Add option to switch from lazy to cursor

Author: yajra

src/Jobs/DataTableExportJob.php

@@ -81,9 +81,15 @@ public function handle()
             )
         );
 
-        foreach ($dataTable->getFilteredQuery()->lazy() as $row) {
+        if (config('datatables-export.method', 'lazy') === 'lazy') {
+            $query = $dataTable->getFilteredQuery()->lazy(config('datatables-export.chunk', 1000));
+        } else {
+            $query = $dataTable->getFilteredQuery()->cursor();
+        }
+
+        foreach ($query as $row) {
             $cells = collect();
-            $columns->map(function (Column $column, $index) use ($row, $cells) {
+            $columns->map(function (Column $column) use ($row, $cells) {
                 $property = $column['data'];
                 $value = Arr::get($row, $property, '');
 

src/config/datatables-export.php

@@ -4,6 +4,20 @@
 
 return [
 
+    /**
+     * Method to use to iterate with the query results.
+     * Options: lazy, cursor
+     *
+     * @link https://laravel.com/docs/eloquent#cursors
+     * @link https://laravel.com/docs/eloquent#chunking-using-lazy-collections
+     */
+    'method' => 'lazy',
+
+    /**
+     * Count chunks to be used when using lazy method.
+     */
+    'chunk' => 1000,
+
     /**
      * Default export format for date.
      */