chore: update document approval workflow and bug fixes

Modules/MaterialLogistics/app/Models/MaterialRequisition.php

@@ -0,0 +1,66 @@
+<?php
+
+namespace Modules\MaterialLogistics\Models;
+
+use App\Models\User;
+use App\Traits\HasPublicIdentifier;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\BelongsToMany;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+use Modules\ApprovalWorkflow\Traits\HasApprovable;
+use Modules\ProjectManagement\Models\Project;
+
+class MaterialRequisition extends Model
+{
+    use HasPublicIdentifier, HasApprovable;
+
+    protected $fillable = [
+        'document_number', 'status',
+        'requested_by', 'approved_by', 'approved_at', 'notes',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'approved_at' => 'datetime',
+        ];
+    }
+
+
+    public function requester(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'requested_by');
+    }
+
+    public function approver(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'approved_by');
+    }
+
+    public function items(): HasMany
+    {
+        return $this->hasMany(MaterialRequisitionItem::class);
+    }
+
+    public function purchaseOrders(): BelongsToMany
+    {
+        return $this->belongsToMany(PurchaseOrder::class, 'purchase_order_requisitions')
+            ->withTimestamps();
+    }
+
+    public function getTotalCostAttribute(): float
+    {
+        return $this->items->sum(fn (MaterialRequisitionItem $item) => $item->line_total);
+    }
+
+    public function scopeDraft($query)
+    {
+        return $query->where('status', 'draft');
+    }
+
+    public function scopeApproved($query)
+    {
+        return $query->where('status', 'approved');
+    }
+}