Projections and "calculated" field

[parvic1]

I am trying to map a property in OrderLineView named IsEditable, which is not in the OrderLine class. I need IsEditable to be calculated when the projection is done.

public IQueryable<OrderLineView> GetOrderLinesByOrderId(long orderId)
{
    var query = context.OrderLines.Include(x => x.Order)
        .AsNoTracking()
        .Where(ol => ol.OrderId == orderId)
        .ProjectToOrderLineView();

    return query;
}

[Mapper]
internal static partial class OrderLineQueryMapper
{
public static partial IQueryable ProjectToOrderLineView(this IQueryable source);

[MapProperty(nameof(OrderLine), nameof(OrderLineView.IsEditable), Use = nameof(MapIsEditable))]
private static bool MapIsEditable(OrderLine source) => source.Order?.Invoiced == false 
    && (source.OnHoldIndicator == false || source.OnHoldIndicator == null) 
    && source.ErrorIndicator == false;

}

[parvic1]

[Mapper]
internal static partial class OrderLineQueryMapper
{
public static partial IQueryable ProjectToOrderLineView(this IQueryable source);

[MapProperty(nameof(OrderLine), nameof(OrderLineView.IsEditable), Use = nameof(MapIsEditable))]
public static partial OrderLineView MapOrderLine(OrderLine orderline);

private static bool MapIsEditable(OrderLine source) => source.Order?.Invoiced == false 
    && (source.OnHoldIndicator == false || source.OnHoldIndicator == null) 
    && source.ErrorIndicator == false;

}

[latonz]

Have you tried MapPropertyFromSource?