Grails / GORM, read-only cache and transient fields

Posted by Stephen Swensen on Stack Overflow See other posts from Stack Overflow or by Stephen Swensen
Published on 2010-05-18T17:04:11Z Indexed on 2010/05/18 18:20 UTC
Read the original article Hit count: 474

Filed under:

grails

|

gorm

|

hibernate

|

ehcache

Suppose I have the following Domain object mapping to a legacy table, utilizing read-only second-level cache, and having a transient field:

class DomainObject {
 static def transients = ['userId']

 Long id
 Long userId

 static mapping = {
  cache usage: 'read-only'
  table 'SOME_TABLE'
 }
}

I have a problem, references to DomainObject instances seem to be shared due to the caching, and thus transient fields are writing over each other. For example,

def r1 = DomainObject.get(1)
r1.userId = 22

def r2 = DomainObject.get(1)
r2.userId = 34

assert r1.userId == 34

That is, r1 and r2 are references to the same instance. This is undesirable, I would like to cache the table data without sharing references. Any ideas?

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