Re: [Wonder-disc] Migration of Existing DB with New ERAttachment

[Pascal R. <pr...@ma...>]

Your migration class should look like this :

public class WOCommunity1 extends ERAttachmentMigration {

	public WOCommunity1() {
		super("ORGANIZATION_PROFILE", "ORGP_LOGOID", true);
	}

	public NSArray<ERXModelVersion> modelDependencies() {
		return null;
	}

	@Override
	public void downgrade(EOEditingContext editingContext,  
ERXMigrationDatabase database) throws Throwable {
		// DO NOTHING
	}
}

ORGANIZATION_PROFILE being the table that have a relation to  
ERAttachment, ORGP_LOGOIP being the column that store the attachment  
PK. I ran this migration after the first one (WOCommunity0), who  
created all the tables from my model.

Have you check the recording from WOWODC East? David is discussing  
migrations in details in this one :

	http://www.wocommunity.org/podcasts/WOWODC09E-ThisYearModel.mov

> I can't seem to find the magic properties combination...
>
> I have an existing database and model. I want to add ERAttachment  
> using this
> very cool "Migrations" feature. However, it keeps breaking when it  
> tries to create
> the table that exists.
>
> If I set
>
> MusicFestModel.InitialMigrationVersion=1
>
> Then nothing runs? I can't seem to just make it create ERAttachments.
>
> Thoughts?
> Thanks
> James Cicenia
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