ValueInjecter Null Values

Question

I'am using ValueInjector(3.x) over AutoMapper but I have some questions.

First, I don't understand the difference between UnflatLoopInjection and FlatLoopInjection.

Also i want to set values in complex types.

Class Product {
   public string Id { get; set; } 
   public string Name { get; set; } 
   public Category Category { get; set; }
}

Class ProductDTO {
   public string Name { get; set; } 
   public Category Category { get; set; }
}

var product = repository.Get(id);
product.InjectFrom(dto);

The problem is my product.Category already have some properties with values and using InjectFrom the value injector replace the product.Category to dto.Category replacing the entire category even replacing to null.

Thanks

Answer 1

flattening is when you go from

Foo1.Foo2.Foo1.Name to Foo1Foo2Foo1Name

unflattening the other way around

I understand that you want to avoid injecting when the source property is Null

for this you can create an injections like this:

public class AvoidNullProps : LoopInjection
{
    protected override void SetValue(object source, object target, PropertyInfo sp, PropertyInfo tp)
    {
        var val = sp.GetValue(source);
        if(val != null)
        tp.SetValue(target, val);
    }
}

and use it res.InjectFrom<AvoidNullProps>(src);

---

you could also use the Mapper:

 Mapper.AddMap<ProductDTO, Product>(dto =>
            { 
                var res = new Product();
                res.Id = dto.Id;
                res.Name = dto.Name;
                if(dto.Category != null && dto.Category.Id != null) 
                   res.Category = Mapper.Map<Category>(dto.Category);

                return res;
            });

  var product = Mapper.Map<Product>(dto);