chore: update document approval workflow and bug fixes

Modules/MaterialLogistics/app/Models/MaterialRequirement.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace Modules\MaterialLogistics\Models;
+use Modules\MasterData\Models\Material;
+use Modules\MasterData\Models\MaterialGroup;
+
+use App\Traits\HasPublicIdentifier;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Modules\ProjectManagement\Models\Project;
+
+class MaterialRequirement extends Model
+{
+    use HasPublicIdentifier;
+
+    protected $fillable = [
+        'project_id', 'task_id', 'material_id',
+        'required_qty', 'unit_cost_at_booking', 'status',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'required_qty' => 'decimal:2',
+            'unit_cost_at_booking' => 'decimal:2',
+        ];
+    }
+
+    public function project(): BelongsTo
+    {
+        return $this->belongsTo(Project::class);
+    }
+
+    public function material(): BelongsTo
+    {
+        return $this->belongsTo(Material::class);
+    }
+
+    public function getTotalCostAttribute(): float
+    {
+        return (float) $this->required_qty * (float) $this->unit_cost_at_booking;
+    }
+}
+