AutoMapper - Mapping View Model Collections?

Question

So I have a View Model like this:

Public Class CategoryViewModel Public Property ID As Integer Public Property Name As String Public Property Display As Boolean Public Property DisplayIndex As Integer End Class

And then this:

Public Class CategoriesViewModel Public Property Categories As IEnumerable(Of CategoryViewModel) End Class

How do I map a collection of categories (Domain.Category) to the Categories (CategoryViewModel) property in the CategoriesViewModel?

Also, how would you handle a collection of Sub Categories? Would you make another View Model for that and have a collection of those on the CategoryViewModel?

Derek Beattie · Accepted Answer · 2011-03-08 03:30:14Z

1

Just tell automapper how the types should map, so tell AM how Category maps to CategoryViewModel. AM doesn't care if you map an array of categories to a list of categoriesviewmodel as long as you tell it how to map the types.

For the second part are sub categories self referencing?

answered Mar 8, 2011 at 3:30

Derek Beattie

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7 Comments

Sam Over a year ago

@Derek - Self Referencing? Sorry, I am new to this, so what does that mean?

Derek Beattie Over a year ago

Does you Category class have a collection of Category.

Sam Over a year ago

@Derek - No, I have Categories that have Sub Categories.

Derek Beattie Over a year ago

So, no I wouldn't make another viewmodel for that. One suggestion name your view models based on what they do like CategoryDisplay or CategoryInput. So in your case my CategoryDisplay view model would have a collection of Category and Category would have a collection os SubCategory. In some cases your database model entities might be 1 to 1 mappings to your view model but that's ok. Check out ASP.NET MVC in Action 2, it's an excellent resource.

Sam Over a year ago

@Derek - So if you do not have a Model for each entity, then what do you use? The POCO classes? I was under the impression you did not want to use domain objects in your view/model, but rather a View Model per entity. - Thanks!

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