I'm facing the exact same problem.
Did you find any way to migrate data with PB?
The only way I can think of is to keep generated code of each schema 
version and program the migration with that.


On Thursday, May 8, 2014 at 4:39:50 PM UTC-4, Klaus Kraft wrote:
>
> Hi,
>
> so far I have defined messages and the only changes I had to handle were 
> additions and deletions of fields and renamings of fields. It was no 
> problem to handle this using ProtoBuf. Now I am in the situation that I 
> defined a message and a field of the message needs to be moved to a field 
> of another message. How can one handle such a data migration scenario? The 
> main problem is that I do not want to lose the data that was associated 
> with the original field that is moved. 
>
> I would also be interested in how to handle comparable, complex, data 
> migration scenarios that go beyond additions, deletions and simple 
> renamings. If there is no direct support from ProtoBuf, is it possible to 
> implement migrations in Java (I'm using Java as my target language)?
>
> Thanks in advance.
>

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