chore: update document approval workflow and bug fixes

Modules/ContractorManagement/app/Models/Contractor.php

@@ -0,0 +1,88 @@
+<?php
+
+namespace Modules\ContractorManagement\Models;
+
+use App\Traits\HasPublicIdentifier;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\Relations\BelongsToMany;
+use Modules\BiddingManagement\Models\BidInvitation;
+use Modules\ProjectManagement\Models\Project;
+
+class Contractor extends Model
+{
+    use HasPublicIdentifier;
+
+    protected $fillable = [
+        'company_name', 'contact_person', 'email', 'phone',
+        'specialization', 'address', 'tax_id',
+        'payment_terms', 'rating', 'status',
+        'type', 'parent_id', 'user_limit',
+        'shares_materials_catalog',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'rating' => 'decimal:1',
+            'user_limit' => 'integer',
+            'shares_materials_catalog' => 'boolean',
+        ];
+    }
+
+    public function equipment(): HasMany
+    {
+        return $this->hasMany(ContractorEquipment::class);
+    }
+
+    public function users(): HasMany
+    {
+        return $this->hasMany(\App\Models\User::class);
+    }
+
+    public function parent()
+    {
+        return $this->belongsTo(self::class, 'parent_id');
+    }
+
+    public function children(): HasMany
+    {
+        return $this->hasMany(self::class, 'parent_id');
+    }
+
+    public function certifications(): HasMany
+    {
+        return $this->hasMany(ContractorCertification::class);
+    }
+
+    public function bidInvitations(): HasMany
+    {
+        return $this->hasMany(BidInvitation::class);
+    }
+
+    public function invoices(): HasMany
+    {
+        return $this->hasMany(ContractorInvoice::class);
+    }
+
+    public function projects(): BelongsToMany
+    {
+        return $this->belongsToMany(Project::class, 'project_contractor')
+            ->withPivot('role', 'contract_amount')
+            ->withTimestamps();
+    }
+
+    public function getActiveCertificationsCountAttribute(): int
+    {
+        return $this->certifications()->where('status', 'active')->count();
+    }
+
+    public function getExpiringCertificationsCountAttribute(): int
+    {
+        return $this->certifications()
+            ->where('status', 'active')
+            ->where('expiry_date', '<=', now()->addDays(30))
+            ->where('expiry_date', '>', now())
+            ->count();
+    }
+}