From 771dfb553c938a36dbd9d672b292e53057bbcfb6 Mon Sep 17 00:00:00 2001
From: Moshe Brodsky <44633930+moshe-autoleadstar@users.noreply.github.com>
Date: Thu, 11 Jun 2020 17:03:17 +0300
Subject: [PATCH] Streamline ease of use with relation subquery (#33180)

Since the Relation forwards calls to the query builder object, it can be turned into a subquery just like a regular query builder object
---
 src/Illuminate/Database/Query/Builder.php | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/Illuminate/Database/Query/Builder.php b/src/Illuminate/Database/Query/Builder.php
index 82e7c732c1f4..763da6afc754 100755
--- a/src/Illuminate/Database/Query/Builder.php
+++ b/src/Illuminate/Database/Query/Builder.php
@@ -8,6 +8,7 @@
 use Illuminate\Database\Concerns\BuildsQueries;
 use Illuminate\Database\ConnectionInterface;
 use Illuminate\Database\Eloquent\Builder as EloquentBuilder;
+use Illuminate\Database\Eloquent\Relations\Relation;
 use Illuminate\Database\Query\Grammars\Grammar;
 use Illuminate\Database\Query\Processors\Processor;
 use Illuminate\Pagination\Paginator;
@@ -337,7 +338,7 @@ protected function createSub($query)
      */
     protected function parseSub($query)
     {
-        if ($query instanceof self || $query instanceof EloquentBuilder) {
+        if ($query instanceof self || $query instanceof EloquentBuilder || $query instanceof Relation) {
             return [$query->toSql(), $query->getBindings()];
         } elseif (is_string($query)) {
             return [$query, []];
@@ -3086,6 +3087,7 @@ protected function isQueryable($value)
     {
         return $value instanceof self ||
                $value instanceof EloquentBuilder ||
+               $value instanceof Relation ||
                $value instanceof Closure;
     }