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Working on Cashier Checkout

Tanshu.Accounts.SqlDAO/Fluent/AllowNullConvention.cs

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+//using System;
+//using FluentNHibernate.Conventions;
+//using System.Reflection;
+//using FluentNHibernate;
+//using FluentNHibernate.Conventions.Instances;
+//using FluentNHibernate.Conventions.Inspections;
+//using FluentNHibernate.Conventions.AcceptanceCriteria;
+//using Tanshu.Accounts.Contracts;
+
+//namespace Tanshu.Accounts.Conventions
+//{
+//    public class AllowNullConvention : IPropertyConvention, IPropertyConventionAcceptance
+//    {
+//        public void Accept(IAcceptanceCriteria<IPropertyInspector> criteria)
+//        {
+//            criteria.Expect(
+//                x => !this.IsNullableProperty(x)
+//                || x.Property.MemberInfo.GetCustomAttributes(typeof(AllowNullAttribute), true).Length > 0);
+//        }
+
+//        public void Apply(IPropertyInstance instance)
+//        {
+//            instance.Nullable();
+//        }
+
+//        private bool IsNullableProperty(IExposedThroughPropertyInspector target)
+//        {
+//            var type = target.Property.PropertyType;
+
+//            return type.Equals(typeof(string)) || (type.IsGenericType && type.GetGenericTypeDefinition().Equals(typeof(Nullable<>)));
+//        }
+//    }
+//}