accept closure attributes (eg wrapper.class)

src/Kris/LaravelFormBuilder/Fields/FormField.php

@@ -334,13 +334,13 @@ protected function prepareOptions(array $options = [])
             }
         }
 
-        $this->setOption('wrapperAttrs', $helper->prepareAttributes($this->getOption('wrapper')));
-        $this->setOption('errorAttrs', $helper->prepareAttributes($this->getOption('errors')));
+        $this->setOption('wrapperAttrs', $helper->prepareAttributes($this->getOption('wrapper'), $this));
+        $this->setOption('errorAttrs', $helper->prepareAttributes($this->getOption('errors'), $this));
 
         if ($this->getOption('help_block.text')) {
             $this->setOption(
                 'help_block.helpBlockAttrs',
-                $helper->prepareAttributes($this->getOption('help_block.attr'))
+                $helper->prepareAttributes($this->getOption('help_block.attr'), $this)
             );
         }
 

src/Kris/LaravelFormBuilder/FormHelper.php

@@ -188,7 +188,7 @@ public function getFieldType($type)
      * @param $options
      * @return string
      */
-    public function prepareAttributes($options)
+    public function prepareAttributes($options, ...$optionalArguments)
     {
         if (!$options) {
             return null;
@@ -199,7 +199,7 @@ public function prepareAttributes($options)
         foreach ($options as $name => $option) {
             if ($option !== null) {
                 $name = is_numeric($name) ? $option : $name;
-                $attributes[] = $name . '="' . $option . '" ';
+                $attributes[] = $name . '="' . value($option, ...$optionalArguments) . '" ';
             }
         }
 

tests/Fields/CollectionTypeTest.php

@@ -109,6 +109,30 @@ public function it_creates_collection_with_child_form()
             $this->assertEquals(2, count($childFormCollection->getChildren()));
         }
 
+        /** @test */
+        public function it_can_assign_dynamic_classes_to_child_forms()
+        {
+            $items = new \Illuminate\Support\Collection([
+                (new DummyEloquentModel2())->forceFill(['id' => 1, 'foo' => 'a']),
+                (new DummyEloquentModel2())->forceFill(['id' => 2, 'foo' => 'b']),
+                (new DummyEloquentModel2())->forceFill(['id' => 3, 'foo' => 'c']),
+            ]);
+
+            $model = (new DummyEloquentModel())->forceFill(['id' => 11]);
+            $model->setRelation('items', $items);
+
+            $form = $this->formBuilder->create('LaravelFormBuilderCollectionTypeTest\Forms\WithDynamicAttributesFormCollectionForm', [
+                'model' => $model,
+            ]);
+
+            $html = $form->renderForm();
+
+            $timesAlwaysClass = count(explode('always-class', $html)) - 1;
+            $timesOnceClass = count(explode('once-class', $html)) - 1;
+            $this->assertEquals(3, $timesAlwaysClass);
+            $this->assertEquals(1, $timesOnceClass);
+        }
+
         /** @test */
         public function it_creates_collection_with_child_form_with_correct_model()
         {
@@ -391,4 +415,28 @@ function buildForm()
             ]);
         }
     }
+
+    class WithDynamicAttributesFormCollectionForm extends Form
+    {
+        function buildForm()
+        {
+            $this->add('items', 'collection', [
+                'type' => 'form',
+                'prototype' => false,
+                'empty_row' => false,
+                'options' => [
+                    'class' => NamespacedDummyFormCollectionChildForm::class,
+                    'wrapper' => [
+                        'class' => function(\Kris\LaravelFormBuilder\Fields\FormField $field) {
+                            $form = $field->getForm();
+                            $model = $form ? $form->getModel() : null;
+                            $id = $model ? $model->id : 0;
+                            $onceClass = $id == 2 ? 'once-class' : '';
+                            return "always-class $onceClass";
+                        },
+                    ],
+                ],
+            ]);
+        }
+    }
 }