chore: update document approval workflow and bug fixes

Modules/MasterData/app/Models/MaterialGroup.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace Modules\MasterData\Models;
+
+use App\Traits\HasPublicIdentifier;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsToMany;
+use Modules\ProjectManagement\Models\Project;
+
+class MaterialGroup extends Model
+{
+    use HasPublicIdentifier;
+
+    protected $fillable = ['name', 'description', 'status'];
+
+    public function materials(): BelongsToMany
+    {
+        return $this->belongsToMany(Material::class, 'material_group_items')
+            ->withTimestamps();
+    }
+
+    public function projects(): BelongsToMany
+    {
+        return $this->belongsToMany(Project::class, 'project_material_groups')
+            ->withTimestamps();
+    }
+
+    public function scopeActive($query)
+    {
+        return $query->where('status', 'active');
+    }
+}