I just followed this guide to install and set up AutoMapper, and I think I got it correctly set up. But when I try to map from IEnumerable<ProductCategory> to IEnumerable<ViewModelProductCategory>, like this:
var categories = _context.ProductCategories.Include(e => e.Children).ToList();
var topLevelCategories = categories.Where(e => e.ParentId == null);
var VMCategory = _mapper
.Map<IEnumerable<ProductCategory>,
IEnumerable<ViewModelProductCategory>>(topLevelCategories);
return View(VMCategory);
(Thank you to @Anton Gorbunov, for pointing out that I had my objects swapped!)
... my view complains about receiving the wrong model. I'm pretty sure it's because of the children categories not being mapped to a sub-list, so in the view, item.Children is not properly set up as a viewmodel.
How can I map a list of lists?
This is my Index-view:
@model IEnumerable<MyStore.Models.ViewModels.ViewModelProductCategory>
<ul>
@Html.Partial("_CategoryRecursive", Model)
</ul>
... and this is _CategoryRecursive.cshtml:
@model IEnumerable<MyStore.Models.ViewModels.ViewModelProductCategory>
<ul style="list-style:none;padding-left:0px;">
@if (Model != null)
{
foreach (var item in Model)
{
<li style="margin:8px 0px 0px 0px;">
<ul>
@Html.Partial("_CategoryRecursive.cshtml", item.Children)
</ul>
</li>
}
}
</ul>
Mapping profile:
public class MappingProfile : Profile
{
public MappingProfile()
{
CreateMap<ProductCategory, ViewModelProductCategory>();
CreateMap<ViewModelProductCategory, ProductCategory>();
CreateMap<Product, ViewModelProduct>();
CreateMap<ViewModelProduct, Product>();
}
}
Entity model:
public class ProductCategory
{
public int Id { get; set; }
public int SortOrder { get; set; }
public string Title { get; set; }
[ForeignKey(nameof(ParentCategory))]
public int? ParentId { get; set; }
public ProductCategory ParentCategory { get; set; } //nav.prop to parent
public ICollection<ProductCategory> Children { get; set; } //nav. prop to children
public List<ProductInCategory> ProductInCategory { get; set; }
}
Viewmodel:
public class ViewModelProductCategory
{
public int Id { get; set; }
public int? ParentId { get; set; }
public string Title { get; set; }
public int SortOrder { get; set; }
public string ProductCountInfo
{
get
{
return Products != null && Products.Any() ? Products.Count().ToString() : "0";
}
}
public ProductCategory ParentCategory { get; set; } // Nav.prop. to parent
public IEnumerable<ProductCategory> Children { get; set; } // Nav.prop. to children
public List<ViewModelProduct> Products { get; set; } // Products in this category
public List<ViewModelProduct> OrphanProducts { get; set; } // Products with no references in ProductInCategory
}
