Fix error when data is excluded by cell_filter

This seems to affect only some old Symfony versions

Author: Jonathan McLean

Form/EventListener/CheckboxRowCreationListener.php

@@ -86,23 +86,25 @@ protected function addCheckbox($options, $choice, FormInterface $form, $value, $
     {
         if (isset($options['cell_filter']) && !$options['cell_filter']($choice, $options['row'])) {
             // Blank cell - put a dummy form control here
-            $form->add($value, LegacyFormUtil::getType('Symfony\Component\Form\Extension\Core\Type\FormType'), array());
+            $formType = LegacyFormUtil::getType('Symfony\Component\Form\Extension\Core\Type\FormType');
         } else {
-            $builder = $this->factory->createNamedBuilder(
-                $value,
-                LegacyFormUtil::getType('Symfony\Component\Form\Extension\Core\Type\CheckboxType'),
-                isset($data[$value]),
-                array(
-                    'auto_initialize' => false,
-                    'required' => false,
-                )
-            );
-
-            if (isset($data[$value])) {
-                $builder->addViewTransformer(new AnythingToBooleanTransformer($data[$value]), true);
-            }
+            $formType = LegacyFormUtil::getType('Symfony\Component\Form\Extension\Core\Type\CheckboxType');
+        }
 
-            $form->add($builder->getForm());
+        $builder = $this->factory->createNamedBuilder(
+            $value,
+            $formType,
+            isset($data[$value]),
+            array(
+                'auto_initialize' => false,
+                'required' => false,
+            )
+        );
+
+        if (isset($data[$value])) {
+            $builder->addViewTransformer(new AnythingToBooleanTransformer($data[$value]), true);
         }
+
+        $form->add($builder->getForm());
     }
 }

Tests/CheckboxGrid/EntityCheckboxGridTest.php

@@ -166,6 +166,31 @@ public function testEntityPreserved()
         $this->assertSame($spa, $salesman->getProductAreas()->first());
     }
 
+    /**
+     * Test that cell_filter tolerates existing data.
+     */
+    public function testCellFilter()
+    {
+        $this->expectSpa();
+
+        $salesman = new TestEntity\Salesman();
+
+        $salesman->addProductArea($spa = new TestEntity\SalesmanProductArea());
+        $spa->setProductSold($this->products[2]); // Desk
+        $spa->setAreaServiced($this->areas[1]); // North side
+
+        // This should run without throwing an error
+        $form = $this->factory->create(LegacyFormUtil::getType('Infinite\FormBundle\Tests\CheckboxGrid\Type\SalesmanType'), $salesman, array(
+            'product_area_options' => array(
+                'cell_filter' => function (TestEntity\Product $x, TestEntity\Area $y) {
+                    return !(
+                        $x === $this->products[2] && $y === $this->areas[1]
+                    );
+                },
+            ),
+        ));
+    }
+
     /**
      * Query builders are allowed on both axes.
      */