From 8966b76667eb8de528ed4cc935cf4e1d2dec96a8 Mon Sep 17 00:00:00 2001
From: Jonas Staudenmeir <mail@jonas-staudenmeir.de>
Date: Fri, 11 Oct 2024 22:29:22 +0200
Subject: [PATCH] Support HasManyDeep::one()

---
 src/HasManyDeep.php       | 26 ++++++++++++++++++++++++++
 tests/HasManyDeepTest.php |  7 +++++++
 2 files changed, 33 insertions(+)

diff --git a/src/HasManyDeep.php b/src/HasManyDeep.php
index f407cf1..2210c3e 100644
--- a/src/HasManyDeep.php
+++ b/src/HasManyDeep.php
@@ -238,4 +238,30 @@ public function getLocalKeys()
     {
         return $this->localKeys;
     }
+
+    /**
+     * Convert the relationship to a "has one deep" relationship.
+     *
+     * @phpstan-ignore-next-line
+     * @return \Staudenmeir\EloquentHasManyDeep\HasOneDeep<TRelatedModel, TDeclaringModel>
+     */
+    public function one()
+    {
+        $query = $this->getQuery();
+
+        $query->getQuery()->joins = [];
+
+        /** @var \Staudenmeir\EloquentHasManyDeep\HasOneDeep<TRelatedModel, TDeclaringModel> $hasOneDeep */
+        $hasOneDeep = HasOneDeep::noConstraints(
+            fn () => new HasOneDeep(
+                $query,
+                $this->farParent,
+                $this->throughParents,
+                $this->foreignKeys,
+                $this->localKeys
+            )
+        );
+
+        return $hasOneDeep;
+    }
 }
diff --git a/tests/HasManyDeepTest.php b/tests/HasManyDeepTest.php
index e10ba66..096bdfa 100644
--- a/tests/HasManyDeepTest.php
+++ b/tests/HasManyDeepTest.php
@@ -183,4 +183,11 @@ public function testWithTrashedIntermediateAndWithCount(): void
 
         $this->assertEquals(3, $country->count);
     }
+
+    public function testOne(): void
+    {
+        $comment = Country::find(1)->comments()->one()->first();
+
+        $this->assertEquals(31, $comment->id);
+    }
 }