Added relations loading

Author: babenkoivan

README.md

@@ -221,6 +221,14 @@ App\MyModel::search('phone')
     ->get();
 ```
 
+If you need to load relations you can use the `with` method:
+
+```php
+App\MyModel::search('phone') 
+    ->with('makers')
+    ->get();
+```
+
 In addition to standard functionality the package offers you the possibility to filter data in Elasticsearch without specifying a query string:
 
 ```php

src/Builders/FilterBuilder.php

@@ -11,6 +11,8 @@ class FilterBuilder extends Builder
         'must_not' => []
     ];
 
+    public $with;
+
     public function __construct($model, $callback = null)
     {
         $this->model = $model;
@@ -133,4 +135,11 @@ public function buildPayload()
     {
         return $this->engine()->buildSearchQueryPayloadCollection($this);
     }
+
+    public function with($relations)
+    {
+        $this->with = $relations;
+
+        return $this;
+    }
 }

src/ElasticEngine.php

@@ -224,4 +224,18 @@ public function getTotalCount($results)
     {
         return $results['hits']['total'];
     }
+
+    /**
+     * @inheritdoc
+     */
+    public function get(Builder $builder)
+    {
+        $collection = parent::get($builder);
+
+        if (isset($builder->with) && $collection->count() > 0) {
+            $collection->load($builder->with);
+        }
+
+        return $collection;
+    }
 }