Add additional tests for various iterators.

Expand documentation and tests for iterators.

src/View/Form/EntityContext.php

@@ -19,6 +19,8 @@ use Cake\ORM\Entity;
 use Cake\ORM\TableRegistry;
 use Cake\Utility\Inflector;
 use Cake\Validation\Validator;
+use IteratorAggregate;
+use IteratorIterator;
 use Traversable;
 
 /**
@@ -89,12 +91,31 @@ class EntityContext {
 /**
  * Prepare some additional data from the context.
  *
+ * If the table option was provided to the constructor and it
+ * was a string, ORM\TableRegistry will be used to get the correct table instance.
+ *
+ * If an object is provided as the table option, it will be used as is.
+ *
+ * If no table option is provided, the table name will be derived based on
+ * naming conventions. This inference will work with a number of common objects
+ * like arrays, Collection objects and ResultSets.
+ *
  * @return void
+ * @throws \RuntimeException When a table object cannot be located/inferred.
  */
 	protected function _prepare() {
 		$table = $this->_context['table'];
 		if (empty($table)) {
 			$entity = $this->_context['entity'];
+			if ($entity instanceof IteratorAggregate) {
+				$entity = $entity->getIterator()->current();
+			} elseif ($entity instanceof IteratorIterator) {
+				$entity = $entity->getInnerIterator()->current();
+			} elseif ($entity instanceof Traversable) {
+				$entity = $entity->current();
+			} elseif (is_array($entity)) {
+				$entity = current($entity);
+			}
 			if ($entity instanceof Entity) {
 				list($ns, $entityClass) = namespaceSplit(get_class($entity));
 				$table = Inflector::pluralize($entityClass);
@@ -103,6 +124,7 @@ class EntityContext {
 		if (is_string($table)) {
 			$table = TableRegistry::get($table);
 		}
+
 		if (!is_object($table)) {
 			throw new \RuntimeException(
 				'Unable to find table class for current entity'

tests/TestCase/View/Form/EntityContextTest.php

@@ -22,6 +22,7 @@ use Cake\ORM\TableRegistry;
 use Cake\TestSuite\TestCase;
 use Cake\Validation\Validator;
 use Cake\View\Form\EntityContext;
+use ArrayIterator;
 use ArrayObject;
 
 /**
@@ -76,6 +77,24 @@ class EntityContextTest extends TestCase {
 	}
 
 /**
+ * Test collection operations that lack a table argument.
+ *
+ * @dataProvider collectionProvider
+ * @return void
+ */
+	public function testCollectionOperationsNoTableArg($collection) {
+		$context = new EntityContext($this->request, [
+			'entity' => $collection,
+		]);
+
+		$result = $context->val('0.title');
+		$this->assertEquals('First post', $result);
+
+		$result = $context->error('1.body');
+		$this->assertEquals(['Not long enough'], $result);
+	}
+
+/**
  * Data provider for testing collections.
  *
  * @return array
@@ -98,6 +117,7 @@ class EntityContextTest extends TestCase {
 		return [
 			'array' => [[$one, $two]],
 			'basic iterator' => [new ArrayObject([$one, $two])],
+			'array iterator' => [new ArrayIterator([$one, $two])],
 			'collection' => [new Collection([$one, $two])],
 		];
 	}