[9.x] Fix base query for relationships (#41918)

* Fix base query for relationships

* Add test

Author: driesvints

src/Illuminate/Database/Eloquent/Relations/Relation.php

@@ -317,7 +317,7 @@ public function getBaseQuery()
      */
     public function toBase()
     {
-        return $this->query->getQuery();
+        return $this->query->applyScopes()->getQuery();
     }
 
     /**

tests/Database/DatabaseEloquentSoftDeletesIntegrationTest.php

@@ -123,6 +123,19 @@ public function testSoftDeletesAreNotRetrievedFromBaseQuery()
         $this->assertCount(1, $query->get());
     }
 
+    public function testSoftDeletesAreNotRetrievedFromRelationshipBaseQuery()
+    {
+        [, $abigail] = $this->createUsers();
+
+        $abigail->posts()->create(['title' => 'Foo']);
+        $abigail->posts()->create(['title' => 'Bar'])->delete();
+
+        $query = $abigail->posts()->toBase();
+
+        $this->assertInstanceOf(Builder::class, $query);
+        $this->assertCount(1, $query->get());
+    }
+
     public function testSoftDeletesAreNotRetrievedFromBuilderHelpers()
     {
         $this->createUsers();
@@ -867,13 +880,17 @@ public function testMorphToNonSoftDeletingModel()
 
     /**
      * Helpers...
+     *
+     * @return \Illuminate\Tests\Database\SoftDeletesTestUser[]
      */
     protected function createUsers()
     {
         $taylor = SoftDeletesTestUser::create(['id' => 1, 'email' => '[email protected]']);
-        SoftDeletesTestUser::create(['id' => 2, 'email' => '[email protected]']);
+        $abigail = SoftDeletesTestUser::create(['id' => 2, 'email' => '[email protected]']);
 
         $taylor->delete();
+
+        return [$taylor, $abigail];
     }
 
     /**