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POAutoMapper Map properties of nested objects if Not Null
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  1. POAutoMapper Map properties of nested objects if Not Null
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    copied!<p>I have the following sample objects..</p> <pre><code> public class ComplexObject { public string Name { get; set; } public SimpleObject Child1 { get; set; } public SimpleObject Child2 { get; set; } } public class SimpleObject : IEquatable&lt; SimpleObject &gt; { public string FirstName { get; set; } public string LastName { get; set; } public string Gender { get; set; } public int? Age { get; set; } } </code></pre> <p>with the following AutoMapper configuration</p> <pre><code> Mapper.CreateMap&lt;SimpleObject, SimpleObject&gt;() .ForAllMembers(expression=&gt;expression.Condition(r=&gt;!r.IsSourceValueNull)); Mapper.CreateMap&lt;ComplexObject, ComplexObject&gt;() .ForAllMembers(expression=&gt;expression.Condition(resolutionContext=&gt;!resolutionContext.IsSourceValueNull)); </code></pre> <p>and the following NUnit test...</p> <pre><code>[SetUp] public void Should_run_before_each_test() { child1 = new SimpleObject { FirstName = "Tom", LastName = "Smith", Age = 34, Gender = "Male" }; child2 = new SimpleObject { FirstName = "Andy", LastName = "Smith-bob", Age = 21, Gender = "Male" }; } [ Test ] public void Should_ignore_null_properties_in_nested_objects() { var source = new ComplexObject() { Name = "blue", Child1 = new SimpleObject{FirstName = "dot", LastName = "net"} }; var destination = new ComplexObject() { Name = "Andy", Child1 = child1, Child2 = child2 }; destination = Mapper.Map(source, destination); destination.Name.Should(Be.EqualTo(source.Name)); destination.Child1.FirstName.Should(Be.EqualTo("dot")); destination.Child1.LastName.Should(Be.EqualTo("net") ); destination.Child1.Age.Should(Be.EqualTo(child1.Age) ); destination.Child1.Gender.Should(Be.EqualTo(child1.Gender) ); } </code></pre> <p>The above test fails when asserting the age as AutoMapper is pushing null through to the destination object.</p> <p>Am I expecting too much from AutoMapper, or have I missed some vital map configuration step.</p> <p>The ultimate goal is to have a very complex domain object bound to incoming form data via an MVC action. AutoMapper will then be used to merge only non-null properties (at all depths of the object graph) into the real instance being maintained throughout a multi step form.</p> <p>Just in case anyone needs to know... I have also tried the following mapping configuration without any luck :(</p> <pre><code> Mapper.CreateMap&lt;ComplexObject, ComplexObject&gt;() .ForMember(x=&gt;x.Child1, l=&gt;l.ResolveUsing(x=&gt;x.Child1 == null?null:Mapper.Map&lt;SimpleObject,SimpleObject&gt;(x.Child1))) .ForMember(x=&gt;x.Child2, l=&gt;l.ResolveUsing(x=&gt;x.Child2 == null?null:Mapper.Map&lt;SimpleObject,SimpleObject&gt;(x.Child2))) .ForAllMembers(expression=&gt;expression.Condition(resolutionContext=&gt;!resolutionContext.IsSourceValueNull)); </code></pre>
 

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