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Calculated Field examples for Core Data

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Calculated Field examples for Core Data

Subject: Calculated Field examples for Core Data
From: Clayton Leitch <email@hidden>
Date: Fri, 12 Aug 2005 19:24:17 -0400

I have everything working in a simple contract tracking program that uses core data. There are two entities, contract and invoiceData. There is a one to many relationship between contract and invoiceData, one contract to many invoices. Contracts are generally for one year and there will be one invoice for each month. The data on the invoice is the actual bill amount, the expected bill amount, that was predicted at the start of the contract. I would like to calculate the difference between the amounts automatically and display. Secondly, I would like to calculate the total of all invoices received against the contract, to date and display it. Downloadable code example would be helpful.

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