Add DatabasePresenceVerifier and tests

src/Jenssegers/Mongodb/Validation/DatabasePresenceVerifier.php

+<?php namespace Jenssegers\Mongodb\Validation;
+
+class DatabasePresenceVerifier extends \Illuminate\Validation\DatabasePresenceVerifier
+{
+    /**
+     * Count the number of objects in a collection having the given value.
+     *
+     * @param  string  $collection
+     * @param  string  $column
+     * @param  string  $value
+     * @param  int     $excludeId
+     * @param  string  $idColumn
+     * @param  array   $extra
+     * @return int
+     */
+    public function getCount($collection, $column, $value, $excludeId = null, $idColumn = null, array $extra = [])
+    {
+        $query = $this->table($collection)->where($column, 'regex', "/$value/i");
+
+        if (! is_null($excludeId) && $excludeId != 'NULL') {
+            $query->where($idColumn ?: 'id', '<>', $excludeId);
+        }
+
+        foreach ($extra as $key => $extraValue) {
+            $this->addWhere($query, $key, $extraValue);
+        }
+
+        return $query->count();
+    }
+
+    /**
+     * Count the number of objects in a collection with the given values.
+     *
+     * @param  string  $collection
+     * @param  string  $column
+     * @param  array   $values
+     * @param  array   $extra
+     * @return int
+     */
+    public function getMultiCount($collection, $column, array $values, array $extra = [])
+    {
+        foreach ($values as &$value) {
+            $value = new \MongoRegex("/$value/i");
+        }
+        
+        $query = $this->table($collection)->whereIn($column, $values);
+
+        foreach ($extra as $key => $extraValue) {
+            $this->addWhere($query, $key, $extraValue);
+        }
+
+        return $query->count();
+    }
+}

src/Jenssegers/Mongodb/Validation/ValidationServiceProvider.php

+<?php namespace Jenssegers\Mongodb\Validation;
+
+use Illuminate\Validation\ValidationServiceProvider as BaseProvider;
+
+class ValidationServiceProvider extends BaseProvider
+{
+    protected function registerPresenceVerifier()
+    {
+        $this->app->singleton('validation.presence', function ($app) {
+            return new DatabasePresenceVerifier($app['db']);
+        });
+    }
+}
\ No newline at end of file

tests/TestCase.php

@@ -29,6 +29,7 @@ class TestCase extends Orchestra\Testbench\TestCase
         return [
             Jenssegers\Mongodb\MongodbServiceProvider::class,
             Jenssegers\Mongodb\Auth\PasswordResetServiceProvider::class,
+            Jenssegers\Mongodb\Validation\ValidationServiceProvider::class
         ];
     }
 

tests/ValidationTest.php

@@ -22,5 +22,53 @@ class ValidationTest extends TestCase
             ['name' => 'required|unique:users']
         );
         $this->assertTrue($validator->fails());
+
+        $validator = Validator::make(
+            ['name' => 'John doe'],
+            ['name' => 'required|unique:users']
+        );
+        $this->assertTrue($validator->fails());
+
+        $validator = Validator::make(
+            ['name' => 'john doe'],
+            ['name' => 'required|unique:users']
+        );
+        $this->assertTrue($validator->fails());
+
+        $validator = Validator::make(
+            ['name' => 'test doe'],
+            ['name' => 'required|unique:users']
+        );
+        $this->assertFalse($validator->fails());
+    }
+
+    public function testExists()
+    {
+        $validator = Validator::make(
+            ['name' => 'John Doe'],
+            ['name' => 'required|exists:users']
+        );
+        $this->assertTrue($validator->fails());
+
+        User::create(['name' => 'John Doe']);
+        User::create(['name' => 'Test Name']);
+
+        $validator = Validator::make(
+            ['name' => 'John Doe'],
+            ['name' => 'required|exists:users']
+        );
+        $this->assertFalse($validator->fails());
+
+        $validator = Validator::make(
+            ['name' => 'john Doe'],
+            ['name' => 'required|exists:users']
+        );
+        $this->assertFalse($validator->fails());
+
+        $validator = Validator::make(
+            ['name' => ['test name', 'john doe']],
+            ['name' => 'required|exists:users']
+        );
+        $this->assertFalse($validator->fails());
     }
 }