AddPhone and DeletePhone Methods

We are adding two more methods to IPersonAppService interface as shown below:

Task DeletePhone(EntityDto<long> input);
Task<PhoneInPersonListDto> AddPhone(AddPhoneInput input);

We could create a new, separated IPhoneAppService. It's your choice. But, we can consider Person as an aggregate and add phone related methods here. AddPhoneInput DTO is shown below:

public class AddPhoneInput
{
    [Range(1, int.MaxValue)]
    public int PersonId { get; set; }

    [Required]
    public PhoneType Type { get; set; }

    [Required]
    [MaxLength(PhoneConsts.MaxNumberLength)]
    public string Number { get; set; }
}

Now, we can implement these methods:

public async Task DeletePhone(EntityDto<long> input)
{
    await _phoneRepository.DeleteAsync(input.Id);
}

public async Task<PhoneInPersonListDto> AddPhone(AddPhoneInput input)
{
    var person = _personRepository.Get(input.PersonId);
    await _personRepository.EnsureCollectionLoadedAsync(person, p => p.Phones);

    var phone = ObjectMapper.Map<Phone>(input);
    person.Phones.Add(phone);

    await CurrentUnitOfWork.SaveChangesAsync();

    return ObjectMapper.Map<PhoneInPersonListDto>(phone);
}

And create mapping in CustomDtoMapper.cs:

configuration.CreateMap<AddPhoneInput, Phone>();

(Note: We injected IRepository<Phone, long> in the constructor and set to _phoneRepository field)

DeletePhone method is simple. It only deletes phone with given id.

AddPhone method gets the person from the database and adds a new phone to the person's Phones collection. After that save changes is called. Saving changes causes inserting newly added phone to the database and getting back its Id. Because, we are returning a DTO that contains newly created phone's information (including the Id), it would be assigned before the mapping in the last line. (Note however that; it's not normally needed to call CurrentUnitOfWork.SaveChangesAsync since it is automatically called at the end of the method. We called it in the method bacause we need to save entity and get back its Id immediately. See UOW document for more.)

There may be different approaches for AddPhone method. You can directly work with a phone repository to insert new phone. They all have different pros and cons. It's your choice.

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