Dynamically property .Not.Insert().Not.Update() Mapping Fluent NHibernate

Question

im using the Fluent NHibernate together with the automapping functionality!

I'm currently using the follwing mapping statement to prevent autogenerated column values to be updated / insert

.Override<Entity>(map => map.Map(d => d.STATUS).Not.Insert().Not.Update())

It works fine so far, but now im looking for a way to get this solved more dynamically.

What i would like to do is:

I want to declare a custom attribute called [ReadOnlyDbField] and then declare all properties of the entity with this custom attribute to say: Just read this value and do not update / insert it.

Then i want to tell the mapping configuration:

Map all properties with the custom attribute [ReadOnlyDbField] to Not.Insert().Not.Update()

Is there a way to get this?

Thanks

Daniel

Answer 1

You must create an attribute class

public class NoInsertUpdateAttribute : Attribute
{

}

and another class for its convention:

public class NoInsertUpdateConvention : AttributePropertyConvention<NoInsertUpdateAttribute>
{
    protected override void Apply(NoInsertUpdateAttribute attribute, IPropertyInstance instance)
    {
        instance.Not.Insert();
        instance.Not.Update();
    }
}

and add container assembly of NoInsertUpdateConvention class to automap:

var fluentConfiguration = Fluently
            .Configure()
            .Mappings(
                m => {
                    var autoMap = AutoMap
                        .Conventions.AddFromAssemblyOf<NoInsertUpdateConvention>()
                }
            );

finally add attribute to property you do not want to be inserted or updated:

    [NoInsertUpdate]
    public virtual int? AccountID { get; set; }

Answer 2

Have a look at Generated method

Map(x => x.Status).Generated.Never(); // or Insert() or Always()

For auto application look at conventions, some examples here.