Add invoice history as an optional include

app/Models/Invoice.php

@@ -19,6 +19,7 @@ use App\Helpers\Invoice\InvoiceSumInclusive;
 use App\Jobs\Client\UpdateClientBalance;
 use App\Jobs\Company\UpdateCompanyLedgerWithInvoice;
 use App\Jobs\Invoice\CreateInvoicePdf;
+use App\Models\Backup;
 use App\Models\CompanyLedger;
 use App\Models\Currency;
 use App\Models\Filterable;
@@ -208,7 +209,7 @@ class Invoice extends BaseModel
 
     public function history()
     {
-        $this->activities->with('backup');
+        return $this->hasManyThrough(Backup::class, Activity::class);
     }
 
     // public function credits()

app/Transformers/InvoiceHistoryTransformer.php

@@ -0,0 +1,38 @@
+<?php
+/**
+ * Invoice Ninja (https://invoiceninja.com)
+ *
+ * @link https://github.com/invoiceninja/invoiceninja source repository
+ *
+ * @copyright Copyright (c) 2020. Invoice Ninja LLC (https://invoiceninja.com)
+ *
+ * @license https://opensource.org/licenses/AAL
+ */
+
+namespace App\Transformers;
+
+use App\Models\Backup;
+use App\Utils\Traits\MakesHash;
+
+class InvoiceHistoryTransformer extends EntityTransformer
+{
+    use MakesHash;
+
+    protected $defaultIncludes = [
+    ];
+
+    protected $availableIncludes = [
+    ];
+
+    public function transform(Backup $backup)
+    {
+        return [
+            'id' => $this->encodePrimaryKey($backup->id),
+            'activity_id' => $this->encodePrimaryKey($backup->activity_id),
+            'json_backup' => (string) $backup->json_backup ?: '',
+            'html_backup' => (string) $backup->html_backup ?: '',
+            'created_at' => (int)$backup->created_at,
+            'updated_at' => (int)$backup->updated_at,
+        ];
+    }
+}

app/Transformers/InvoiceTransformer.php

@@ -11,10 +11,12 @@
 
 namespace App\Transformers;
 
+use App\Models\Backup;
 use App\Models\Document;
 use App\Models\Invoice;
 use App\Models\InvoiceInvitation;
 use App\Transformers\DocumentTransformer;
+use App\Transformers\InvoiceHistoryTransformer;
 use App\Transformers\InvoiceInvitationTransformer;
 use App\Utils\Traits\MakesHash;
 
@@ -29,6 +31,7 @@ class InvoiceTransformer extends EntityTransformer
 
     protected $availableIncludes = [
         'invitations',
+        'history'
     //    'payments',
     //    'client',
     //    'documents',
@@ -40,16 +43,15 @@ class InvoiceTransformer extends EntityTransformer
 
         return $this->includeCollection($invoice->invitations, $transformer, InvoiceInvitation::class);
     }
+
+    public function includeHistory(Invoice $invoice)
+    {
+        $transformer = new InvoiceHistoryTransformer($this->serializer);
+
+        return $this->includeCollection($invoice->history, $transformer, Backup::class);
+    }
+    
     /*
-        public function includeInvoiceItems(Invoice $invoice)
-        {
-            $transformer = new InvoiceItemTransformer($this->serializer);
-
-            return $this->includeCollection($invoice->invoice_items, $transformer, ENTITY_INVOICE_ITEM);
-        }
-
-
-
         public function includePayments(Invoice $invoice)
         {
             $transformer = new PaymentTransformer($this->account, $this->serializer, $invoice);