Remove previous exception

Author: Maxim Lanin

src/ApiException.php

@@ -4,6 +4,7 @@
 
 use Illuminate\Contracts\Support\Arrayable;
 use Illuminate\Contracts\Support\Jsonable;
+use Lanin\Laravel\ApiExceptions\Contracts\ShowsPrevious;
 use Lanin\Laravel\ApiExceptions\Contracts\ShowsTrace;
 use Symfony\Component\Debug\Exception\FlattenException;
 
@@ -65,7 +66,7 @@ public function toArray()
     {
         $e = $this;
 
-        if (env('APP_DEBUG') && $this->getPrevious() !== null) {
+        if (env('APP_DEBUG') && $e instanceof ShowsPrevious && $this->getPrevious() !== null) {
             $e = $this->getPrevious();
         }
 

src/Contracts/ShowsPrevious.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace Lanin\Laravel\ApiExceptions\Contracts;
+
+interface ShowsPrevious
+{
+
+}

src/InternalServerErrorApiException.php

@@ -3,9 +3,10 @@
 namespace Lanin\Laravel\ApiExceptions;
 
 use Exception;
+use Lanin\Laravel\ApiExceptions\Contracts\ShowsPrevious;
 use Lanin\Laravel\ApiExceptions\Contracts\ShowsTrace;
 
-class InternalServerErrorApiException extends ApiException implements ShowsTrace
+class InternalServerErrorApiException extends ApiException implements ShowsTrace, ShowsPrevious
 {
     /**
      * @param string $message