Merge pull request #171 from vlucas/withDataBugfix

With data bugfix

README.md

@@ -307,6 +307,19 @@ $v->validate();
 
 This introduces a new set of tags to your error language file which looks like `{field}`, if you are using a rule like `equals` you can access the second value in the language file by incrementing the field with a value like `{field1}`.
 
+## Re-use of validation rules
+
+You can re-use your validation rules to quickly validate different data with the same rules by using the withData method:
+
+```php
+$v = new Valitron\Validator(array());
+$v->rule('required', 'name')->message('{field} is required');
+$v->validate(); //false
+
+$v2 = $v->withData(array('name'=>'example'));
+$v2->validate(); //true
+```
+
 ## Running Tests
 
 The test suite depends on the Composer autoloader to load and run the

src/Valitron/Validator.php

@@ -1204,8 +1204,8 @@ class Validator
     public function withData($data, $fields = array())
     {
         $clone = clone $this;
-        $clone->reset();
         $clone->_fields = !empty($fields) ? array_intersect_key($data, array_flip($fields)) : $data;
+        $clone->_errors = array();
         return $clone;
     }
 }

tests/Valitron/ValidateTest.php

@@ -1164,10 +1164,16 @@ class ValidateTest extends BaseTestCase
         //validation failed, so must have errors
         $this->assertFalse($v->validate());
         $this->assertNotEmpty($v->errors());
-        //create copy with different data
+
+        //create copy with valid data
         $v2 = $v->withData(array('name' => 'Chester Tester'));
         $this->assertTrue($v2->validate());
         $this->assertEmpty($v2->errors());
+
+        //create copy with invalid data
+        $v3 = $v->withData(array('firstname' => 'Chester'));
+        $this->assertFalse($v3->validate());
+        $this->assertNotEmpty($v3->errors());
     }
 }