feat: exclude unavailable assignments from list for teamer

src/Entity/Assignment.php

@@ -350,6 +350,19 @@ class Assignment implements BlameableEntityInterface, TimestampableEntityInterfa
         return $this->applications;
     }
 
+    public function getApplicationByTeamer(Teamer $teamer): ?Application
+    {
+        $applications = $this->applications->filter(function (Application $application) use ($teamer) {
+            return $application->getTeamer() === $teamer;
+        });
+
+        if (0 === count($applications)) {
+            return null;
+        }
+
+        return $applications->first();
+    }
+
     public function getValidApplications(): Collection
     {
         return $this->applications->filter(function (Application $application) {