Implemented entity relation checking rule

Author: lookyman

rules.neon

@@ -18,6 +18,7 @@ rules:
 	- PHPStan\Rules\Doctrine\ORM\MagicRepositoryMethodCallRule
 	- PHPStan\Rules\Doctrine\ORM\RepositoryMethodCallRule
 	- PHPStan\Rules\Doctrine\ORM\EntityColumnRule
+	- PHPStan\Rules\Doctrine\ORM\EntityRelationRule
 
 services:
 	-

src/Rules/Doctrine/ORM/EntityRelationRule.php

@@ -0,0 +1,100 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Rules\Doctrine\ORM;
+
+use PhpParser\Node;
+use PHPStan\Analyser\Scope;
+use PHPStan\Reflection\MissingPropertyFromReflectionException;
+use PHPStan\Rules\Rule;
+use PHPStan\Type\Doctrine\ObjectMetadataResolver;
+use PHPStan\Type\IterableType;
+use PHPStan\Type\MixedType;
+use PHPStan\Type\ObjectType;
+use PHPStan\Type\TypeCombinator;
+use PHPStan\Type\VerbosityLevel;
+use function sprintf;
+
+class EntityRelationRule implements Rule
+{
+
+	/** @var \PHPStan\Type\Doctrine\ObjectMetadataResolver */
+	private $objectMetadataResolver;
+
+	public function __construct(ObjectMetadataResolver $objectMetadataResolver)
+	{
+		$this->objectMetadataResolver = $objectMetadataResolver;
+	}
+
+	public function getNodeType(): string
+	{
+		return Node\Stmt\PropertyProperty::class;
+	}
+
+	/**
+	 * @param \PhpParser\Node\Stmt\PropertyProperty $node
+	 * @param \PHPStan\Analyser\Scope $scope
+	 * @return string[]
+	 */
+	public function processNode(Node $node, Scope $scope): array
+	{
+		$class = $scope->getClassReflection();
+		if ($class === null) {
+			return [];
+		}
+
+		$objectManager = $this->objectMetadataResolver->getObjectManager();
+		if ($objectManager === null) {
+			return [];
+		}
+
+		$className = $class->getName();
+		if ($objectManager->getMetadataFactory()->isTransient($className)) {
+			return [];
+		}
+
+		/** @var \Doctrine\ORM\Mapping\ClassMetadataInfo $metadata */
+		$metadata = $objectManager->getClassMetadata($className);
+		$classMetadataInfo = 'Doctrine\ORM\Mapping\ClassMetadataInfo';
+		if (!$metadata instanceof $classMetadataInfo) {
+			return [];
+		}
+
+		$propertyName = (string) $node->name;
+		try {
+			$property = $class->getNativeProperty($propertyName);
+		} catch (MissingPropertyFromReflectionException $e) {
+			return [];
+		}
+
+		if (!isset($metadata->associationMappings[$propertyName])) {
+			return [];
+		}
+		$associationMapping = $metadata->associationMappings[$propertyName];
+
+		$columnType = null;
+		if ((bool) ($associationMapping['type'] & 3)) { // ClassMetadataInfo::TO_ONE
+			$columnType = new ObjectType($associationMapping['targetEntity']);
+			if ($associationMapping['joinColumns'][0]['nullable'] ?? true) {
+				$columnType = TypeCombinator::addNull($columnType);
+			}
+		} elseif ((bool) ($associationMapping['type'] & 12)) { // ClassMetadataInfo::TO_MANY
+			$columnType = TypeCombinator::intersect(
+				new ObjectType('Doctrine\Common\Collections\Collection'),
+				new IterableType(new MixedType(), new ObjectType($associationMapping['targetEntity']))
+			);
+		}
+
+		$errors = [];
+		if ($columnType !== null) {
+			if (!$property->getWritableType()->isSuperTypeOf($columnType)->yes()) {
+				$errors[] = sprintf('Database can contain %s but property expects %s.', $columnType->describe(VerbosityLevel::typeOnly()), $property->getWritableType()->describe(VerbosityLevel::typeOnly()));
+			}
+			if (!$columnType->isSuperTypeOf($property->getReadableType())->yes()) {
+				$errors[] = sprintf('Property can contain %s but database expects %s.', $property->getReadableType()->describe(VerbosityLevel::typeOnly()), $columnType->describe(VerbosityLevel::typeOnly()));
+			}
+		}
+
+		return $errors;
+	}
+
+}

tests/Rules/Doctrine/ORM/EntityRelationRuleTest.php

@@ -0,0 +1,24 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Rules\Doctrine\ORM;
+
+use PHPStan\Rules\Rule;
+use PHPStan\Testing\RuleTestCase;
+use PHPStan\Type\Doctrine\ObjectMetadataResolver;
+
+class EntityRelationRuleTest extends RuleTestCase
+{
+
+	protected function getRule(): Rule
+	{
+		return new EntityRelationRule(
+			new ObjectMetadataResolver(__DIR__ . '/entity-manager.php', null)
+		);
+	}
+
+	public function testRule(): void
+	{
+		$this->analyse([__DIR__ . '/data/EntityWithRelations.php'], []);
+	}
+
+}

tests/Rules/Doctrine/ORM/data/AnotherEntity.php

@@ -0,0 +1,25 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Rules\Doctrine\ORM;
+
+use Doctrine\ORM\Mapping as ORM;
+
+/**
+ * @ORM\Entity()
+ */
+class AnotherEntity
+{
+
+	/**
+	 * @ORM\Id()
+	 * @ORM\Column(type="int")
+	 * @var int
+	 */
+	private $id;
+
+	/**
+	 * @ORM\ManyToOne(targetEntity="PHPStan\Rules\Doctrine\ORM\EntityWithRelations")
+	 */
+	private $manyToOne;
+
+}

tests/Rules/Doctrine/ORM/data/EntityWithRelations.php

@@ -0,0 +1,44 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Rules\Doctrine\ORM;
+
+use Doctrine\ORM\Mapping as ORM;
+
+/**
+ * @ORM\Entity()
+ */
+class EntityWithRelations
+{
+
+	/**
+	 * @ORM\Id()
+	 * @ORM\Column(type="int")
+	 * @var int
+	 */
+	private $id;
+
+	/**
+	 * @ORM\OneToOne(targetEntity="PHPStan\Rules\Doctrine\ORM\AnotherEntity")
+	 * @var \PHPStan\Rules\Doctrine\ORM\AnotherEntity|null
+	 */
+	private $oneToOne;
+
+	/**
+	 * @ORM\ManyToOne(targetEntity="PHPStan\Rules\Doctrine\ORM\AnotherEntity")
+	 * @var \PHPStan\Rules\Doctrine\ORM\AnotherEntity|null
+	 */
+	private $manyToOne;
+
+	/**
+	 * @ORM\OneToMany(targetEntity="PHPStan\Rules\Doctrine\ORM\AnotherEntity", mappedBy="manyToOne")
+	 * @var \Doctrine\Common\Collections\Collection&iterable<\PHPStan\Rules\Doctrine\ORM\AnotherEntity>
+	 */
+	private $oneToMany;
+
+	/**
+	 * @ORM\ManyToMany(targetEntity="PHPStan\Rules\Doctrine\ORM\AnotherEntity")
+	 * @var \Doctrine\Common\Collections\Collection&iterable<\PHPStan\Rules\Doctrine\ORM\AnotherEntity>
+	 */
+	private $manyToMany;
+
+}