Ability to ignore source fields

[mikart143]

I am not able to find any config which could help with my problem. I want to update object but i don't want to update target fields with null fields from source. I want to ignore source fields if they are null.

[SteveWilkes]

Hi!

There's no quick way to achieve this, but it seems like a sensible thing to support, so I'll add it in. It's not going to be quick to add though, but thanks for the suggestion!

Cheers,

Steve

[SteveWilkes]

Implemention underway on this branch :)

[SteveWilkes]

Well - I said it wouldn't be quick!

This is supported as of v1.5, which is now on NuGet. Sources can be ignored like this:

Mapper.WhenMapping
    .Over<Order>()                    // Apply the filter to Order updates
    .IgnoreSources(c => c
        .If<string>(s => s == null)); // Ignore null source strings

Mapper.WhenMapping
    .From<OrderDto>()             // Apply when mapping from OrderDto
    .Over<Order>()                // Apply the ignore to Order updates (optional)
    .IgnoreSource(dto => dto.Id); // Ignore the Order.Id property

...or like this:

// Source, target and mapping types are implicit from the mapping:
Mapper.Map(orderDto).Over(order, cfg => cfg
    .If((dto, o) => dto.Id == 0) // Apply the ignores if OrderDto.Id is 0
    .IgnoreSource(
        dto => dto.Id,           // Ignore Order.Id...
        dto => dto.OrderNumber); // ...and Order.OrderNumber

...or like this:

Mapper.WhenMapping
    .IgnoreSourceMembersOfType<IDontMapMe>();

...and in other ways!

Thanks again for the suggestion :)