GORM should not check Entity's dirtiness on formula and transient type of properties

[aulea]

Fix for issue #1708

When using "formula" kind of property on GORM entity and marking whole class as dirty, then during entity's save GORM Hibernate will want to include "formula" also into update clause. Hibernate ignores it, but started to log about such situations on WARN level: "HHH000502: The [formula_kind_property_name] property of the [entity_class_name] entity was modified, but it won't be updated because the property is immutable." For workaround, I will make sure that only changed properties are marked dirty and will not use method to mark whole class as dirty. But it would be nice to be able to use markDirty on whole class, with formulas.

It could be handled at GORM Hibernate side, but I decided to handle it on GORM side - not to tell/track changes for derived(ex. formula) and transient properties.

For GORM entities, dirtiness check is added "manually" during AST transformation, not through trait (fix for #1126). So I couldn't simply extend or override dirty checks in GormEntity trait. That's why I created new trait GormEntityDirtyCheckable, which i will add "manually" during AST transformation. Maybe someone who is better in metaprogramming/tranformation could do it with the trait.

[puneetbehl]

Thank you for the pull request. Can you please open an issue describing the problem and steps to replicate it?