Merge pull request #12 from friendsofcat/add-exists-helper-method

Add a exists() method for checking if a feature flag exists

readme.md

@@ -119,6 +119,16 @@ LARAVEL_FEATURE_FLAG_VIEW="layouts.default"
 
 Visit `/admin/feature_flags` to manage features via the UI.
 
+### Checking if a feature flag exists
+For this you can use the exists() method
+
+~~~
+if(\FriendsOfCat\LaravelFeatureFlags\Feature::exists('see-twitter-field'))
+{
+  //do something
+}
+~~~
+
 
 ## Usage Non Auth
 

src/Feature.php

@@ -21,6 +21,18 @@ public function __construct()
         $this->instance = Cache::get(Feature::FEATURE_FLAG_CACHE_KEY, []);
     }
 
+    /**
+    * Check if a feature flag exists.
+    *
+    * @param string $featureKey
+    * @param mixed $variant (optional)
+    * @return bool
+    */
+    public function exists($featureKey)
+    {
+        return isset($this->instance[$featureKey]);
+    }
+
     /**
      * Check if a feature flag is enabled.
      *

tests/FeatureTest.php

@@ -8,6 +8,7 @@
 use FriendsOfCat\LaravelFeatureFlags\FeatureFlag;
 use FriendsOfCat\LaravelFeatureFlags\FeatureFlagUser;
 use FriendsOfCat\LaravelFeatureFlags\FeatureFlagHelper;
+use FriendsOfCat\LaravelFeatureFlags\FeatureFlagsForJavascript;
 use Illuminate\Foundation\Testing\DatabaseTransactions;
 
 /**
@@ -17,6 +18,32 @@ class FeatureTest extends TestCase
 {
     use DatabaseTransactions, FeatureFlagHelper;
 
+    /**
+     * @test
+     * @covers ::isEnabled
+     */
+    public function testExists()
+    {
+        $user = factory(FeatureFlagUser::class)->create();
+        $this->be($user);
+
+        factory(FeatureFlag::class)->create([
+            'key' => 'feature_1',
+            'variants' => 'on'
+        ]);
+
+        factory(FeatureFlag::class)->create([
+            'key' => 'feature_2',
+            'variants' => 'off'
+        ]);
+
+        FeatureFlagsForJavascript::get();
+
+        $this->assertTrue((new Feature)->exists('feature_1'));
+        $this->assertTrue((new Feature)->exists('feature_2'));
+        $this->assertFalse((new Feature)->exists('feature_3'));
+    }
+
     /**
      * @test
      * @covers ::isEnabled