Fix: Override BelongsToMany::cursor() to hydrate pivot relations (#30580)

Author: mpyw

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

@@ -749,6 +749,22 @@ public function each(callable $callback, $count = 1000)
         });
     }
 
+    /**
+     * Get a lazy collection for the given query.
+     *
+     * @return \Illuminate\Support\LazyCollection
+     */
+    public function cursor()
+    {
+        $this->query->addSelect($this->shouldSelect());
+
+        return $this->query->cursor()->map(function ($model) {
+            $this->hydratePivotRelation([$model]);
+
+            return $model;
+        });
+    }
+
     /**
      * Hydrate the pivot table relationship on the models.
      *

tests/Database/DatabaseEloquentIntegrationTest.php

@@ -767,6 +767,18 @@ public function testBelongsToManyRelationshipModelsAreProperlyHydratedOverEachRe
         });
     }
 
+    public function testBelongsToManyRelationshipModelsAreProperlyHydratedOverCursorRequest()
+    {
+        $user = EloquentTestUser::create(['email' => '[email protected]']);
+        $friend = $user->friends()->create(['email' => '[email protected]']);
+
+        foreach (EloquentTestUser::first()->friends()->cursor() as $result) {
+            $this->assertSame('[email protected]', $result->email);
+            $this->assertEquals($user->id, $result->pivot->user_id);
+            $this->assertEquals($friend->id, $result->pivot->friend_id);
+        }
+    }
+
     public function testBasicHasManyEagerLoading()
     {
         $user = EloquentTestUser::create(['email' => '[email protected]']);