Fix #2752

app/Api/V1/Controllers/TransactionController.php

@@ -251,6 +251,19 @@ class TransactionController extends Controller
         return response()->json($manager->createData($resource)->toArray())->header('Content-Type', 'application/vnd.api+json');
     }
 
+    /**
+     * Show a single transaction, by transaction journal.
+     *
+     * @param TransactionJournal $transactionJournal
+     *
+     * @return JsonResponse
+     * @codeCoverageIgnore
+     */
+    public function showByJournal(TransactionJournal $transactionJournal): JsonResponse
+    {
+        return $this->show($transactionJournal->transactionGroup);
+    }
+
     /**
      * Store a new transaction.
      *

routes/api.php

@@ -424,6 +424,17 @@ Route::group(
     }
 );
 
+// special group for transaction journals
+Route::group(
+    ['namespace' => 'FireflyIII\Api\V1\Controllers', 'prefix' => 'journals',
+     'as'         => 'api.v1.journals.'],
+    static function () {
+
+        // Transaction API routes:
+        Route::get('{tj}', ['uses' => 'TransactionController@showByJournal', 'as' => 'showByJournal']);
+    }
+);
+
 
 Route::group(
     ['middleware' => ['auth:api', 'bindings', \FireflyIII\Http\Middleware\IsAdmin::class], 'namespace' => 'FireflyIII\Api\V1\Controllers', 'prefix' => 'users',