swift - NSDecimalNumber.adding from NSManagedObjects hitting unrecognized selector issue -


first, let me thank in community in advance in getting me out of jam.

my app hits runtime error, , i've isolated line causing error.

when attempt add 2 nsdecimalnumber variables use .adding method, receive "unrecognized selector sent instance" error:

terminating app due uncaught exception 'nsinvalidargumentexception', reason: '-[__nscfnumber decimalnumberbyadding:]: unrecognized selector sent instance 0x608002c361a0'

i've created dummy nsdecimalnumber variables try , debug issue, , seem work fine when adding. however, when working nsmanagedobject variables (result , newtransaction) have nsdecimalnumber variables, run error.

below code causing these issues:

//testing dummy variables let a1 = nsdecimalnumber(decimal: 5.2) let a2 = nsdecimalnumber(decimal: 10.8)  print ("a1: \(a1), a2: \(a2)")         //a1: 5.2, a2: 10.8  let a3 = a1.adding(a2)  print ("a3: \(a3)")                    //a3: 16 //great, above works fine.  //now let's try using nsmanagedobjects, defined in section let = result.netchange               //result.netchange of class nsdecimalnumber let b = newtransaction.amount          //newtransaction.amount of class nsdecimalnumber  print ("a: \(a), b: \(b)")             //a: 444.12, b: 22.23  let c = a.adding(b)                    //<---this app crashes  print ("c: \(c)")                      //does not print, app has stopped 

my question: why dummy variables able add each other, while nsmanagedobject variables cannot?

thanks again!

a core data property of type "double" stored nsnumber in managed object context. not sufficient change type in nsmanagedobject subclass because accessor methods created dynamically @ runtime. code compiles, crashes @ runtime because variable nsnumber , not nsdecimalnumber.

the solution set type "decimal" in core data model inspector.


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