Automapper Parent Child Mapping sets Grandchildren Properties as null - recursion

Question

Automapper seems to be ignoring grandchild objects when mapping between objects. So that i only get 2 levels of recursion. I need at least 3, ideally n levels.
How do I get Automapper to return the correct object with all children intact?
I can work around it, by serializing my DbPOCO and deserializing to the Dto, but that means crossing concerns in my application, and/or doing something different for this specific method which I don't like.
Given my DB Poco
public class Menu : SqlTable, IParentChild<Menu>
{
public string Label {get; set;}
public string Route {get; set;}
public float Sequence { get; set; }
public int? ParentID {get; set;}
public Menu Parent {get; set;}
public IList<Menu> Children { get; set; }
}
I can return (with some recursive magic) an object which serializes like this, but it includes (removed) database audit columns and other table generic items that I don't want communicated over my API.
[
{
"Label": "Main Menu 1",
"Route": "",
"Sequence": 1,
"ParentID": null,
"Parent": null,
"Children": [
{
"Label": "Menu 1 Sub 1",
"Route": "",
"Sequence": 1,
"ParentID": 1,
"Parent": null,
"Children": [
{
"Label": "Menu 1 Sub 1 Sub 1",
"Route": "",
"Sequence": 1,
"ParentID": 2,
"Parent": null,
"Children": [],
...
},
{
"Label": "Menu 1 Sub 1 Sub 2",
"Route": "",
"Sequence": 2,
"ParentID": 2,
"Parent": null,
"Children": [],
...
}
],
...
},
{
"Label": "Menu 1 Sub 2",
"Route": "",
"Sequence": 2,
"ParentID": 1,
"Parent": null,
"Children": [],
"ID": 5,
...
}
],
...
},
{
"Label": "Main Menu 2",
"Route": "",
"Sequence": 2,
"ParentID": null,
"Parent": null,
"Children": [
{
"Label": "Menu 2 Sub 1",
"Route": "",
"Sequence": 1,
"ParentID": 6,
"Parent": null,
"Children": [],
...
}
],
...
}
]
When i pass this into Automapper, to map it to the following DTO
public class WebApplicationMenuModel
{
public string Label { get; set; }
public string Route { get; set; }
public float Sequence { get; set; }
public IEnumerable<WebApplicationMenuModel> Children { get; set; }
}
The grandchildren from my original object are set to null
[
{
"Label": "Main Menu 1",
"Route": "",
"Sequence": 1,
"Children": [
{
"Label": "Menu 1 Sub 1",
"Route": "",
"Sequence": 1,
"Children": null
},
{
"Label": "Menu 1 Sub 2",
"Route": "",
"Sequence": 2,
"Children": null
}
]
},
{
"Label": "Main Menu 2",
"Route": "",
"Sequence": 2,
"Children": [
{
"Label": "Menu 2 Sub 1",
"Route": "",
"Sequence": 1,
"Children": null
}
]
}
]
The map profile is fairly basic
public class MenuProfile : Profile
{
public MenuProfile()
{
CreateMap<Menu, WebApplicationMenuModel>()
.ReverseMap();
}
}

Answer 1

See Reply by Lucian Bargaoanu. Needed to user the master Automapper branch (9.1.0-ci-01627) to support this from MyGet.
https://docs.automapper.org/en/stable/The-MyGet-build.html