OData complains about missing id property when enabling camelcasing - asp.net-web-api

Question

I want to enable camel casing of my odata results. So I added EnableLowerCamelCase. But after I enabled that I get the following error message when I call:
http://localhost/odata/Users
The EDM instance of type '[Core.DomainModel.User Nullable=True]' is
missing the property 'id'.
Everything worked before I EnableLowerCamelCase, and it works again if I remove it. Also the error message is rather confusing. It says that User is missing the 'id' property. Which cannot be true. Because I have 'Id' defined as the key.
var builder = new ODataConventionModelBuilder();
builder.EnableLowerCamelCase();
var users = builder.EntitySet<User>(nameof(UsersController).Replace("Controller", string.Empty));
users.EntityType.HasKey(x => x.Id); // <--- id property
builder.GetEdmModel();
What am I doing wrong?

Answer 1

The way I solved this was to remove the entity key declaration from the EDM Model and to specifying it in the model itself
So my edm looks like `
var builder = new ODataConventionModelBuilder(serviceProvider);
builder.EnableLowerCamelCase();
var subscriptionSet = builder.EntitySet<SubscriptionDTO>("Subscriptions");
subscriptionSet.EntityType
.Filter() // Allow for the $filter Command
.Count() // Allow for the $count Command
.Expand() // Allow for the $expand Command
.OrderBy() // Allow for the $orderby Command
.Page() // Allow for the $top and $skip Commands
.Select(); // Allow for the $select Command
// subscriptionSet.EntityType.HasKey(s => s.Id);
//subscriptionSet.EntityType.EntityType.Property(s => s.Id).IsOptional();`
In the model use DataAnnotations to identify the key:
public class BaseModel
{
[Key]
public Guid? Id {get; set;}
public Guid? TenantId {get; set;}
public string Type {get; set;}
public bool Active {get; set;} = true;
public BaseModel() {
this.Id = System.Guid.NewGuid();
}
then use DTOs with Automapper as per convention:
[JsonObject(NamingStrategyType = typeof(CamelCaseNamingStrategy))]
public class BaseDTO
{
public Guid? Id {get; set;}
public Guid? TenantId {get; set;}
public string Type {get; set;}
public bool Active {get; set;} = true;
public BaseDTO() {
this.Id = System.Guid.NewGuid();
}
}
[JsonObject(NamingStrategyType = typeof(CamelCaseNamingStrategy))]
public class SubscriptionDTO: BaseDTO
{
[JsonProperty("email")]
public string Email {get; set;}
public SubscriptionDTO(): base() {
this.Type = "subscription";
}
}