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Why projection is not including navigation nested properties in EF Core 2.0?


Why projection is not including navigation nested properties in EF Core 2.0?

By : user2172740
Date : October 22 2020, 08:10 PM
I hope this helps .
Include doesn't work with projection queries. Once you start projecting (Select), you need to continue with Select all the way down.
code :
var myModels = _dbContext.Models.Include(x => x.Nested).ThenInclude(n => n.FurtherNested).Select(x => new
            {
                Name = x.Name,
                Nested = x.Nested.Select(n => new
                {
                    FurtherNestedId = n.FurtherNestedId,
                    FurtherNested = n.FurtherNested
                })

            }).ToList();


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WCF Data Services query projection with nullable navigation properties

WCF Data Services query projection with nullable navigation properties


By : arnisli
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , to a co-worker who pointed out that the linked blog was returning null instead of a constant when the navigation property was null!
If you change the above code to return null/Nothing when the navigation property is null, it works in C# and VB.NET!
code :
Select
    CSM = If(t.WrittenByEmployee IsNot Nothing, t.WrittenByEmployee.Name, Nothing)
                                                                          ^^^^^^^
breeze projection : error selecting non scalar navigation properties

breeze projection : error selecting non scalar navigation properties


By : jeff
Date : March 29 2020, 07:55 AM
this one helps. I believe you are trying to build a query that EF doesn't support (and that OData query syntax doesn't support either).
Your FK_Udc_Dettaglio_Articoli is a collection navigation property of Articoli. By trying to go after just the Id_Udc property of each element in that collection, you are actually trying to create a projection within a projection ... and EF doesn't support that as far as I know.
code :
dbContext.Articoli.Select(
    a => new {a.Codice, a.FK_Udc_Dettaglio_Articoli.Select(f => new {f.Id_Udc}));
EntityFramework Core including multilevel navigation properties in results

EntityFramework Core including multilevel navigation properties in results


By : Olu
Date : March 29 2020, 07:55 AM
wish of those help You can repeat identical Includes as often as you like (and deem sensible):
code :
 var blogs = context.Blogs
     .Include(blog => blog.Posts)
        .ThenInclude(post => post.Author)
        .ThenInclude(author => author.Photo)
     .Include(blog => blog.Posts)
        .ThenInclude(post => post.Document)
     .Include(blog => blog.Posts)
        .ThenInclude(post => post. ...)
Entity Framework Core 3.0 performance impact for including collection navigation properties (cartesian explosion)

Entity Framework Core 3.0 performance impact for including collection navigation properties (cartesian explosion)


By : user3462178
Date : March 29 2020, 07:55 AM
This might help you As per the update of my initial question, the insights went so far as to assure myself that currenty, there is in fact no built in configuration to return to split query execution.
However, MS provided code samples on how to do this with minimal code changes (for our use case!) here.
code :
...
var myQueryable = this._context.Items.Where(**some filter**);
... // moar filters
var result = myQueryable.ToList();
...
var addInfos = myQueryable.Include(x => x.AddInfos).SelectMany(x => x.AddInfos).Select(x => new {x.ItemID, x}).ToList();
Nhibernate Projection over nested nested properties

Nhibernate Projection over nested nested properties


By : tom udelson
Date : March 29 2020, 07:55 AM
hop of those help? I have domain class location , Use CreateAlias instead:
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