Re: Core Data question on calculating percentages
Re: Core Data question on calculating percentages
- Subject: Re: Core Data question on calculating percentages
- From: John Timmer <email@hidden>
- Date: Sat, 01 Oct 2005 10:39:13 -0400
- Thread-topic: Core Data question on calculating percentages
You should be able to make a fetch of all Expenses, then use the @sum
operator to get the total. You could either do this on the fly every time
it's needed, or in the "awakeFromFetch" and have your object observe its
managed object context for changes that include new entities or modified
expenses.
JT
> I have been trying to find a way to have an attribute in an Entity that will
> show me a percentage value. Example: you have an Entity "Expenses" that has
> attributes for "Expense Name", "Expense Amount", and "Percentage of total"
> Expenses". Where "Percentage of total" gives you the percentage the "Expense
> amount is of the total expenses. Is there an easy or not so easy way to do
> this. Have tried the @sum operator, fetch requests, etc. Seems like there
> should be a simple solution. Have searched the mail list but could not find
> anything. Any suggestions would be appreciated.
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