Apply changes when creating invoices for projects.

app/Http/Controllers/Api/InvoiceController.php

@@ -43,9 +43,9 @@ class InvoiceController extends Controller
             'address_id' => 'required|integer|exists:addresses,id',
             'delivery_id' => 'nullable|integer|exists:addresses,id',
             'project_id' => 'nullable|integer|exists:projects,id',
+            'project_count' => 'nullable|integer',
             'currency_code' => 'required|string',
             'type' => [Rule::enum(InvoiceTypeCode::class)],
-            'project_count' => 'nullable|integer',
             'tax' => 'required|numeric',
             'sum' => 'required|numeric',
             'due_date' => 'required|date',
@@ -73,6 +73,7 @@ class InvoiceController extends Controller
             'address_id' => 'required|integer|exists:addresses,id',
             'delivery_id' => 'nullable|integer|exists:addresses,id',
             'project_id' => 'nullable|integer|exists:projects,id',
+            'project_count' => 'nullable|integer',
             'currency_code' => 'required|string',
             'type' => [Rule::enum(InvoiceTypeCode::class)],
             'tax' => 'required|numeric',

app/Models/Invoice.php

@@ -43,25 +43,6 @@ class Invoice extends Model
         'localized_state'
     ];
 
-    /**
-     * Set the project_count variable automatically, if a project is related to this invoice.
-     */
-    public static function boot(): void
-    {
-        parent::boot();
-        self::creating(function (Invoice $invoice) {
-            if (is_null($invoice->project_id)) {
-                return true;
-            }
-            if ($invoice->type != '326') {
-                return true;
-            }
-            $projectMax = Invoice::where('project_id', '=', $invoice->project_id)->max('project_count') + 1;
-            $invoice->project_count = $projectMax;
-            return true;
-        });
-    }
-
     /**
      * Get the invoice state as translated string.
      */

app/Models/Project.php

@@ -36,6 +36,7 @@ class Project extends Model
         'end',
         'customer_email',
         'customer_name',
+        'next_invoice_count',
     ];
 
 
@@ -56,6 +57,14 @@ class Project extends Model
         return (is_null($this->start_date)) ? '' : Carbon::createFromFormat('Y-m-d', $this->start_date)->format('d.m.Y');
     }
 
+    /**
+     * Get the next invoice number for this project.
+     */
+    public function getNextInvoiceCountAttribute(): int
+    {
+        return $this->invoices()->max('project_count') + 1 ?? 1;
+    }
+
     /**
      * Get the end_date attribute in local format.
      */
@@ -72,6 +81,9 @@ class Project extends Model
         return $this->belongsTo(Customer::class)->withTrashed();
     }
 
+    /**
+     * Get the invoices for this project.
+     */
     public function invoices(): HasMany
     {
         return $this->hasMany(Invoice::class);