init backend presensi

app/Modules/Academic/Models/TeacherSubjectModel.php

@@ -0,0 +1,56 @@
+<?php
+
+namespace App\Modules\Academic\Models;
+
+use CodeIgniter\Model;
+
+class TeacherSubjectModel extends Model
+{
+    protected $table            = 'teacher_subjects';
+    protected $primaryKey       = 'id';
+    protected $useAutoIncrement = true;
+    protected $returnType       = 'array';
+    protected $useSoftDeletes   = false;
+    protected $protectFields    = true;
+    protected $allowedFields    = [
+        'teacher_user_id',
+        'subject_id',
+    ];
+
+    protected $useTimestamps = true;
+    protected $createdField  = 'created_at';
+    protected $updatedField  = 'updated_at';
+
+    /**
+     * Get subject IDs for a teacher.
+     *
+     * @param int $teacherId
+     * @return array<int>
+     */
+    public function getSubjectIdsForTeacher(int $teacherId): array
+    {
+        $rows = $this->select('subject_id')
+            ->where('teacher_user_id', $teacherId)
+            ->findAll();
+
+        return array_map(static fn ($row) => (int) $row['subject_id'], $rows);
+    }
+
+    /**
+     * Get mapping: subject_id => [teacher_user_id, ...].
+     *
+     * @return array<int, array<int>>
+     */
+    public function getMapSubjectToTeacherIds(): array
+    {
+        $rows = $this->select('teacher_user_id, subject_id')->findAll();
+        $map  = [];
+        foreach ($rows as $r) {
+            $s = (int) $r['subject_id'];
+            $t = (int) $r['teacher_user_id'];
+            $map[$s][] = $t;
+        }
+        return $map;
+    }
+}
+