"Unexpected execution error" on Custom objects

Describe the bug I’m trying to setup a very simple test console application, where my Query object, have a User field, which return a User type object.

To Reproduce In a basic .Net Core console application, use the code below

class Program
{
    static void Main(string[] args)
    {
        var schema = Schema.Create(c =>
        {
            c.RegisterType<ObjectType<Query>>();
            c.RegisterType<ObjectType<User>>();
        });

        Console.WriteLine(schema.Execute("query UserQuery { user() }"));

        Console.ReadLine();
    }
}

public class Query
{
    public User User() => new User { Name = "Username" };
}

public class User
{
    public string Name { get; set; }
}

On run, this will prompt:

 {
   "errors": [
     {
       "Message": "Unexpected execution error."
     }
   ]
 }

Expected behavior

 {
   "data": {
     "user": {
        "name": "Username"
      }
   }
 }

Or at least a comprehensive error, explaining what is going wrong.

Desktop:

• Windows 10
• HotChocolate 0.4.0
• .Net Core 2.1

Additional context If I use this code, it works:

class Program
{
    static void Main(string[] args)
    {
        var schema = Schema.Create(c =>
        {
            c.RegisterType<ObjectType<Query>>();
            c.RegisterType<ObjectType<User>>();
        });

        Console.WriteLine(schema.Execute("query UserQuery { user() }"));

        Console.ReadLine();
    }
}

public class Query
{
    //public User User() => new User { Name = "Username" };
    public string User() => "Username";
}

public class User
{
    public string Name { get; set; }
}

Output:

{
  "data": {
    "user": "Username"
  }
}

[glucaci]

Hi @jbuiss0n ,

You should register your query with:

c.RegisterQueryType<Query>();

You can use your User object also but the query should look like this:

schema.Execute("query UserQuery { user { name } }")
// or
schema.Execute("{ user { name } }")

On your second example only with a string and not a User object, you can simplify your query:

schema.Execute("query UserQuery { user }")
// or
schema.Execute("{ user }")

I don’t know if it’s possible and how, to request for the whole user, without setting any property.

It’s not possible, by design GraphQL is giving you back only what you request.

[jbuiss0n]

Thanks for the information! I’m looking forward to try this then.