This is often used to determine if a fragment of a given type could possibly
be visited in a context of another type.
This function is commutative.
static public doTypesOverlap ( |
||
$schema | ||
$typeA | GraphQL\Type\Definition\CompositeType | |
$typeB | GraphQL\Type\Definition\CompositeType |
public function __invoke(ValidationContext $context) { return [NodeKind::INLINE_FRAGMENT => function (InlineFragmentNode $node) use($context) { $fragType = $context->getType(); $parentType = $context->getParentType(); if ($fragType && $parentType && !TypeInfo::doTypesOverlap($context->getSchema(), $fragType, $parentType)) { $context->reportError(new Error(self::typeIncompatibleAnonSpreadMessage($parentType, $fragType), [$node])); } }, NodeKind::FRAGMENT_SPREAD => function (FragmentSpreadNode $node) use($context) { $fragName = $node->name->value; $fragType = $this->getFragmentType($context, $fragName); $parentType = $context->getParentType(); if ($fragType && $parentType && !TypeInfo::doTypesOverlap($context->getSchema(), $fragType, $parentType)) { $context->reportError(new Error(self::typeIncompatibleSpreadMessage($fragName, $parentType, $fragType), [$node])); } }]; }