[11.x] Bugfix for calling pluck() on chaperoned relations. (#52680)

* Added failing test for hydrating inverse relations

This test should fail if non-models are passed to
`applyInverseRelationToCollection()`, e.g. when
`pluck()` is called on a query.

* Only attempt inverse hydration on models.

src/Illuminate/Database/Eloquent/Relations/Concerns/SupportsInverseRelations.php

@@ -97,7 +97,7 @@ protected function applyInverseRelationToCollection($models, ?Model $parent = nu
         $parent ??= $this->getParent();
 
         foreach ($models as $model) {
-            $this->applyInverseRelationToModel($model, $parent);
+            $model instanceof Model && $this->applyInverseRelationToModel($model, $parent);
         }
 
         return $models;

tests/Database/DatabaseEloquentInverseRelationTest.php

@@ -272,6 +272,27 @@ public function testSetsGuessedInverseRelationBasedOnForeignKey()
         $this->assertSame('test', $relation->getInverseRelationship());
     }
 
+    public function testOnlyHydratesInverseRelationOnModels()
+    {
+        $relation = m::mock(HasInverseRelationStub::class)->shouldAllowMockingProtectedMethods()->makePartial();
+        $relation->shouldReceive('getParent')->andReturn(new HasInverseRelationParentStub);
+        $relation->shouldReceive('applyInverseRelationToModel')->times(6);
+        $relation->exposeApplyInverseRelationToCollection([
+            new HasInverseRelationRelatedStub(),
+            12345,
+            new HasInverseRelationRelatedStub(),
+            new HasInverseRelationRelatedStub(),
+            Model::class,
+            new HasInverseRelationRelatedStub(),
+            true,
+            [],
+            new HasInverseRelationRelatedStub(),
+            'foo',
+            new class() {},
+            new HasInverseRelationRelatedStub(),
+        ]);
+    }
+
     public static function guessedParentRelationsDataProvider()
     {
         yield ['hasInverseRelationParentStub'];
@@ -361,4 +382,9 @@ public function exposeGuessInverseRelation(): string|null
     {
         return $this->guessInverseRelation();
     }
+
+    public function exposeApplyInverseRelationToCollection($models, ?Model $parent = null)
+    {
+        return $this->applyInverseRelationToCollection($models, $parent);
+    }
 }