40227-vm/backend/docs/class_enrollments.md

Class Enrollments Backend

Purpose

class_enrollments is the per-organization join between students and classes — it records a student's enrollment in a class with its own dates and status. It is a generic-CRUD slice assembled from the shared factories; the backend is the source of truth for enrollment records.

Slice Files (by layer)

• Route: src/routes/class_enrollments.ts — createCrudRouter(controller, { permission: 'class_enrollments' }).
• Controller: src/api/controllers/class_enrollments.controller.ts — createCrudController(service, { csvFields }).
• Service (BLL): src/services/class_enrollments.ts — createCrudService(DbApi, { notFoundCode: 'class_enrollmentsNotFound' }).
• Repository (DAL): src/db/api/class_enrollments.ts (Class_enrollmentsDBApi) — entity-specific create/bulkImport/update/findBy/findAll; remove/deleteByIds/findAllAutocomplete delegate to db/api/shared/repository.ts.
• Model: src/db/models/class_enrollments.ts.
• Shared used: CRUD factories (services/shared/crud-service.ts, api/controllers/shared/crud-controller.ts, api/http/crud-router.ts), repository helpers (db/api/shared/repository.ts), shared/constants/pagination.ts (resolvePagination), shared/constants/database.ts (BULK_IMPORT_TIMESTAMP_STEP_MS), db/utils.ts (Utils).

API

The standard generic-CRUD surface (all under /api/class_enrollments, JWT + ${METHOD}_CLASS_ENROLLMENTS permission, all 200) — see backend-architecture.md for the shared contract:

• POST / — body { data }, returns true.
• POST /bulk-import — multipart CSV file, returns true.
• PUT /:id — body { data, id } (the service reads the id from the body), returns true.
• DELETE /:id — returns true.
• POST /deleteByIds — body { data: string[] }, returns true.
• GET / — query filters, returns { rows, count }; ?filetype=csv streams a CSV of csvFields.
• GET /count — returns { rows: [], count }.
• GET /autocomplete — ?query&limit&offset, returns [{ id, label }] where label is status (the field passed to autocompleteByField).
• GET /:id — returns the record with eager associations (see Data Contract).

csvFields: id, enrolled_on, ended_on.

Access Rules

• JWT required; the whole router is guarded by checkCrudPermissions('class_enrollments'), deriving READ_CLASS_ENROLLMENTS / CREATE_CLASS_ENROLLMENTS / UPDATE_CLASS_ENROLLMENTS / DELETE_CLASS_ENROLLMENTS per HTTP method.
• Access is granted by role permission or per-user custom_permissions (see permissions.md).

Tenant Scope

• findAll scopes where.organizationId to currentUser.organizationId; a globalAccess role clears the org filter (sees all tenants).
• create assigns the organization from currentUser.organizationId; update only reassigns organization for globalAccess users (otherwise it stays the caller's org).

Data Contract

Model columns (paranoid, soft-delete via deletedAt):

• id (UUID PK).
• enrolled_on, ended_on — DATE, nullable.
• status — ENUM active | dropped | completed.
• importHash (unique), organizationId, classId, studentId, createdById, updatedById, timestamps.

Associations: belongsTo organization, class (classes), student (students), createdBy/updatedBy (users). This model declares no hasMany. findBy/GET /:id eager-load organization, class and student in a single Promise.all (the class association is exposed on the output as class).

List filters (ClassEnrollmentsFilter): id, class (id or name, |-separated), student (id or student_number, |-separated), enrolled_onRange, ended_onRange, status, organization, createdAtRange, plus field/sort ordering and limit/page pagination.

Behavior / Notes

• create/update wire the organization, class and student relations via the set* association mixins; bulkImport does not set these relations.
• bulkImport offsets createdAt per row by BULK_IMPORT_TIMESTAMP_STEP_MS to preserve order.
• List pagination uses the shared resolvePagination defaults (page size 10, capped at 100).
• Note: ClassEnrollmentsFilter accepts an active flag the model has no column for; it is currently inert (kept for source accuracy).

Tests

None yet.

Related

• Generic-CRUD contract: backend-architecture.md; related slices: students, classes, permissions.md.