService) {}

---

15-21: Improve type safety for reference resolution.

1. Consider creating a dedicated interface for the reference parameter.
2. Handle null case explicitly for GraphQL compatibility.

+  interface Reference {
+    __typename: string;
+    id: number;
+  }
+
   @ResolveReference()
-  resolveReference(reference: {
-    __typename: string;
-    id: number;
-  }): User | undefined {
+  resolveReference(reference: Reference): User | null {
     return this.usersService.findById(reference.id);
   }

---

6-22: Consider additional federation configuration.

For a complete federation setup, consider:

1. Adding @Key decorator to the User model to specify the entity's primary key
2. Implementing __resolveType if this service will be resolving interfaces or unions
3. Adding health checks for federation gateway integration

apps/users-application/src/users/users.module.ts (2)

14-20: Consider adding federation-specific configurations.

For a more robust federation setup, consider adding these configurations:

 GraphQLModule.forRoot<ApolloFederationDriverConfig>({
   driver: ApolloFederationDriver,
   autoSchemaFile: 'apps/users-application/src/schema.gql',
+  playground: true,
+  context: ({ req }) => ({ req }),
+  buildSchemaOptions: {
+    orphanedTypes: [],
+  },
   plugins: [ApolloServerPluginInlineTrace()],
 }),

---

18-18: Consider environment-specific tracing configuration.

The inline trace plugin is enabled globally. Consider making it configurable based on the environment.

+ // TODO: Make tracing configurable based on environment
  plugins: [
-   ApolloServerPluginInlineTrace()
+   process.env.NODE_ENV === 'production'
+     ? ApolloServerPluginInlineTrace({
+         // Add production-specific options
+         generateClientInfo: ({ request }) => {
+           return {
+             clientName: request.headers['apollo-client-name'],
+             clientVersion: request.headers['apollo-client-version'],
+           };
+         },
+       })
+     : ApolloServerPluginInlineTrace()
  ],

apps/users-application/src/users/users.service.spec.ts (4)

1-3: Consider organizing imports by external/internal dependencies.

For better maintainability, consider grouping imports:

1. External dependencies (@nestjs)
2. Internal modules (services, models)

 import { Test, TestingModule } from '@nestjs/testing';
+
 import { UsersService } from './users.service';
 import { User } from './models/user.model';

---

5-14: Add explicit type annotation for better type safety.

The service variable declaration could benefit from explicit typing.

 describe('UsersService', () => {
-  let service: UsersService;
+  let service: UsersService | undefined;

---

16-18: Enhance service existence test with additional assertions.

While checking if the service is defined is good, consider adding assertions for the service's essential properties and methods.

 it('should be defined', () => {
   expect(service).toBeDefined();
+  expect(service.findById).toBeDefined();
+  expect(typeof service.findById).toBe('function');
 });

---

1-29: Consider architectural improvements for production readiness.

As this is part of a GraphQL federation setup, consider the following architectural improvements:

1. Mock any future database dependencies using NestJS's custom providers
2. Add tests for GraphQL-specific concerns (field resolvers, federation directives)
3. Consider adding integration tests for federation scenarios

Example implementation for database mocking:

const mockUsersRepository = {
  findOne: jest.fn(),
  // Add other repository methods
};

describe('UsersService', () => {
  beforeEach(async () => {
    const module: TestingModule = await Test.createTestingModule({
      providers: [
        UsersService,
        {
          provide: 'UsersRepository',
          useValue: mockUsersRepository,
        },
      ],
    }).compile();
    // ...
  });
  // ...
});

apps/users-application/src/users/users.resolver.spec.ts (2)

6-25: Consider expanding the mock implementation.

While the current mock covers findById, consider adding comprehensive mocking for all service methods, including error scenarios. This ensures complete test coverage and helps catch edge cases.

 useValue: {
   findById: jest.fn(),
+  // Add other service methods
+  create: jest.fn(),
+  update: jest.fn(),
+  delete: jest.fn(),
 },

---

27-29: Consider adding more initialization tests.

While testing resolver definition is good, consider adding tests to verify:

• Service injection
• Resolver configuration (if any)
• GraphQL field definitions

Configuration used: CodeRabbit UI
Review profile: CHILL

#!/bin/bash
# Description: Verify federation setup across the application
# Check for federation gateway configuration and other federated services

# Test 1: Check for federation gateway setup
echo "Checking for federation gateway configuration..."
rg -l "ApolloGateway|@apollo/gateway" --type ts

# Test 2: Check for other federated services
echo "Checking for other federated services..."
rg -l "@Directive\\('@key" --type ts

# Test 3: Verify federation module configuration
echo "Checking for federation module setup..."
rg "GraphQLFederationModule" --type ts -A 5

#!/bin/bash
# Let's verify the federation setup more thoroughly

# Check for GraphQL Module configuration in the application
echo "Checking GraphQL module configuration..."
rg "GraphQLModule.forRoot" -A 10 --type ts

# Check if the User model has the 'id' field referenced in @key directive
echo "Checking User model implementation..."
ast-grep --pattern 'class User {
  $$$
  id: $_
  $$$
}'

# Check for federation-related dependencies in package.json
echo "Checking federation dependencies..."
cat package.json | grep -A 5 -B 5 "@apollo/federation"

# Look for any federation configuration files
echo "Looking for federation config files..."
fd -e ts -e js -e json federation

#!/bin/bash
# Let's check the User model implementation directly and verify dependencies in package.json

# Check the complete User model implementation
echo "Checking complete User model..."
cat apps/users-application/src/users/models/user.model.ts

# Check package.json for all Apollo-related dependencies
echo "Checking Apollo dependencies..."
cat apps/users-application/src/package.json | jq '.dependencies'

#!/bin/bash
# Description: Verify the existence and location of UsersModule
# Expected: Find the users.module.ts file in the correct location

# Check if the file exists at the expected location
fd --type f "users.module.ts" apps/users-application/src/

# Verify the module exports
ast-grep --pattern 'export class UsersModule {}'

#!/bin/bash
# Description: Verify GraphQL federation setup in UsersModule
# Expected: Find federation-specific decorators and configurations

# Look for federation setup in UsersModule
rg -l "ApolloFederationDriver|buildFederatedSchema" apps/users-application/src/

# Check for @Key decorator usage in User entity
ast-grep --pattern '@Key($$$) class User'

#!/bin/bash
# Let's check the actual federation setup in the UsersModule
cat apps/users-application/src/users/users.module.ts

# Also check for any User entity definitions
fd User.ts -t f --exec cat {}

#!/bin/bash
# Let's check the resolver and any entity definitions
cat apps/users-application/src/users/users.resolver.ts

# Also check for any GraphQL schema definitions
fd ".graphql" -t f --exec cat {}

#!/bin/bash
# Let's check the User model definition
cat apps/users-application/src/users/models/user.model.ts

# Also check if there's a schema.gql file that might have been generated
fd "schema.gql" --exec cat {}

-  findById(id: number): User | undefined {
-    return this.users.find((user) => user.id === Number(id));
+  findById(id: number | string): User | undefined {
+    const numericId = typeof id === 'string' ? Number(id) : id;
+    if (isNaN(numericId)) {
+      throw new Error('Invalid user ID format');
+    }
+    const user = this.users.find((user) => user.id === numericId);
+    return user;
+  }

#!/bin/bash
# Check for federation configuration
echo "Checking federation configuration..."
rg --type typescript "extend type" apps/
rg --type typescript "@key|@external|@requires|@provides" apps/

#!/bin/bash
# Check for federation configuration with correct file extensions
echo "Checking federation configuration..."
# Look for federation-specific decorators and type extensions
rg -t ts "@Key|@External|@Requires|@Provides|extend type" apps/

# Look for federation module imports and setup
rg -t ts "@apollo/federation|buildFederatedSchema" apps/

# Check resolver implementation
cat apps/users-application/src/users/users.resolver.ts

#!/bin/bash
# Check user model for federation decorators
cat apps/users-application/src/users/models/user.model.ts

# Check GraphQL module setup
rg -t ts "GraphQLModule.forRoot" apps/

# Check main.ts for federation setup
cat apps/users-application/src/main.ts

#!/bin/bash
# Check users module configuration
cat apps/users-application/src/users/users.module.ts

# Check applications config for federation setup
rg -t ts "userSubGraph" -A 5 -B 5 libs/applications-config/