To get the example to work I actually had to do this:

cfg.AddAssemblyResources?(Assembly.GetExecutingAssembly?(), "otis.xml");

That is needed when mappings are defined as XML resource files. If they are defined via attributes, cfg.AddAssembly?(Assembly.GetExecutingAssembly?()) is fine. Thanks for the info, i will update the documentation.

I cannot make this work. I keep getting - error CS0528: 'IAssembler<...>' is already listed in interface list

What exactly are you trying to do? XML or attribute mapping? This sounds like you defined same mapping twice (i.e. you have two definitions of mapping from class X to class Y). You can also check the sample application from the source distribution on download page.

My problem seems to slightly different. My entity class implements two interfaces (from different assembly)

Are you using 0.2 or 0.2.17? do you get this message during compilation or during otis configuration setup? can you send me the full error message?

Ok, i used xml configuration, but i still cannot make it work. The problem is that assembler cannot find interfaces that entity class implements. Is there any chance to solve it? Thanks for any help!

I sent you an email with more or less detailed info

Hello Zdeslav, I have one question. We are getting null reference exception during transformation , when source object contains null fields. is there an easy way to handle such situation. Thanks!

Details - one of String fields is null which is ok from app point of view.

hi Maciej,

As you might have seen, there is a NullValue? attribute, but due to a bug it is not used in generated mapping code. Additionally, better null value handling is one of the topics for new release. I plan to upload a patch for NullValue? bug tonight or tomorrow evening. I believe that this should solve your problem. New version is delayed due to a bunch of unexpected events, but I will try to release it in next two weeks.

Thanks Zdeslav, Appreciate!

Is it possible to case a collection of UserDTO to a collection of UserEntity??

It works for lists and array. You can do list <-> list, array <-> array and list <-> array conversions. Besides, IAssembler interface provides methods ToArray?() and ToList?() if your collection is not a member of a class but a collection instead. Please have a look at unit tests (CollectionMappingTest?.cs, last two tests in EntityMappingTest?.cs)

It doesn't seem to support inheritance. What would I do if my source or target (or both) class inherits from a base class? Could you provide an example?

I am not sure I understand fully. You can just map them normally (see InheritanceMappingTests?.cs in Otis.Tests project). Can you provide more info?

Please disregard my last question. I got the scenario wrong. Here's the question: Suppose NamedEntity? has a property that is another class,

public class NamedEntity? : Entity {

.... public AnotherClass? Anc {get; set;} ...

public class AnotherClass? {

public string id {get; set;}

So now if I want to map AnotherCompany?'s Name property to Company.Anc.id how would I do it?

Currently it is more complicated than it should be. Have a look at MappingNestedTargets topic in wiki. There is a proposal for simpler handling of such cases at NestedObjectMapping, but it is not implemented yet.

I understand the concept of projections but they seem like mapping from strings or integers to enum. How would I map from one enum type to another?

something like this (let's say UserGender? is an enum):

<member name="Gender" expression="$UserGender">
	<map from="MyNamespace.Gender.Male" to="Male" />
	<map from="MyNamespace.Gender.Female" to="Female" />
</member>

Please make sure that you enter the full name (including namespace) in 'from' attribute. This is a bug in current version.

Here's a full sample:

namespace Otis.Tests
{
	public enum E1
	{
		first, 
		last
	}
	public enum E2
	{
		start,
		stop
	}

	public class CL1
	{
		public E1 e1;
	}

	[MapClass(typeof(CL1))]
	public class CL2
	{
		[Map("$e1", Projection = "Otis.Tests.E1.first => start; Otis.Tests.E1.last => stop")]
		public E2 e2;
	}

	[TestFixture]
	public class IntegrationTests
	{
		[Test]
		public void Enums()
		{
			Configuration cfg = new Configuration();
			cfg.AddType<CL2>();
			IAssembler<CL2, CL1> asm = cfg.GetAssembler<CL2, CL1>();
			CL1 cl1 = new CL1();
			cl1.e1 = E1.last;

			CL2 cl = asm.AssembleFrom(cl1);
			Assert.AreEqual(E2.stop, cl.e2);			
		}
  }
}

Thanks for your reply. I've figured out how to do enum mapping. Here's another challenge of mine: I need to map from a DateTime?? type to a list of a custom type (DateType?)?

public partial class DateType?? : SomeBaseType? {

private List<object> itemsField;

public List<object> Items {

get {

if (itemsField == null) itemsField = new List<object>(); return this.itemsField;

} set {

this.itemsField = value;

}

}

public DateType?? (System.DateTime?? value) {

Items.Add(new date { Value = value } );

}

public DateType?? (System.DateTime??) {

Items.Add(new date { Value = ( System.DateTime?? )value } );

}

}

How would I map from my source (System.DateTime??) to my target, which is a List of DateType? (List<DateType>)?

Thanks.

You can't do this just with mapping. The closest you can get is by using @helper@. Search for 'helper' in wiki topics [XmlMappings?] and [MetadataMappings?]. There are also examples in unit test.