added select method

Author: nahid

examples/index.php

@@ -5,19 +5,20 @@
 use Nahid\JsonQ\Jsonq;
 
 
-$result = '';
-Jsonq::macro('less', function ($payable, $val) {
-    return $payable < $val;
-});
-
-Jsonq::macro('int', function ($payable, $val) {
-    return is_integer($payable);
-});
-
+//$result = '';
+//Jsonq::macro('less', function ($payable, $val) {
+//    return $payable < $val;
+//});
+//
+//Jsonq::macro('int', function ($payable, $val) {
+//    return is_integer($payable);
+//});
+//
 $jq = new Jsonq('data.json');
 
 $result = $jq->from('products')
-    ->where('cat', 'int', 0)
-
-    ->sum('price');
+    ->select('name', 'id')
+    ->where('cat', '=', 2)
+    ->sortBy('user_id', 'asc')
+    ->get();
 dump($result);

src/JsonQueriable.php

@@ -20,6 +20,12 @@ trait JsonQueriable
      */
     protected $_map;
 
+    /**
+     * contains column names
+     * @var array
+     */
+    protected $_select = [];
+
     /**
      * Stores base contents.
      *
@@ -185,6 +191,24 @@ public function isJson($value, $isReturnMap = false)
         return $isReturnMap ? $data : true;
     }
 
+
+    /**
+     * selecting specific column
+     *
+     * @param $array
+     * @return array
+     */
+    protected function selectColumn($array)
+    {
+        $keys = $this->_select;
+
+        if (count($keys) == 0) {
+            return $array;
+        }
+
+        return array_intersect_key($array, array_flip((array) $keys));
+    }
+
     /**
      * Prepare data for result
      *
@@ -195,12 +219,13 @@ public function isJson($value, $isReturnMap = false)
     protected function prepareResult($data, $isObject)
     {
         $output = [];
-        if (is_array($data)) {
+        if ($this->isMultiArray($data)) {
             foreach ($data as $key => $val) {
+                $val = $this->selectColumn($val);
                 $output[$key] = $isObject ? (object) $val : $val;
             }
         } else {
-            $output = json_decode(json_encode($data), $isObject);
+            $output = json_decode(json_encode($this->selectColumn($data)), !$isObject);
         }
 
         return $output;

src/Jsonq.php

@@ -82,6 +82,22 @@ public function at($node = null)
         return $this->from($node);
     }
 
+    /**
+     * select desired column
+     *
+     * @param ... scalar
+     * @return $this
+     */
+    public function select()
+    {
+        $args = func_get_args();
+        if (count($args) > 0 ){
+            $this->_select = $args;
+        }
+
+        return $this;
+    }
+
     /**
      * getting prepared data
      *
@@ -98,7 +114,7 @@ public function get($object = true)
         }
 
         if (!$this->isMultiArray($this->_map)) {
-            return (object) $this->_map;
+            return (object) $this->selectColumn($this->_map);
         }
 
         return $this->prepareResult($this->_map, $object);