public static function noInputTypesAsOutputFieldsRule()
{
return function ($context) {
$operationMayNotBeInputType = function (Type $type, $operation) {
if (!Type::isOutputType($type)) {
return new Error("Schema {$operation} must be Object Type but got: {$type}.");
}
return null;
};
/** @var Schema $schema */
$schema = $context['schema'];
$typeMap = $schema->getTypeMap();
$errors = [];
$queryType = $schema->getQueryType();
if ($queryType) {
$queryError = $operationMayNotBeInputType($queryType, 'query');
if ($queryError !== null) {
$errors[] = $queryError;
}
}
$mutationType = $schema->getMutationType();
if ($mutationType) {
$mutationError = $operationMayNotBeInputType($mutationType, 'mutation');
if ($mutationError !== null) {
$errors[] = $mutationError;
}
}
$subscriptionType = $schema->getSubscriptionType();
if ($subscriptionType) {
$subscriptionError = $operationMayNotBeInputType($subscriptionType, 'subscription');
if ($subscriptionError !== null) {
$errors[] = $subscriptionError;
}
}
foreach ($typeMap as $typeName => $type) {
if ($type instanceof ObjectType || $type instanceof InterfaceType) {
$fields = $type->getFields();
foreach ($fields as $fieldName => $field) {
if ($field->getType() instanceof InputObjectType) {
$errors[] = new Error("Field {$typeName}.{$field->name} is of type " . "{$field->getType()->name}, which is an input type, but field types " . "must be output types!");
}
}
}
}
return !empty($errors) ? $errors : null;
};
}