Implement Member Update Endpoint

[Allimonae]

Implement Member Update Endpoint

Summary

Add a PATCH /members/{id} endpoint to update member profiles with support for partial updates, comprehensive validation, and proper error handling.

Changes

• Controller: Implement updateMember endpoint with @Valid request validation
• Service: Add business logic for partial updates with:
  • Null-check pattern (null = skip update, empty string = valid update)
  • Email uniqueness validation before update
  • Validation exceptions for blank required fields
• DTO: Refactor UpdateMemberRequest to use Optional<String> fields to distinguish between "field not provided" (null) and "field provided as empty" (blank validation)
• Exception Handling: Add ValidationException and handler for service-level validation failures
• Tests: Comprehensive test coverage for both service and controller layers:
  • Service: null/empty field handling, email duplicate detection, validation edge cases
  • Controller: HTTP status codes (200, 400, 404, 409), response structure, exception integration

Design Notes

• Partial updates: Client can omit fields to leave them unchanged
• Required fields (firstName, lastName, email, introduction): Cannot be empty strings but can be omitted
• Email change validation: Only checks for duplicates when email is being updated to a new value
• All validation exceptions return 400 with descriptive error messages

Testing

• All service tests passing (partial updates, all nulls, full updates, email scenarios)
• All controller tests passing (happy path, validation, error scenarios)

Testing Null vs Blank

1. Created a new member

1. Test case 1 - all new fields

1. Test case 2 - all fields null (no updates)

1. Test case 3 - all fields blank

1. Test case 4 - required fields null, optional fields blank

[Allimonae]

• Implement getMemberById endpoint #76
• Implement Member Update Endpoint #73 👈 (View in Graphite)
• main

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[graphite-app]

Graphite Automations

"Request reviewers once CI passes" took an action on this PR • (08/10/26)

2 reviewers were added to this PR based on Henry Chen's automation.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud