Lazy-loaded NHibernate properties in Equals and GetHashCode

Question

How can the following problem be dealt with?

We\'re using lazy loaded NHibernate properties and whenever we\'re calling Equals() or GetHashCode()<

Answer 1

I use the following rules:

1. If entity has a POID property (remember that there is not need of property or any member just omit the name="XX", not sure if activerecord or the mapping strategy you are using supoprt this)

   • Not transient: If instance has ID != default(idType) then it is equals to another entity if both have the same id.
   • Transient: If instance has ID == default(idType) then it is equals to another entity if both are the same Reference. ReferenceEquals(this, other).

2. If entity doesn't have a POID property, for sure you will need a natural-id. Use natural id for equality and GetHashCode.

3. If you have a natural-id with many-to-one, instead of doing FooProperty.Equals(other.FooProperty), use FooProperty.Id.Equals(other.FooProperty.Id). Accessing the ID doesn't trigger the initialization of the lazy reference.

Last but not least, using composite-id is discourage, and composite id with key-many-to-one is very discourage.