From ad8170d1048f8a26a2d51f36ef54fe2276beba11 Mon Sep 17 00:00:00 2001
From: Tommy Leirvik <leirvik.tommy@gmail.com>
Date: Sat, 30 Aug 2014 14:49:34 +0200
Subject: [PATCH] Dynamic where rules
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Allow for dynamic where rules example:

'email' => 'exists:staff,email,account_id,1'

rule will be: 'email' => 'exists:staff,email,account_id,{account_id}’

via ->validate($formData, [‘account_id’ => 1]);
---
 .../Validation/FormValidatorSpec.php          | 20 +++++++++-
 src/Laracasts/Validation/FormValidator.php    | 40 ++++++++++++++++++-
 2 files changed, 57 insertions(+), 3 deletions(-)

diff --git a/spec/Laracasts/Validation/FormValidatorSpec.php b/spec/Laracasts/Validation/FormValidatorSpec.php
index 3935ab8..d6d47dc 100644
--- a/spec/Laracasts/Validation/FormValidatorSpec.php
+++ b/spec/Laracasts/Validation/FormValidatorSpec.php
@@ -36,6 +36,20 @@ function it_throws_an_exception_for_invalid_form_data(FactoryInterface $validato
 		$this->shouldThrow('Laracasts\Validation\FormValidationException')->duringValidate($fakeFormData);
 	}
 
+    function it_injects_mappings_into_rules(FactoryInterface $validatorFactory, ValidatorInterface $validator)
+    {
+        $fakeFormData = ['username' => 'joe', 'email' => 'joe@example.com'];
+        $mappings = ['user_id' => 1];
+        $convertedRuleSet = ['username' => 'required', 'email' => 'unique:users,email,1,id'];
+
+        $validatorFactory->make($fakeFormData, $convertedRuleSet, [])->willReturn($validator);
+        $validator->fails()->willReturn(false);
+
+        $this->validate($fakeFormData, $mappings)->shouldReturn(true);
+
+        $this->getValidationRules()->shouldBe($convertedRuleSet);
+    }
+
 	function it_accepts_a_command_object_in_lieu_of_an_input_array(FactoryInterface $validatorFactory, ValidatorInterface $validator)
 	{
 		$formDataAsCommand = new CommandStub;
@@ -44,12 +58,14 @@ function it_accepts_a_command_object_in_lieu_of_an_input_array(FactoryInterface
 		$validatorFactory->make($formDataCastToArray, $this->getValidationRules(), [])->willReturn($validator);
 
 		$this->validate($formDataAsCommand)->shouldReturn(true);
-
 	}
 }
 
 class ExampleValidator extends \Laracasts\Validation\FormValidator {
-	protected $rules = ['username' => 'required'];
+	protected $rules = [
+        'username' => 'required',
+        'email' => 'unique:users,email,{user_id},id'
+    ];
 }
 
 class CommandStub {
diff --git a/src/Laracasts/Validation/FormValidator.php b/src/Laracasts/Validation/FormValidator.php
index ec4fd62..ecbbd09 100644
--- a/src/Laracasts/Validation/FormValidator.php
+++ b/src/Laracasts/Validation/FormValidator.php
@@ -32,11 +32,17 @@ function __construct(ValidatorFactory $validator)
 	 * Validate the form data
 	 *
 	 * @param  mixed $formData
+     * @param  array $mappings
 	 * @return mixed
 	 * @throws FormValidationException
 	 */
-	public function validate($formData)
+	public function validate($formData, $mappings = [])
 	{
+        if ( ! empty($mappings))
+        {
+            $this->replaceRulePlaceholdersWith($mappings);
+        }
+
 		$formData = $this->normalizeFormData($formData);
 
 		$this->validation = $this->validator->make(
@@ -98,4 +104,36 @@ protected function normalizeFormData($formData)
 		return $formData;
 	}
 
+    /**
+     * Go trough all the mappings
+     * and inject the mappings into the rules.
+     *
+     * @param  array $mappings
+     * @return void
+     */
+    protected function replaceRulePlaceholdersWith(array $mappings)
+    {
+        $rules = $this->getValidationRules();
+
+        foreach ($mappings as $search => $value)
+        {
+            $this->injectMappingIntoRules($rules, $search, $value);
+        }
+    }
+
+    /**
+     * Inject a mapping into all defined rules.
+     *
+     * @param  array  $rules
+     * @param  string $search
+     * @param  mixed  $value
+     * @return void
+     */
+    protected function injectMappingIntoRules(array $rules, $search, $value)
+    {
+        foreach ($rules as $field => $rule)
+        {
+            $this->rules[$field] = str_replace('{'.$search.'}', $value, $rule);
+        }
+    }
 }