[8.x] Revert "[8.x] Add nested relationships to whereRelation function (

laravel#39064)" (laravel#39130)

* Revert "[8.x] Add nested relationships to whereRelation function (laravel#39064)"

This reverts commit bc92a96.

* Add tests for nested whereRelation queries

tests/Integration/Database/EloquentWhereHasTest.php

@@ -26,6 +26,12 @@ protected function setUp()
             $table->boolean('public');
         });
 
+        Schema::create('texts', function (Blueprint $table) {
+            $table->increments('id');
+            $table->unsignedInteger('post_id');
+            $table->boolean('content');
+        });
+
         Schema::create('comments', function (Blueprint $table) {
             $table->increments('id');
             $table->string('commentable_type');
@@ -35,10 +41,12 @@ protected function setUp()
         $user = User::create();
         $post = tap((new Post(['public' => true]))->user()->associate($user))->save();
         (new Comment)->commentable()->associate($post)->save();
+        (new Text(['content' => 'test']))->post()->associate($post)->save();
 
         $user = User::create();
         $post = tap((new Post(['public' => false]))->user()->associate($user))->save();
         (new Comment)->commentable()->associate($post)->save();
+        (new Text(['content' => 'test2']))->post()->associate($post)->save();
     }
 
     public function testWhereRelation()
@@ -55,6 +63,20 @@ public function testOrWhereRelation()
         $this->assertEquals([1, 2], $users->pluck('id')->all());
     }
 
+    public function testNestedWhereRelation()
+    {
+        $texts = User::whereRelation('posts.texts', 'content', 'test')->get();
+
+        $this->assertEquals([1], $texts->pluck('id')->all());
+    }
+
+    public function testNestedOrWhereRelation()
+    {
+        $texts = User::whereRelation('posts.texts', 'content', 'test')->orWhereRelation('posts.texts', 'content', 'test2')->get();
+
+        $this->assertEquals([1, 2], $texts->pluck('id')->all());
+    }
+
     public function testWhereMorphRelation()
     {
         $comments = Comment::whereMorphRelation('commentable', '*', 'public', true)->get();
@@ -104,12 +126,29 @@ public function comments()
         return $this->morphMany(Comment::class, 'commentable');
     }
 
+    public function texts()
+    {
+        return $this->hasMany(Text::class);
+    }
+
     public function user()
     {
         return $this->belongsTo(User::class);
     }
 }
 
+class Text extends Model
+{
+    public $timestamps = false;
+
+    protected $guarded = [];
+
+    public function post()
+    {
+        return $this->belongsTo(Post::class);
+    }
+}
+
 class User extends Model
 {
     public $timestamps = false;