Extend invoices and invoice items to keep more information.

app/Models/Project.php

@@ -5,6 +5,7 @@ namespace App\Models;
 use Carbon\Carbon;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
 use Illuminate\Database\Eloquent\SoftDeletes;
 
 class Project extends Model
@@ -33,8 +34,20 @@ class Project extends Model
     protected $appends = [
         'start',
         'end',
+        'customer_email',
+        'customer_name',
     ];
 
+
+    public function getCustomerNameAttribute(): string
+    {
+        return $this->customer->name;
+    }
+    public function getCustomerEmailAttribute(): string
+    {
+        return $this->customer->email;
+    }
+
     /**
      * Get the end_date attribute in local format.
      */
@@ -58,4 +71,9 @@ class Project extends Model
     {
         return $this->belongsTo(Customer::class);
     }
+
+    public function invoices(): HasMany
+    {
+        return $this->hasMany(Invoice::class);
+    }
 }