ios - NSExpression using sqrt: function results in NSInvalidArgumentException -


i'm getting nsinvalidargumentexception:

*** terminating app due uncaught exception 'nsinvalidargumentexception', reason: 'unsupported function type passed sql store'

when trying use nsexpression take square root of nested nsexpression using "multiply:by:" function.

my code looks this:

nsmanagedobjectcontext *context=[[bdcoredatacontroller sharedcontroller] mainmanagedobjectcontext]; nsfetchrequest *therequest=[[nsfetchrequest alloc] init];  [therequest setentity:[nsentitydescription entityforname:@"bdcompanyentity" inmanagedobjectcontext:context]]; therequest.resulttype=nsdictionaryresulttype;  nsexpression *constantexpression=[nsexpression expressionforconstantvalue:[nsnumber numberwithdouble:22.5]]; nsexpression *firstkeypath=[nsexpression expressionforkeypath:@"epsttm"]; nsexpression *secondkeypath=[nsexpression expressionforkeypath:@"bookvaluepershare"];  nsexpression *firstmultiplyexpression=[nsexpression expressionforfunction:@"multiply:by:" arguments:@[firstkeypath,secondkeypath]];  nsexpression *secondmultiplyexpression=[nsexpression expressionforfunction:@"multiply:by:" arguments:@[firstmultiplyexpression,constantexpression]];  nsexpression *sqrtexpression=[nsexpression expressionforfunction:@"sqrt:" arguments:@[secondmultiplyexpression]];  nsexpressiondescription *expressiondescription=[[nsexpressiondescription alloc] init]; [expressiondescription setname:@"grahamnumber"]; [expressiondescription setexpression:sqrtexpression]; [expressiondescription setexpressionresulttype:nsdoubleattributetype];  [therequest setpropertiestofetch:@[expressiondescription,@"name"]];  nserror *fetcherror; nsarray *grahams=[context executefetchrequest:therequest error:&fetcherror];

executing fetch trying evaluate nested "multiply:by:" works fine code: 

nsmanagedobjectcontext *context=[[bdcoredatacontroller sharedcontroller] mainmanagedobjectcontext]; nsfetchrequest *therequest=[[nsfetchrequest alloc] init];  [therequest setentity:[nsentitydescription entityforname:@"bdcompanyentity" inmanagedobjectcontext:context]]; therequest.resulttype=nsdictionaryresulttype;  nsexpression *constantexpression=[nsexpression expressionforconstantvalue:[nsnumber numberwithdouble:22.5]]; nsexpression *firstkeypath=[nsexpression expressionforkeypath:@"epsttm"]; nsexpression *secondkeypath=[nsexpression expressionforkeypath:@"bookvaluepershare"];  nsexpression *firstmultiplyexpression=[nsexpression expressionforfunction:@"multiply:by:" arguments:@[firstkeypath,secondkeypath]];  nsexpression *secondmultiplyexpression=[nsexpression expressionforfunction:@"multiply:by:" arguments:@[firstmultiplyexpression,constantexpression]];  nsexpressiondescription *expressiondescription=[[nsexpressiondescription alloc] init]; [expressiondescription setname:@"grahamnumber"]; [expressiondescription setexpression: secondmultiplyexpression]; [expressiondescription setexpressionresulttype:nsdoubleattributetype];  [therequest setpropertiestofetch:@[expressiondescription,@"name"]];  nserror *fetcherror; nsarray *grahams=[context executefetchrequest:therequest error:&fetcherror];

at first thought perhaps "sqrt" nsexpression having trouble nested nsexpression. tried constant nsexpression. following code tries take evaluate constant in sqrt nsexpression. causes same nsinvalidarguementexception

nsmanagedobjectcontext *context=[[bdcoredatacontroller sharedcontroller] mainmanagedobjectcontext]; nsfetchrequest *therequest=[[nsfetchrequest alloc] init];  [therequest setentity:[nsentitydescription entityforname:@"bdcompanyentity" inmanagedobjectcontext:context]]; therequest.resulttype=nsdictionaryresulttype;  nsexpression *constantexpression=[nsexpression expressionforconstantvalue:[nsnumber numberwithdouble:22.5]];  nsexpression *sqrtexpression=[nsexpression expressionforfunction:@"sqrt:" arguments:@[constantexpression]];  nsexpressiondescription *expressiondescription=[[nsexpressiondescription alloc] init]; [expressiondescription setname:@"grahamnumber"]; [expressiondescription setexpression:sqrtexpression]; [expressiondescription setexpressionresulttype:nsdoubleattributetype];  [therequest setpropertiestofetch:@[expressiondescription,@"name"]];  nserror *fetcherror; nsarray *grahams=[context executefetchrequest:therequest error:&fetcherror];

any ideas causing problem?

thanks

toolman

not every expression that's valid nsexpression valid use when fetching core data when using sqlite store. unfortunately sqrt: not supported kind of use. work binary store, loses many of advantages of core data (it mean loading data memory @ once, example).

what's annoying there's no documented list indicates functions supported use core data. error message correct: although function valid use nsexpression, it's not valid use sqlite persistent store.


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