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objective-ccocoacore-datacocoa-bindings

Find SUM of an array of managed objects

I have a big problem with taking a simple Total Cost from an array!

I have an entity called currentCost, it contains two attributes: costAmount and costDesc. I bind it to an array controller and I have no problem when I add and remove items to and from this entity. The problem is to get the Total Cost from the costAmount attributes and show it in a text field.

I think I have to fetch all costAmounts to another array and take the total of them, but it seems I don't know how to do this! What is the best approach ?

Thank you in advance.

Solution

  • Bind the text field to the array controller and specify @sum.costAmount as the key path.