I've run into an issue that I haven't seen before with our mapping models: If 
the filter predicate was set, and is then cleared, migration complains about 
the empty filter predicate with:

        NSInvalidArgumentException: Unable to parse the format string ""

I'm having to hand-edit the mapping XML files to remove the 
"sourcefilterpredicatestring" attribute tag altogether in order to make it 
happy.

Is this a bug introduced in Xcode 6.3.1, that emptying the editor Filter 
Predicate field leaves an empty XML tag, that the migration code can't handle? 
That's what seems to be happening, but I haven't checked against an older 
version of Xcode to see if it doesn't do that.

-- 
Rick Mann
rm...@latencyzero.com



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