CODEWITHSUNDEEP
c#entity-framework-coreimplicit-conversion
Eloreden
Eloreden

Reputation: 1754

C# EFCore HasConversion to an object But EF Recognize Object Like an Entity

I have a question about HasConversion in EFCore. I decided to save in DB a model like a json String then I decided to implement automatic conversion of this Object with .HasConversion method in Configure Method of EFCore.

I have use this method in with Enum-> String and all run perfect but using this approach with object the situation become more complex:

I simplify scenario:

public class ObjectA 
{
    public string A {get; set;}
}

public partial class EntityA
{
    public ObjectA objectA {get; set;} //this is my json object in DB 
}

So I have a column in DB nvchar that i want to converto to ObjectA when I extract from DB. As EF core documentation say, i implemented a conversion class

    public void Configure(EntityTypeBuilder<EntityA> builder)
    {
        builder.Property(x => x.ObjectA)
            .HasConversion(y => JsonSerializer.Serialize(
                y,
                new JsonSerializerOptions()
            ),
            y => JsonSerializer.Deserialize<ItemList>(
                y,
                new JsonSerializerOptions()
            )
        );
    }

and when this mapper run all seams ok. But i use it in query for redeem object and convert it i have this error.

The entity type 'ObjectA' requires a primary key to be defined. If you intended to use a keyless entity type, call 'HasNoKey' in 'OnModelCreating'.

but ObjectA is not an Entity/Table so where is the problem?

I have same error even if i try to add-Merge theoretically EF should read conversion and it shouldn't automatically see the AbjectA as an entity but simply a string.

Sorry for my english i hope is all clear.

Tanx in advice

Upvotes: 0

Views: 1006

Answers (1)

Eloreden
Eloreden

Reputation: 1754

Sorry, after returning the project and fixing the code the error would show up again. I then understood that the error was due to the fact that I had added the same ObjectA object in a new model but I had not inserted the Mapper in the IEntityTypeConfiguration.

So my code is correct. Thank you all

Upvotes: 0

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