From 80f1791ee4c305705aa1fe093ccba3eb89880401 Mon Sep 17 00:00:00 2001
From: Caleb White <cdwhite3@pm.me>
Date: Tue, 8 Sep 2026 08:50:29 -0500
Subject: [PATCH] feat: support subqueries in whereKey

---
 src/Illuminate/Database/Eloquent/Builder.php  |  6 +++
 .../Database/DatabaseEloquentBuilderTest.php  | 37 +++++++++++++++++++
 2 files changed, 43 insertions(+)

diff --git a/src/Illuminate/Database/Eloquent/Builder.php b/src/Illuminate/Database/Eloquent/Builder.php
index a1f13ea8ae0d..5d7e6c70235e 100755
--- a/src/Illuminate/Database/Eloquent/Builder.php
+++ b/src/Illuminate/Database/Eloquent/Builder.php
@@ -280,6 +280,12 @@ public function whereKey(mixed $id, string $boolean = 'and', bool $not = false):
             $id = $id->getKey();
         }
 
+        if ($id instanceof Closure || $id instanceof QueryBuilder || $id instanceof self || $id instanceof Relation) {
+            $this->query->whereIn($this->model->getQualifiedKeyName(), $id, $boolean, $not);
+
+            return $this;
+        }
+
         if (is_array($id) || $id instanceof Arrayable) {
             if (in_array($this->model->getKeyType(), ['int', 'integer'])) {
                 $this->query->whereIntegerInRaw($this->model->getQualifiedKeyName(), $id, $boolean, $not);
diff --git a/tests/Database/DatabaseEloquentBuilderTest.php b/tests/Database/DatabaseEloquentBuilderTest.php
index 6f0094cec0b3..a601e0b5b160 100755
--- a/tests/Database/DatabaseEloquentBuilderTest.php
+++ b/tests/Database/DatabaseEloquentBuilderTest.php
@@ -2410,6 +2410,31 @@ public function testWhereKeyMethodWithCollection()
         $builder->whereKey($collection);
     }
 
+    public function testWhereKeyMethodWithClosure()
+    {
+        $model = new EloquentBuilderTestStub;
+        $this->mockConnectionForModel($model, 'SQLite');
+
+        $query = $model->newQuery()->whereKey(function ($query) {
+            $query->select('id')->from('users')->where('active', true);
+        });
+
+        $this->assertSame('select * from "table" where "table"."id" in (select "id" from "users" where "active" = ?)', $query->toSql());
+        $this->assertEquals([true], $query->getBindings());
+    }
+
+    public function testWhereKeyMethodWithSubquery()
+    {
+        $model = new EloquentBuilderTestStub;
+        $this->mockConnectionForModel($model, 'SQLite');
+
+        $subquery = $model->newQuery()->select('id')->where('active', true);
+        $query = $model->newQuery()->whereKey($subquery);
+
+        $this->assertSame('select * from "table" where "table"."id" in (select "id" from "table" where "active" = ?)', $query->toSql());
+        $this->assertEquals([true], $query->getBindings());
+    }
+
     public function testWhereKeyMethodWithModel()
     {
         $model = new EloquentBuilderTestStubStringPrimaryKey;
@@ -2494,6 +2519,18 @@ public function testWhereKeyNotMethodWithCollection()
         $builder->whereKeyNot($collection);
     }
 
+    public function testWhereKeyNotMethodWithSubquery()
+    {
+        $model = new EloquentBuilderTestStub;
+        $this->mockConnectionForModel($model, 'SQLite');
+
+        $subquery = $model->newQuery()->select('id')->where('active', true);
+        $query = $model->newQuery()->whereKeyNot($subquery);
+
+        $this->assertSame('select * from "table" where "table"."id" not in (select "id" from "table" where "active" = ?)', $query->toSql());
+        $this->assertEquals([true], $query->getBindings());
+    }
+
     public function testWhereKeyNotMethodWithModel()
     {
         $model = new EloquentBuilderTestStubStringPrimaryKey;