How can we create different mapping for same entity in automapper

Question

I need to write mapping for an entity to its DTO for listing purpose and details view of an entity. But for listing I need to ignore a list property because of DTO because I don't want to load it, I have enabled Lazy loading in Entity framework. How can I create two mappings of same entity or add ignore for a property while querying data for list view.

cfg.CreateMap<page, PageViewModel>().ForMember(t => t.PageRows, opts => opts.MapFrom(s => s.page_rows)).
            ForMember(t => t.PageRules, opts => opts.MapFrom(s => s.page_rules.Select(x => x.rule_id)));

cfg.CreateMap<page, PageViewModel>().ForMember(t => t.PageRows, opts => opts.Ignore()).
            ForMember(t => t.PageRules, opts => opts.MapFrom(s => s.page_rules.Select(x => x.rule_id)));

I was checking whether I can avoid a duplicate class creation — Dileep Paul
– Dileep Paul, Commented Feb 17, 2017 at 19:16
What AM method are you using for mapping? e.g. Map, ProjectTo etc.? — Ivan Stoev
– Ivan Stoev, Commented Feb 17, 2017 at 19:17

Ivan Stoev · Accepted Answer · 2017-02-18 04:22:12Z

2

You can setup a Precondition with Func<ResolutionContext, bool> and then use the Map method overloads with Action<IMappingOperationOptions> to pass the controlling parameter through Items dictionary.

For instance:

.ForMember(t => t.PageRows, opts => 
{
     opts.MapFrom(s => s.page_rows);
     opts.PreCondition(context => !context.Items.ContainsKey("IgnorePageRows"));
})

and then:

IEnumerable<page> source = ...;
var withPageRows = Mapper.Map<List<PageViewModel>>(source);
var noPageRows = Mapper.Map<List<PageViewModel>>(source, 
    opts => opts.Items.Add("IgnorePageRows", null));

Reference: Conditional mapping

edited Feb 18, 2017 at 4:22

answered Feb 17, 2017 at 20:05

Ivan Stoev

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Comments

Stout01 · Accepted Answer · 2017-02-17 19:36:47Z

1

You would have to create two different DTO classes to map to. If you do not want to do that, you also have another option which would be to create two marker interfaces and map to those.

edited Feb 17, 2017 at 19:36

answered Feb 17, 2017 at 19:30

Stout01

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