Class Subjects Backend

Purpose

class_subjects is the per-organization join between classes and subjects — it represents a subject taught in a class, optionally assigned to a teacher (staff). It is a generic-CRUD slice assembled from the shared factories; the backend is the source of truth for these assignments.

Slice Files (by layer)

Route: src/routes/class_subjects.ts — createCrudRouter(controller, { permission: 'class_subjects' }).
Controller: src/api/controllers/class_subjects.controller.ts — createCrudController(service, { csvFields }).
Service (BLL): src/services/class_subjects.ts — createCrudService(DbApi, { notFoundCode: 'class_subjectsNotFound' }).
Repository (DAL): src/db/api/class_subjects.ts (Class_subjectsDBApi) — entity-specific create/bulkImport/update/findBy/findAll; remove/deleteByIds/findAllAutocomplete delegate to db/api/shared/repository.ts.
Model: src/db/models/class_subjects.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_subjects, JWT + ${METHOD}_CLASS_SUBJECTS 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.

Access Rules

JWT required; the whole router is guarded by checkCrudPermissions('class_subjects'), deriving READ_CLASS_SUBJECTS / CREATE_CLASS_SUBJECTS / UPDATE_CLASS_SUBJECTS / DELETE_CLASS_SUBJECTS 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).
status — ENUM active | archived.
importHash (unique), organizationId, classId, subjectId, teacherId, createdById, updatedById, timestamps.

Associations: belongsTo organization, class (classes), subject (subjects), teacher (staff), createdBy/updatedBy (users); hasMany timetable_periods_class_subject, attendance_sessions_class_subject, assessments_class_subject. findBy/GET /:id eager-load timetable_periods_class_subject, attendance_sessions_class_subject, assessments_class_subject, organization, class, subject and teacher in a single Promise.all (the class association is exposed on the output as class).

List filters (ClassSubjectsFilter): id, class (id or name, |-separated), subject (id or name, |-separated), teacher (id or employee_number, |-separated), status, organization, createdAtRange, plus field/sort ordering and limit/page pagination.

Behavior / Notes

create/update wire the organization, class, subject and teacher 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: ClassSubjectsFilter accepts an active flag the model has no column for; it is currently inert (kept for source accuracy).
Note: only id is in csvFields, so the CSV export emits just the id column.

Tests

None yet.

Generic-CRUD contract: backend-architecture.md; related slices: classes, subjects, staff, timetable_periods, attendance_sessions, assessments, permissions.md.

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