added casting value

Author: Alexmg86

README.md

@@ -14,6 +14,7 @@ I often use this in my work and I hope it will be useful to you!
 
 ## Last added
 
+2020/12/10 - Added casting for withSum('items:price:signed') and others  
 2020/11/03 - Added method [withMath](https://github.com/Alexmg86/laravel-sub-query#working-with-columns)  
 2020/10/21 - Added [some sugar](https://github.com/Alexmg86/laravel-sub-query#sugar)  
 2020/10/06 - Added caching of [received data](https://github.com/Alexmg86/laravel-sub-query#caching)
@@ -53,6 +54,10 @@ echo $invoices[0]->items_price_min;
 echo $invoices[0]->items_price_max;
 echo $invoices[0]->items_price_avg;
 ```
+The resulting value can be loaded through the third parameter. Some types for example: date, datetime, time, char, signed, unsigned, binary.
+```php
+$invoices = Invoice::withSum('items:price:signed')->get();
+```
 ### The following methods apply to all methods!!!
 
 You may add the sum for multiple relations as well as add constraints to the queries:

src/LaravelSubQuery.php

@@ -112,6 +112,11 @@ protected function withSubQuery($relations, $type, $orderType = null)
             // as a sub-select. First, we'll get the "has" query and use that to get the relation
             // sum query. We will normalize the relation name then append _{column}_sum as the name.
             foreach ($columns as $column) {
+                $queryRow = '' . $type . '(' . $column . ')';
+                if (isset($nameExplode[2])) {
+                    $queryRow = 'CAST(' . $type . '(' . $column . ') as ' . $nameExplode[2] . ')';
+                }
+
                 $query = $relation->getRelationExistenceQuery(
                     $relation->getRelated()->newQuery(),
                     $this,

tests/LaravelSubQueryWithSumTest.php

@@ -131,4 +131,19 @@ public function testSortingScopes()
         $query .= ' from "invoices"';
         $this->assertSame($query, $result);
     }
+
+    public function testCastColumn()
+    {
+        $invoice = Invoice::create(['id' => 1, 'name' => 'text_name']);
+        for ($i = 1; $i < 11; $i++) {
+            Item::create(['invoice_id' => $invoice->id, 'price' => $i, 'price2' => $i + 1]);
+        }
+
+        $results = Invoice::withSum('items:price,price2:signed');
+
+        $this->assertEquals(
+            ['id' => 1, 'name' => 'text_name', 'items_price_sum' => 55, 'items_price2_sum' => 65],
+            $results->first()->toArray()
+        );
+    }
 }