ios - NSFetchRequest on a specific store -

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i starting use multiple persistent stores core data. wrote following code:

- (nsuinteger)countentity:(nsstring*)entityname             withpredicate:(nspredicate*)predicate                   onstore:(nsstring*)configname {     nsfetchrequest *request=[[nsfetchrequest alloc] init];     if (predicate) [request setpredicate:predicate];     nserror *error=nil;     [request setentity:[nsentitydescription entityforname:entityname                                    inmanagedobjectcontext:context]];     [request setaffectedstores:      [nsarray arraywithobject:[[configurdico objectforkey:configname]                                objectforkey:@"store"]]];     nsuinteger count=[context countforfetchrequest:request error:&error]; // problematic line.     return count; }

but following message, on line problematic line un debugger.

2014-12-06 02:56:10.932 theapp[1501:76002] -[nsurl executerequest:withcontext:error:]: unrecognized selector sent instance 0x1757df50

what doing wrong?

for reference have following method, previous one, working perfectly:

- (nsuinteger)countentity:(nsstring*)entityname              withpredicate:(nspredicate*)predicate {     nsfetchrequest *request=[[nsfetchrequest alloc] init];     if (predicate) [request setpredicate:predicate];     nserror *error=nil;     [request setentity:[nsentitydescription entityforname:entityname                                    inmanagedobjectcontext:context]];     nsuinteger count=[context countforfetchrequest:request error:&error];     return count; }

that makes me think, since line added, must using setaffectedstores: wrong way.

your context variable of wrong type (nsurl instead of nsmanagedobjectcontext). make sure set core data stack correctly.


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