[GemStone-Smalltalk] migrating to SmallDate and SmallDateAndTime

[Wai Lun Mang]

 A way to do this is to find all the instances of Date using the allInstances method and iterated it.  Create the corresponding SmallDateAndTime and use become: to swap the pointers.  Once you have all the instances (store them in some global), you can use multi gem sessions to perform the migration assuming you have a lot of them.  
One thing to be careful is that gemstone system objects might have Date instances, it is safe to migrate them?
    On Thursday, September 1, 2022 at 09:51:46 AM PDT, Richard Sargent via GemStone-Smalltalk <gemstone-smalltalk at lists.gemtalksystems.com> wrote:  
 
 Sorry, Otto. #copy will NOT do it. I misread my results.
I suggest you create an e.g. #normalized method on the various original classes and on their Small* subclasses and on Object. Object and the Small* classes would answer self. The implementation on DateAndTime, etc.would use the instance creation API to create a new instance (which would turn out to be the special OOP encoded object). Replace the instance if #normalized gives you a different object, leave it alone if it answers the original object.


On Thu, Sep 1, 2022 at 9:32 AM Otto Behrens <otto at finworks.biz> wrote:

Ha! Thanks a lot Richard
On Thu, 01 Sep 2022, 18:23 Richard Sargent, <richard.sargent at gemtalksystems.com> wrote:

On Thu, Sep 1, 2022 at 5:18 AM Otto Behrens via GemStone-Smalltalk <gemstone-smalltalk at lists.gemtalksystems.com> wrote:

Hi,
We are upgrading to GS 3.6.x and would like to convert our Date objects to SmallDate and DateAndTime objects to SmallDateAndTime. What would be an efficient way to do this? I reckon I will have to hunt for the most commonly used places where they are used and then just convert.

Repository>>allReferencesToInstancesOfClasses: can be used to find the referencing objects. 
 


What would be the best methods to use to create a new SmallDate from a Date and a SmallDateAndTime from a DateAndTime?

Sending #copy to the old DateAndTime should answer a SmallDateAndTime.  



Thanks

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Otto Behrens


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