I know how to create a NSFetchRequest on a transaction object but I
am unsure on how to create the NSPredicate object to extract all the
transactions that were created prior to the current transaction.
How about consulting the documentation?
Fetching (trust me - re-read this)
http://developer.apple.com/documentation/Cocoa/Conceptual/CoreData/Articles/cdFetching.html
Predicates Programming Guide (useful for the future, but probably not
needed in your case right now)
http://developer.apple.com/documentation/Cocoa/Conceptual/Predicates/predicates.html
I am trying to figure out how to calculate a running total using
core data.
Keep this in mind:
Set & Array Operators (directly relevant)
http://developer.apple.com/documentation/Cocoa/Conceptual/KeyValueCoding/Concepts/ArrayOperators.html
Interestingly, the example used in the above is similar to what
you're doing ...
--
I.S.
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