reconstruction of the project

app/Models/SubjectCurriculum.php

@@ -2,11 +2,14 @@
 
 namespace App\Models;
 
-use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Builder;
+use App\Models\BaseModel;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
 
-class SubjectCurriculum extends Model
+class SubjectCurriculum extends BaseModel
 {
     protected $table = 'subject_curriculum_items';
+
     protected $fillable = [
         'class_id',
         'subject',
@@ -16,12 +19,126 @@ class SubjectCurriculum extends Model
         'created_at',
         'updated_at',
     ];
+
     public $timestamps = true;
 
-       /**
-        * TODO: Manual port review required for custom CI query methods from SubjectCurriculum.
-* - getOptionsForClass()
-        *
-        * This automated conversion preserves schema metadata only.
-        */
-}
+    protected $casts = [
+        'class_id'     => 'integer',
+        'unit_number'  => 'integer',
+        'created_at'   => 'datetime',
+        'updated_at'   => 'datetime',
+    ];
+
+    /* ============================================================
+     * Relationships (optional)
+     * ============================================================
+     */
+
+    public function class(): BelongsTo
+    {
+        // Rename SchoolClass/ClassModel to match your project
+        return $this->belongsTo(SchoolClass::class, 'class_id');
+    }
+
+    /* ============================================================
+     * Scopes
+     * ============================================================
+     */
+
+    public function scopeForClass(Builder $q, int $classId): Builder
+    {
+        return $q->where('class_id', $classId);
+    }
+
+    public function scopeForSubject(Builder $q, string $subject): Builder
+    {
+        return $q->where('subject', $subject);
+    }
+
+    public function scopeOrdered(Builder $q): Builder
+    {
+        return $q->orderBy('unit_number', 'asc')
+                 ->orderBy('chapter_name', 'asc');
+    }
+
+    /* ============================================================
+     * CI-compatible method
+     * ============================================================
+     */
+
+    /**
+     * CI: getOptionsForClass($classId, $subject)
+     */
+    public static function getOptionsForClass(int $classId, string $subject): array
+    {
+        return static::query()
+            ->forClass($classId)
+            ->forSubject($subject)
+            ->ordered()
+            ->get()
+            ->all();
+    }
+
+    /* ============================================================
+     * Enhancements for dropdowns (optional)
+     * ============================================================
+     */
+
+    /**
+     * Distinct unit options for dropdowns:
+     * returns array of [unit_number, unit_title]
+     */
+    public static function unitOptions(int $classId, string $subject): array
+    {
+        return static::query()
+            ->forClass($classId)
+            ->forSubject($subject)
+            ->select('unit_number', 'unit_title')
+            ->whereNotNull('unit_number')
+            ->orderBy('unit_number', 'asc')
+            ->distinct()
+            ->get()
+            ->map(fn ($r) => [
+                'unit_number' => (int) $r->unit_number,
+                'unit_title'  => (string) ($r->unit_title ?? ''),
+            ])
+            ->all();
+    }
+
+    /**
+     * Distinct chapter names for a unit (useful for 2nd dropdown).
+     */
+    public static function chapterOptions(int $classId, string $subject, int $unitNumber): array
+    {
+        return static::query()
+            ->forClass($classId)
+            ->forSubject($subject)
+            ->where('unit_number', $unitNumber)
+            ->select('chapter_name')
+            ->whereNotNull('chapter_name')
+            ->orderBy('chapter_name', 'asc')
+            ->distinct()
+            ->pluck('chapter_name')
+            ->filter(fn ($v) => $v !== null && trim((string)$v) !== '')
+            ->values()
+            ->all();
+    }
+
+    /* ============================================================
+     * Optional validation helper
+     * ============================================================
+     */
+
+    public static function rules(bool $updating = false): array
+    {
+        $req = $updating ? 'sometimes' : 'required';
+
+        return [
+            'class_id'      => [$req, 'integer', 'min:1'],
+            'subject'       => [$req, 'string', 'max:120'],
+            'unit_number'   => ['nullable', 'integer', 'min:0'],
+            'unit_title'    => ['nullable', 'string', 'max:255'],
+            'chapter_name'  => ['nullable', 'string', 'max:255'],
+        ];
+    }
+}