feat: ✨ Initial graphql federation: users application #14
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Actionable comments posted: 8
🧹 Outside diff range and nitpick comments (12)
apps/users-application/src/users/models/user.model.ts (1)
5-11: Consider enhancing the User model with additional fields.The current implementation with
idandnamefields 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.
- Consider creating a dedicated interface for the reference parameter.
- 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:
- Adding
@Keydecorator to the User model to specify the entity's primary key- Implementing
__resolveTypeif this service will be resolving interfaces or unions- 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:
- External dependencies (@nestjs)
- 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:
- Mock any future database dependencies using NestJS's custom providers
- Add tests for GraphQL-specific concerns (field resolvers, federation directives)
- 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
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⛔ Files ignored due to path filters (1)
pnpm-lock.yamlis excluded by!**/pnpm-lock.yaml
📒 Files selected for processing (9)
.vscode/settings.json(1 hunks)apps/users-application/src/app/app.module.ts(1 hunks)apps/users-application/src/users/models/user.model.ts(1 hunks)apps/users-application/src/users/users.module.ts(1 hunks)apps/users-application/src/users/users.resolver.spec.ts(1 hunks)apps/users-application/src/users/users.resolver.ts(1 hunks)apps/users-application/src/users/users.service.spec.ts(1 hunks)apps/users-application/src/users/users.service.ts(1 hunks)package.json(2 hunks)
✅ Files skipped from review due to trivial changes (1)
- .vscode/settings.json
🔇 Additional comments (14)
apps/users-application/src/users/models/user.model.ts (2)
1-1: LGTM! Imports are correctly specified.
All necessary GraphQL decorators are imported from @nestjs/graphql.
3-4: Federation setup looks good, but verify the complete implementation.
The federation key directive is correctly configured using the id field. This is essential for entity resolution across the federated graph.
Let's verify the complete federation setup:
✅ Verification successful
Federation setup is correctly implemented
The verification confirms that:
- The User model correctly defines the
idfield that matches the@keydirective - The federation driver is properly configured in the users module using
ApolloFederationDriver - The User model is properly decorated for federation with both
@ObjectType()and@Directive('@key(fields: "id")')
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/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
Length of output: 475
Script:
#!/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
Length of output: 1205
Script:
#!/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'
Length of output: 540
apps/users-application/src/app/app.module.ts (2)
5-5: Verify the relative import path.
The import path ../users/users.module suggests the users module is at the same level as the app directory. Let's verify this structure is correct.
✅ Verification successful
Import path '../users/users.module' is correctly structured
The verification confirms that:
- The file exists at
apps/users-application/src/users/users.module.ts - The relative import path
../users/users.modulefromapps/users-application/src/app/app.module.tscorrectly points to this location
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/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 {}'
Length of output: 157
8-8: LGTM! Verify GraphQL federation setup.
The UsersModule is correctly imported and added to the module's imports array. However, let's verify that the UsersModule is properly configured for GraphQL federation.
✅ Verification successful
GraphQL federation is properly configured ✅
The federation setup is correctly implemented with:
- ApolloFederationDriver configured in UsersModule
- User model decorated with
@Directive('@key(fields: "id")') - ResolveReference implementation in UsersResolver for federation lookups
- Appropriate GraphQL decorators and types used throughout
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/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'
Length of output: 174
Script:
#!/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 {}
Length of output: 746
Script:
#!/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 {}
Length of output: 686
Script:
#!/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 {}
Length of output: 289
apps/users-application/src/users/users.service.ts (3)
1-2: LGTM!
The imports are correctly defined and necessary for the service implementation.
11-13: 🛠️ Refactor suggestion
Enhance error handling and type safety.
The current implementation has potential issues:
- No validation for invalid number conversions
- No explicit error handling for non-existent users
Consider implementing this improved version:
- 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;
+ }This change:
- Handles both number and string inputs (common in GraphQL)
- Validates numeric conversion
- Makes the code more defensive and explicit
Let's check how this method is used in resolvers:
4-9: Consider externalizing user data management.
While hardcoded data is acceptable for initial testing, consider implementing a more maintainable solution:
- Move user data to a configuration file or environment variables for easier updates
- Implement a proper database integration for production use
- Add data validation for user properties
This is particularly important in a federation setup where the Users service will be a source of truth for user data.
Let's check if there are any database configurations already in place:
apps/users-application/src/users/users.resolver.ts (1)
1-4: LGTM! Imports are well-organized and complete.
All necessary GraphQL federation decorators and dependencies are properly imported.
apps/users-application/src/users/users.module.ts (2)
1-10: LGTM! All necessary imports for federation are present.
The imports are well-organized and include all required dependencies for GraphQL federation setup.
11-13: LGTM! Module structure follows NestJS best practices.
The providers array correctly includes both UsersResolver and UsersService.
package.json (2)
19-20: LGTM! NestJS core packages are properly aligned.
All NestJS packages are on the same version (10.4.7), which is good for compatibility.
Also applies to: 22-22
23-23: LGTM! Utility packages are up to date.
The updated versions of axios, reflect-metadata, and rxjs are compatible with the new NestJS version.
Also applies to: 27-28
apps/users-application/src/users/users.resolver.spec.ts (2)
1-5: LGTM! Imports are well-organized.
The imports are clean, complete, and follow standard conventions.
1-64: Verify federation setup configuration.
Since this is part of a GraphQL federation implementation, ensure that:
- Federation directives are properly configured
- Reference resolution aligns with federation specifications
- Service is properly registered in the federation gateway
✅ Verification successful
Federation setup is properly configured
The federation implementation is correctly set up with all required components:
- User model is properly decorated with
@Directive('@key(fields: "id")')for federation resolveReferencemethod is correctly implemented in the resolver- Federation driver is configured in the module with
ApolloFederationDriver - Apollo tracing plugin is enabled for federation debugging
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Check for federation configuration
echo "Checking federation configuration..."
rg --type typescript "extend type" apps/
rg --type typescript "@key|@external|@requires|@provides" apps/
Length of output: 261
Script:
#!/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
Length of output: 859
Script:
#!/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
Length of output: 1006
Script:
#!/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/
Length of output: 838
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Related #8
Summary by CodeRabbit
Release Notes
New Features
UsersModule,UsersService, andUsersResolver.Bug Fixes
Tests
UsersServiceandUsersResolverto ensure proper functionality and error handling.Chores