prs/prs.classes/Entities/Quote/QuoteDesign/QuoteDesignItem.cs

using InABox.Core;
using System.Linq;

namespace Comal.Classes
{
    [UserTracking(typeof(Quote))]
    public class QuoteDesignItem : Entity, IRemotable, IPersistent, ISequenceable, IManyToMany<QuoteDesign, QuoteTakeoff>,
        ILicense<QuotesManagementLicense>
    {
        [NullEditor]
        [EntityRelationship(DeleteAction.Cascade)]
        public QuoteDesignLink Design { get; set; }

        private class QuoteTakeoffLookup : LookupDefinitionGenerator<QuoteTakeoff, QuoteDesignItem>
        {
            public override Filter<QuoteTakeoff> DefineFilter(QuoteDesignItem[] items)
            {
                if (items == null || !items.Any())
                    return LookupFactory.DefineFilter<QuoteTakeoff>();
                return new Filter<QuoteTakeoff>(x => x.Quote.ID).IsEqualTo(items.First().Design.Quote.ID);
            }

            public override Columns<QuoteDesignItem> DefineFilterColumns()
                => new Columns<QuoteDesignItem>(x => x.Design.Quote.ID);
        }
        [LookupDefinition(typeof(QuoteTakeoffLookup))]
        [EntityRelationship(DeleteAction.Cascade)]
        public QuoteTakeoffLink Takeoff { get; set; }

        [EntityRelationship(DeleteAction.SetNull)]
        public QuoteDesignSectionLink Section { get; set; }

        [NullEditor]
        public long Sequence { get; set; }
    }
}