feat: Get certificate by instructor

[thanglp163]

Summary by CodeRabbit

• New Features
  • Added an endpoint for instructors to retrieve certificates associated with their courses.
  • Results include learner and course details and are sorted by newest first.
  • Returns an empty list when no certificates are found.
  • Requires authentication and instructor role to access.
  • Provides clear responses for unauthorized access and server errors.

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

Adds a new instructor-only GET endpoint to list certificates for courses authored by the authenticated user. Implements controller logic to query courses by authorId, fetch related certificates with selected populations, sort by creation date, and handle auth, empty results, and errors. Updates routing to wire the endpoint with middlewares.

Changes

Cohort / File(s)	Summary
Instructor certificates endpoint src/routes/certificate.route.ts	Adds GET /instructor/courses route protected by isAuthenticated and authorizeRoles('instructor'), invoking getCertificatesByInstructor. Updates imports and adds a descriptive comment.
Controller for instructor certificates src/controllers/certificate.controller.ts	Adds getCertificatesByInstructor(req, res): validates req.user._id, queries Course by authorId, fetches and populates matching Certificate records, sorts by createdAt desc, returns results; handles 401 and 500 cases.

Sequence Diagram(s)

sequenceDiagram
  autonumber
  actor U as Instructor (Client)
  participant R as Router: /certificates
  participant A as isAuthenticated
  participant AR as authorizeRoles("instructor")
  participant C as certificate.controller.getCertificatesByInstructor
  participant M1 as Course Model
  participant M2 as Certificate Model

  U->>R: GET /instructor/courses
  R->>A: Verify session/JWT
  A-->>R: OK or 401
  alt Unauthenticated
    R-->>U: 401 Unauthorized
  else Authenticated
    R->>AR: Check role = instructor
    AR-->>R: OK or 403
    alt Not instructor
      R-->>U: 403 Forbidden
    else Instructor
      R->>C: getCertificatesByInstructor(req, res)
      C->>M1: find({ authorId: req.user._id }).select("_id")
      M1-->>C: courseIds
      alt No courses
        C-->>U: 200 []
      else Has courses
        C->>M2: find({ course: { $in: courseIds }})<br/>.populate(user, course)<br/>.sort(-createdAt)
        M2-->>C: certificates
        C-->>U: 200 certificates
      end
    end
  end

  rect rgba(200, 230, 255, 0.3)
    note right of C: New controller flow to aggregate certificates by instructor-owned courses
  end

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Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10–15 minutes

Possibly related PRs

• feat: api Certificate #47 — Adds certificate controllers/routes; overlaps with controller and routing areas touched here.
• Feature/task 46 #48 — Further certificate controller/route additions; likely adjacent to the new instructor-specific endpoint.

Poem

I thump my paws on verdant ground,
New routes hop in without a sound—
Instructor trails to certs now clear,
Courses gathered, proofs appear.
With tidy paws, I fetch and sort,
200s bloom—a happy report. 🐇✨

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📥 Commits

Reviewing files that changed from the base of the PR and between 4302341 and 66fef9a.

📒 Files selected for processing (2)

• src/controllers/certificate.controller.ts (1 hunks)
• src/routes/certificate.route.ts (2 hunks)

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