If you're a Rails developer and you're talking about "Data Migration,"
I'd guess your talking about database management with ActiveRecord?
So, ActiveRecord (in the context of Ruby) in an implementation of a
design pattern of the same name. ActiveRecord is an ORM, so maybe you
should have a look at Glorp (which is also an ORM, but for Smalltalk.)

Also, you should give Magma a try too. I played around with it over a
weekend, and was nearly convinced that I'd rather never deal with SQL
or ORMs every again. Nearly:) Anyway, most of the time you won't need
a database until your app needs to scale past a demo, because you can
just use image based persistence when developing.

Hopefully some of that helps.

On Thu, Dec 31, 2009 at 12:29 AM, Friedrich Dominicus
<frido at q-software-solutions.de> wrote:
> Dear Smalltalker, I'm trying to get into Smalltalk a bit more
> seriously. I'm especially currently trying to get into Seaside
> programmming and the persistence of Objects. I found GLASS, which seems
> to be remarkabel in that aspect. Now I wonder
>
> 1) How does one do versioning in Smalltalk. AFAIU it seems, one files
> out ChangeSets which then can be read in in another image. Am I wrong
> about that?
>
> 2) How does one Data Migration in Smalltalk? I just know it from Rails,
> where one has migrations, but how's that done in the Persistence layers
> of some Smalltalk. E.g what happens if I add or remove instance
> variables?
>
> There are somewhat related question but more about GLASS. I read teh
> gemstone soup up and down, and was able to install the Web Edition on my
> System also. It was a few days work but I learned a lot. However I found
> just a few videos about Gemstone, but not more "serious" use (with more
> database related stuff, scheme changes etc) Would you mind to share
> your experiences?
>
> Regards
> Friedrich
>
> --
> Q-Software Solutions GmbH; Sitz: Bruchsal; Registergericht: Mannheim
> Registriernummer: HRB232138; Geschaeftsfuehrer: Friedrich Dominicus
>
>



-- 
Ron