Introduce View::$entity property for entity access

demos/form/form.php

@@ -34,7 +34,7 @@
 $form->onSubmit(static function (Form $form) {
     // implement subscribe here
 
-    return $form->jsSuccess('Subscribed ' . $form->model->get('email') . ' to newsletter.');
+    return $form->jsSuccess('Subscribed ' . $form->entity->get('email') . ' to newsletter.');
 });
 
 $form->buttonSave->set('Subscribe');

src/Form.php

@@ -20,6 +20,9 @@
 use Atk4\Ui\Js\JsExpression;
 use Atk4\Ui\Js\JsExpressionable;
 
+/**
+ * @property false $model use $entity property instead
+ */
 class Form extends View
 {
     use HookTrait;
@@ -359,7 +362,7 @@ public function addGroup($title = null)
      */
     public function controlFactory(Field $field, $controlSeed = []): Control
     {
-        $this->model->assertIsEntity($field->getOwner());
+        $this->entity->assertIsEntity($field->getOwner());
 
         $fallbackSeed = [Control\Line::class];
 
@@ -394,7 +397,7 @@ public function controlFactory(Field $field, $controlSeed = []): Control
 
         $defaults = [
             'form' => $this,
-            'entityField' => new EntityFieldPair($this->model, $field->shortName),
+            'entityField' => new EntityFieldPair($this->entity, $field->shortName),
             'shortName' => $field->shortName,
         ];
 

src/Form/AbstractLayout.php

@@ -37,10 +37,10 @@ protected function _addControl(Control $control, Field $field): Control
      */
     public function addControl(string $name, $control = [], array $fieldSeed = []): Control
     {
-        if ($this->form->model === null) {
-            $this->form->model = (new ProxyModel())->createEntity();
+        if ($this->form->entity === null) {
+            $this->form->entity = (new ProxyModel())->createEntity();
         }
-        $model = $this->form->model->getModel();
+        $model = $this->form->entity->getModel();
 
         // TODO this class should not refer to any specific form control
         $controlClass = is_object($control)

src/View.php

@@ -33,6 +33,7 @@ class View extends AbstractView
     protected array $_jsActions = [];
 
     public ?Model $model = null;
+    public ?Model $entity = null;
 
     /**
      * Name of the region in the parent's template where this object will output itself.
@@ -118,7 +119,13 @@ public function setModel(Model $model): void
             throw new Exception('Different model is already set');
         }
 
-        $this->model = $model;
+        if ($model->isEntity()) {
+            unset($this->{'model'});
+            $this->entity = $model;
+        } else {
+            unset($this->{'entity'});
+            $this->model = $model;
+        }
     }
 
     /**