goodgo-platform/docs/audits/README_INQUIRIES_EXPLORATION.md

📚 Inquiries Module - Complete Exploration Documentation

Generated: April 11, 2026
Module: apps/api/src/modules/inquiries/
Status: ✅ Complete & Thorough Analysis

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📖 DOCUMENTATION FILES

This exploration includes 3 comprehensive documentation files designed for different use cases:

1. INQUIRIES_MODULE_EXPLORATION.md (23 KB)

Purpose: In-depth reference guide
Best for: Understanding architecture, patterns, and complete file descriptions

Contains:

• 📁 Complete directory structure
• 📄 Full file listing with descriptions
• 🏗️ Module architecture diagrams
• 🔑 Key classes & handlers breakdown
• 🎯 DDD layer analysis
• 📊 Test file summary
• 🛠️ Dependencies & security
• 📝 API contracts

Read this when: You need complete understanding of the module

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2. INQUIRIES_MODULE_QUICK_REFERENCE.md (9.3 KB)

Purpose: Quick lookup guide
Best for: Getting up to speed quickly, finding specific information

Contains:

• 📊 Module at a glance
• 📁 Files by layer overview
• 🔄 Request flow diagrams
• 🔑 Key classes table
• 📝 Key interfaces
• 🧪 Test statistics
• 🔐 Authorization matrix
• 🎯 DDD principles
• 📌 Common patterns
• 🔍 Where to look for X guide

Read this when: You need quick answers or are new to the module

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3. INQUIRIES_COMPLETE_FILE_INDEX.md (23 KB)

Purpose: Exhaustive file reference
Best for: Finding specific files, understanding dependencies, planning modifications

Contains:

• 📋 Complete file listing by path
• 📊 File statistics tables
• 🔍 File discovery guide
• 🔗 Dependency graph
• 📝 File cross-references
• 🎯 Entry points for modifications
• Line count for each file
• Detailed method descriptions

Read this when: You need file-by-file details or planning changes

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🎯 QUICK START BY USE CASE

I want to understand the overall architecture

→ Start with Quick Reference → Dive into Exploration

I'm new to this module

→ Start with Quick Reference → Browse File Index as needed

I need to add a new endpoint

→ Check File Index → Entry Points section → Follow the guide

I need to understand a specific layer

→ Search Quick Reference for layer → Read full details in Exploration

I'm looking for a specific class or method

→ Use File Index → File Discovery Guide section

I need to understand data flow

→ Quick Reference → Request Flows section

I'm fixing a bug or refactoring

→ File Index → Dependency Graph & Cross-References

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📊 MODULE SNAPSHOT

Location:    apps/api/src/modules/inquiries/
Files:       25 total (19 source + 6 test files)
LOC:         1,212 lines of code
Pattern:     CQRS + DDD (Clean Architecture)
Tests:       24 test cases across 6 suites
Endpoints:   4 HTTP endpoints

Layer Breakdown

Layer	Files	Purpose
Presentation	5	HTTP endpoints + validation
Application	8	Commands/Queries + orchestration
Domain	6	Business logic + contracts
Infrastructure	1	Prisma persistence
Module	2	Configuration + exports

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🗂️ FILE TREE

inquiries/
├── 📄 index.ts                              [Barrel export]
├── 📄 inquiries.module.ts                   [NestJS Module]
│
├── 📁 presentation/
│   ├── controllers/
│   │   └── inquiries.controller.ts          [4 endpoints]
│   ├── dto/
│   │   ├── create-inquiry.dto.ts            [Input validation]
│   │   └── list-inquiries.dto.ts            [Pagination]
│   └── __tests__/
│       └── inquiries.controller.spec.ts     [6 tests]
│
├── 📁 application/
│   ├── commands/
│   │   ├── create-inquiry/
│   │   │   ├── create-inquiry.command.ts
│   │   │   └── create-inquiry.handler.ts
│   │   └── mark-inquiry-read/
│   │       ├── mark-inquiry-read.command.ts
│   │       └── mark-inquiry-read.handler.ts
│   ├── queries/
│   │   ├── get-inquiries-by-agent/
│   │   │   ├── get-inquiries-by-agent.query.ts
│   │   │   └── get-inquiries-by-agent.handler.ts
│   │   └── get-inquiries-by-listing/
│   │       ├── get-inquiries-by-listing.query.ts
│   │       └── get-inquiries-by-listing.handler.ts
│   └── __tests__/
│       ├── create-inquiry.handler.spec.ts
│       ├── mark-inquiry-read.handler.spec.ts
│       ├── get-inquiries-by-listing.handler.spec.ts
│       └── get-inquiries-by-agent.handler.spec.ts
│
├── 📁 domain/
│   ├── entities/
│   │   └── inquiry.entity.ts                [Aggregate Root]
│   ├── events/
│   │   ├── inquiry-created.event.ts
│   │   └── inquiry-read.event.ts
│   ├── repositories/
│   │   ├── inquiry.repository.ts            [Interface]
│   │   └── inquiry-read.dto.ts              [Read DTO]
│   └── __tests__/
│       └── inquiry-domain.spec.ts           [5 tests]
│
└── 📁 infrastructure/
    └── repositories/
        └── prisma-inquiry.repository.ts     [Implementation]

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🔄 REQUEST FLOWS

Create Inquiry

POST /inquiries
→ Controller validates JWT
→ CreateInquiryCommand dispatched
→ CreateInquiryHandler executes:
  • Validate listing exists
  • Create InquiryEntity
  • Save to repository
  • Publish InquiryCreatedEvent
→ Response: { id, listingId, createdAt }

Mark as Read

PATCH /inquiries/:id/read (AGENT only)
→ Controller validates JWT + AGENT role
→ MarkInquiryReadCommand dispatched
→ MarkInquiryReadHandler executes:
  • Load inquiry entity
  • Verify agent owns listing
  • Update entity state
  • Persist change
  • Publish InquiryReadEvent
→ Response: { success: true }

List Inquiries

GET /inquiries/listing/:id or /agent/me
→ Controller validates JWT (+ AGENT for /agent/me)
→ Query dispatched
→ Handler resolves pagination
→ Repository executes paginated query
→ Response: PaginatedResult<InquiryReadDto>

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🔑 KEY CONCEPTS

DDD (Domain-Driven Design)

• Domain Entity: InquiryEntity encapsulates inquiry logic
• Domain Events: InquiryCreatedEvent, InquiryReadEvent
• Repository Pattern: Interface in domain, implementation in infrastructure
• Aggregate Root: InquiryEntity manages state transitions

CQRS (Command Query Responsibility Segregation)

• Commands: CreateInquiryCommand, MarkInquiryReadCommand (write operations)
• Queries: GetInquiriesByListingQuery, GetInquiriesByAgentQuery (read operations)
• Handlers: Separate classes for each command/query

Clean Architecture Layers

1. Presentation: HTTP endpoints, DTOs, decorators
2. Application: Commands/Queries, handlers, coordination
3. Domain: Business logic, entities, events, interfaces
4. Infrastructure: Database, persistence implementation

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🧪 TEST COVERAGE

Total: 24 tests across 6 test suites

Test Suite	Tests	Focus
Domain Entity	5	Aggregate behavior, events
CreateInquiryHandler	4	Happy path, validation, events
MarkInquiryReadHandler	5	Happy path, auth, errors
GetInquiriesByListingHandler	2	Pagination, empty results
GetInquiriesByAgentHandler	2	Results, agent lookup
InquiriesController	6	All endpoints, defaults

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🔐 Security

Authentication: All endpoints require JWT token
Authorization: RBAC with AGENT role for certain endpoints

Endpoint Security Matrix

Endpoint	Auth	Role	Extra Checks
POST /inquiries	JWT	Any	Listing exists
GET /listing/:id	JWT	Any	-
GET /agent/me	JWT	AGENT	-
PATCH /:id/read	JWT	AGENT	Agent owns listing

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📡 API CONTRACTS

POST /inquiries

Request:  { listingId: string, message: string, phone?: string }
Response: { id: string, listingId: string, createdAt: string }
Status:   201 | 400 | 401 | 404

GET /inquiries/listing/:listingId

Query:    { page?: number, limit?: number }
Response: PaginatedResult<InquiryReadDto>
Status:   200 | 401

GET /inquiries/agent/me

Query:    { page?: number, limit?: number }
Response: PaginatedResult<InquiryReadDto>
Status:   200 | 401 | 403

PATCH /inquiries/:id/read

Response: { success: boolean }
Status:   200 | 401 | 403 | 404

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🚀 GETTING STARTED

For Understanding the Code

1. Read Quick Reference (5 min)
2. Review Request Flows (5 min)
3. Explore specific layers in Exploration as needed

For Adding Features

1. Check File Index → Entry Points (2 min)
2. Follow the modification guide (varies)
3. Check existing tests for patterns

For Debugging

1. Identify the layer (presentation/application/domain/infrastructure)
2. Find the file in File Index
3. Check tests for expected behavior

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📋 COMMON PATTERNS

Adding a Command

1. Create application/commands/[name]/[name].command.ts
2. Create application/commands/[name]/[name].handler.ts
3. Implement ICommandHandler<YourCommand>
4. Register in inquiries.module.ts CommandHandlers array
5. Add tests in application/__tests__/

Adding a Query

1. Create application/queries/[name]/[name].query.ts
2. Create application/queries/[name]/[name].handler.ts
3. Implement IQueryHandler<YourQuery>
4. Register in inquiries.module.ts QueryHandlers array
5. Add tests in application/__tests__/

Adding an Endpoint

1. Add method to InquiriesController
2. Add DTOs if needed to presentation/dto/
3. Dispatch command/query via bus
4. Add tests to presentation/__tests__/

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🔗 EXTERNAL DEPENDENCIES

Core:

• @nestjs/common - Framework
• @nestjs/cqrs - CQRS bus
• @prisma/client - ORM

Validation:

• class-validator - DTO validation
• class-transformer - Type transformation

Documentation:

• @nestjs/swagger - OpenAPI docs

Internal:

• @modules/shared - AggregateRoot, exceptions
• @modules/auth - JWT guards, decorators

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📈 QUALITY METRICS

Aspect	Rating	Notes
Architecture	⭐⭐⭐⭐⭐	Clean DDD + CQRS
Organization	⭐⭐⭐⭐⭐	Clear layer separation
Type Safety	⭐⭐⭐⭐⭐	Full TypeScript
Tests	⭐⭐⭐⭐☆	24 tests, good depth
Auth	⭐⭐⭐⭐⭐	Proper RBAC
Maintainability	⭐⭐⭐⭐⭐	Easy to extend

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💡 ARCHITECTURAL HIGHLIGHTS

✅ Separation of Concerns - Each layer has single responsibility
✅ Dependency Inversion - Depend on abstractions, not concrete implementations
✅ Event-Driven - Domain events for business significance
✅ CQRS - Read/write paths separate and optimizable
✅ Type Safety - Full TypeScript with no any types
✅ Testability - All layers independently testable
✅ Extensibility - Easy to add new commands/queries

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🎓 LEARNING PATH

Beginner: Read Quick Reference → Understand layers → Look at controller
Intermediate: Study handlers → Review entities → Examine tests
Advanced: Deep dive into event sourcing → Pagination → Optimization patterns

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📞 REFERENCE QUICK LINKS

Within documentation files:

Quick Reference:

• Files by layer
• Request flows
• Authorization matrix
• Entry points for changes

File Index:

• Complete file descriptions
• Dependency graph
• Cross-references
• Modification guide

Exploration:

• Architecture diagrams
• Design patterns
• Security details
• Test coverage analysis

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✨ Next Steps

1. Read the Quick Reference to get oriented
2. Pick a documentation file based on your need
3. Use the discovery guides to find specific information
4. Follow the modification guides when making changes
5. Check tests for expected behavior

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Happy exploring! 🚀

Generated: April 11, 2026
Documentation Status: ✅ Complete