Fluent NHibernate: Applying attribute to all members of a property mapped via a Component?

Following up, I did not find a way to directly implement what I described. I could see it being difficult or impossible to implement such a thing based on how attributes work in C#.

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I am using Fluent NHibernate (1.2), and am working on implementing column-level encryption. I have a custom type that handles encryption, so that the domain model can have native cleartext datatypes (simple strings, ints, DateTimes, etc.), and all the encryption/decryption work is behind the scenes. I would like to specify which properties in each domain model to encrypt via an attribute, and use a Convention to specify the custom type for these properties, so that the domain models are nice POCOs with no mention of the custom type: public class EncryptedAttribute : Attribute {} public class UserRecord { public virtual Guid Id { get; set; } public virtual string Username { get; set; } Encrypted public virtual string EmailAddress { get; set; } Encrypted public virtual DateTime DateOfBirth { get; set; } Encrypted public virtual PersonName LegalName { get; set; } // etc. } public class PersonName { public virtual string Given { get; set; } public virtual string Middle { get; set; } public virtual string Family { get; set; } } public class EncryptedColumnConvention : AttributePropertyConvention { protected override void Apply( EncryptedAttribute attribute, IPropertyInstance instance) { var dbType = typeof(EncryptedColumnType).

MakeGenericType(domainType); instance. CustomType(dbType); } } public class UserRecordMap : ClassMap { public UserRecordMap() { Id(o => o. Id); Map(o => o.

Username); Map(o => o. EmailAddress); Map(o => o. DateOfBirth); Component(o => o.

LegalName). ColumnPrefix("LegalName"); // etc. } } public class PersonNameMap : ComponentMap // etc. As shown above, I am trying to tie this all together with an AttributePropertyConvention. This works well for simple properties, e.g. EmailAddress will get a custom type of EncryptedColumnType.

But it is not working for properties which are complex types (e.g. LegalName) that are mapped via Components. What I want is to encrypt every property of LegalName because I decorated it with Encrypted. In other words, I want the UserRecord db table to have three encrypted name fields--given, middle, and family.

It seems that the AttributePropertyConvention is just not getting applied at all to the LegalName or any of its member properties. Perhaps I need to use another type of Convention to handle this case? I know I can just decorate the individual properties within PersonName with Encrypted, instead of decorating the LegalName property within UserRecord.

I tested this and it works fine. I can fall back to this approach if necessary, but am interested in trying to get the approach outline above to work instead. Nhibernate fluent-nhibernate nhibernate-mapping link|improve this question asked Aug 10 '11 at 16:55esker95013 100% accept rate.

Following up, I did not find a way to directly implement what I described. I could see it being difficult or impossible to implement such a thing based on how attributes work in C#. Instead, I just added the Encrypted attribute to each property of the PersonName class, and let those PersonName columns in the resulting database table always be encrypted.

In the future, if I do need to map PersonName as a non-encrypted "component" of another entity, I could perhaps decorate the non-encrypted class with an attribute that disables encryption for all of its mapped columns/components, overriding any Encrypted attributes found in that class's property/component mappings.

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