efficient copy?
efficient copy?
- Subject: efficient copy?
- From: OC <email@hidden>
- Date: Sun, 01 Mar 2015 16:51:44 +0100
Hello there,
I'll need to copy thousands of objects from one table to another; the copying'll be almost verbatim, but for a relationship. Namely,
entity OldAuction <->> OldRecord (relationships records->> and inverse <-auction)
entity NewAuction <->> NewRecord (relationships records->> and inverse <-newAuction)
Entity NewRecord has all attributes of OldRecord (and perhaps a couple of others)
The naïve code would be something like
===
def orig=... an object of the OldAuction entity ...
def new=... an object of the NewAuction entity ...
orig.allRecords().each { OldRecord old ->
def newRecord=EOUtilities.createAndInsertInstance(new.editingContext(),'NewRecord')
newRecord.newAuction=new
newRecord.takeValuesFromDictionary(old.valuesForKeys(old.attributeKeys()))
}
new.editingContext().saveChanges()
===
There's no need to make this lightning fast, e.g., a dedicated SQL procedure would definitely be an overkill; but still, it should be as fast as possible without making the code too complex, unintelligible and unmaintainable. I wonder, what's the best way? Guess I might e.g., fetch rawrows for orig.allRecords somehow, and use _them_ for the takeValuesFromDictionary argument?
Thanks,
OC
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