src/Validator/Rules/FieldsOnCorrectType.php
public static function undefinedFieldMessage(
        $fieldName,
        $type,
        array $suggestedTypeNames,
        array $suggestedFieldNames
    ) {
        $message = sprintf('Cannot query field "%s" on type "%s".', $fieldName, $type);

        if ($suggestedTypeNames) {
            $suggestions = Utils::quotedOrList($suggestedTypeNames);

            $message .= sprintf(' Did you mean to use an inline fragment on %s?', $suggestions);
        } elseif (! empty($suggestedFieldNames)) {
            $suggestions = Utils::quotedOrList($suggestedFieldNames);

            $message .= sprintf(' Did you mean %s?', $suggestions);
        }

        return $message;
    }
public static function undefinedFieldMessage(
        $fieldName,
        $type,
        array $suggestedTypeNames,
        array $suggestedFieldNames
    ) {
        $message = sprintf('Cannot query field "%s" on type "%s".', $fieldName, $type);

        if ($suggestedTypeNames) {
            $suggestions = Utils::quotedOrList($suggestedTypeNames);

            $message .= sprintf(' Did you mean to use an inline fragment on %s?', $suggestions);
        } elseif (! empty($suggestedFieldNames)) {
            $suggestions = Utils::quotedOrList($suggestedFieldNames);

            $message .= sprintf(' Did you mean %s?', $suggestions);
        }

        return $message;
    }
@param string   $fieldName
@param string   $type
@param string[] $suggestedTypeNames
@param string[] $suggestedFieldNames

@return string