Add ReactionAlreadyExists::ofType method (#184)

Author: antonkomarev

contracts/Reaction/Exceptions/ReactionAlreadyExists.php

@@ -14,9 +14,17 @@
 namespace Cog\Contracts\Love\Reaction\Exceptions;
 
 use Cog\Contracts\Love\Exceptions\LoveThrowable;
+use Cog\Contracts\Love\ReactionType\Models\ReactionType;
 use RuntimeException;
 
 final class ReactionAlreadyExists extends RuntimeException implements
     LoveThrowable
 {
+    public static function ofType(ReactionType $reactionType): self
+    {
+        return new self(sprintf(
+            'Reaction of type `%s` already exists.',
+            $reactionType->getName()
+        ));
+    }
 }

src/Reacter/Models/Reacter.php

@@ -95,10 +95,7 @@ public function reactTo(
         }
 
         if ($rate === null) {
-            throw new ReactionAlreadyExists(sprintf(
-                'Reaction of type `%s` already exists.',
-                $reactionType->getName()
-            ));
+            throw ReactionAlreadyExists::ofType($reactionType);
         }
 
         $reaction->changeRate($rate);