CarbonFootprintVariantGraphType.cs

public class CarbonFootprintVariantGraphType: ObjectGraphType<Variant>
{
    public CarbonFootprintVariantGraphType()
    {
        Name = "CarbonFootprintItemVariant";
        Field<NonNullGraphType<IntGraphType>>(
            "id",
            resolve: context => context.Source.Id
        );
        Field<NonNullGraphType<StringGraphType>>(
            "name",
            resolve: context => context.Source.VariantName
        );

        Field<NonNullGraphType<CarbonFootprintItemGraphType>>(
            "item",
            resolve: context => ApplicationContext.Current.DatabaseContext.GetItemById(context.Source.Item)
        );

        Field<NonNullGraphType<FloatGraphType>>(
            "carbonDioxideEquivalentInGrams",
            resolve: context => context.Source.CarbonDioxideEquivalent
        );
    }
}