Working if Cocoa Core Data
Working if Cocoa Core Data
- Subject: Working if Cocoa Core Data
- From: "Thiago Rossi" <email@hidden>
- Date: Wed, 18 Jun 2008 15:33:57 -0300
Hello, guys!
I've been studying the Cocoa Core Data and I have a question about it. I
went through a blog tutorial I got at the Internet and I build my first
Cocoa Application. So I decided to do something by my own: a financial
controller.
To make it simple, I used Account and Transaction objects with an
one-to-many relationship. Their properties are:
*Account*
- name
*Transaction*
- date
- description
- value
- amount
*Amount* is an calculated field and it depends on the previous transactions.
I don't know how to do it! It is not a value I can save on database, for
example, because it changes all the time (I guess I have to mark the
transient field at Core Data).
The view would seem something like this:
Date Value Amount
01/01/2008 +450.00 +450.00
01/02/2008 +100.00 +550.00
01/02/2008 -50.00 +500.00
If I add a transaction between the first and the second after some days, it
would show this (changing all the amount values, except from the ones
before):
Date Value Amount
01/01/2008 +450.00 +450.00
01/02/2008 +200.00 +650.00
01/02/2008 +100.00 +750.00
01/02/2008 -50.00 +700.00
Can anyone please help me?
I'm not used to this kind of programming like I wrote an entire blog without
any code line. I guss I have to write some code now, but I don't know how,
when and if I'm not abusing on you, which one.
Thank you!
Thiago.
*- I'm a Java programmer who wants to migrate to ObjC/Cocoa.*
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