Re: CoreData issue when updating a file format
Re: CoreData issue when updating a file format
- Subject: Re: CoreData issue when updating a file format
- From: Jim Correia <email@hidden>
- Date: Fri, 6 May 2005 16:07:28 -0400
On May 6, 2005, at 1:12 PM, mmalcolm crawford wrote:
On May 6, 2005, at 8:27 AM, Bruno Blondeau wrote:
I'm trying to open a CoreData/SQLite document which was saved with
a v1 model. I'm getting an error, while it is working fine with
the XML data store (which automatically adds the needed columns
for the v2 model).
File formats are not backwards compatible. If you change the
schema (model), you cannot read old files.
Is there a capsule summary of how this situation should be handled?
What happens if version 2 of an app adds a new field? New
relationships? New entities? What steps need to be taken so that old
files can be read and "upgraded" to the new format?
Thanks,
Jim
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