Gunnar, Ricardo
I did set the "original" values to the "current" values in the hopes that
NH will see it as unchanged - but that didn't work. It was done inside the
PostLoad Event handler as follows. I had to resort to reflection since it's
a private field without an interface...
// Get current values
object[] currentState = persister.GetPropertyValues(entity,
session.EntityMode);
// Set original values to current values
var fieldInfo = typeof(EntityEntry).GetField("loadedState",
BindingFlags.Instance | BindingFlags.NonPublic);
if (fieldInfo != null)
fieldInfo.SetValue(entityEntry, currentState);
Despite doing this, this entity still gets written out when we hit Commit()
- so NH might be performing it's clean/dirty decision and enlistment of
what must be written prior to this.
Gunnar,
using the IPreLoadEventListener won't work because the values are NULL at
that stage
Anne,
Appreciate the alternative strategies but they won't work. Our larger
design is out of scope here but briefly,
1) Read from database
2) Transform certain properties. Transformation is for compatibility with
this next layer of software (that we don't control)
3) Reset entity state to clean so that a Commit() at this point in time
doesn't end up creating a dB write.
4) Next layer can do as it pleases with any properties of the entity
5) Reverse transform certain properties
6) If any changes due to #4 or #5 (but NOT #2), issue a write back to dB
The issue is that unlike EF, there seems to be no way to perform #3 in NH :(
Lastly, I understand there might be an approach via custom User Type. The
only downside with custom user type is that we’d be scoped to just that
property in the post processing hooks i.e. scoped to property level
visibility. Currently our post-processing chain also does additional
entity-level processing to the entire entity (all properties) if special
“properties of interest” are seen in transit. We'd like to maintain that
feature so that NHibernate and EntityFramework databases/projects are on
equal footing.
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