ListPersons.groovy

    List<Person> listPersons(PersonListCommand command) {
        List<Person> persons
        
        if (command.personIds && command.firstName && command.lastName) {
            persons = personRepository.findByIdInAndFirstNameAndLastName(command.personIds, command.firstName, command.lastName)
        } else if (command.personIds && command.firstName) {
            persons = personRepository.findByIdInAndFirstName(command.personIds, command.firstName)
        } else if (command.personIds && command.lastName) {
            persons = personRepository.findByIdInAndLastName(command.personIds, command.lastName)
        } else if (command.personIds) {
            persons = personRepository.findByIdIn(command.personIds)
        } else if (command.firstName && command.lastName) {
            persons = personRepository.findByFirstNameAndLastName(command.firstName, command.lastName)
        } else if (command.firstName) {
            persons = personRepository.findByFirstName(command.firstName)
        } else if (command.lastName) {
            persons = personRepository.findByLastName(command.lastName)
        } else {
            persons = []
        }
        
        return persons
   }