// Using this throws: "extensions": {
// "message": "Value cannot be null. (Parameter 'source')",
// "stackTrace": " at System.Linq.Queryable.Select[TSource,TResult](IQueryable`1 source, Expression`1 selector)\r\n at HotChocolate.Types.Selections.SelectionMiddleware`1.InvokeAsync(IMiddlewareContext context)\r\n at HotChocolate.Execution.ExecutionStrategyBase.ExecuteMiddlewareAsync(ResolverContext resolverContext, IErrorHandler errorHandler)"
// }
// Reomving it I can query for the studen properties, but not get courses
public async Task <Student> OnNewStudent([EventMessage] int studentId,
[Service] Context context)
{
return(await context.Students.FindAsync(studentId));
}
public IQueryable <Student> GetStudents([Service] Context context) => context.Students;