ios - Update Coredata Attributes without Duplication -

i have 3 textfields-name,age,phone number every time entering values on each fields stored on core data

also want check repetition in db, is

• first want check there repetition in name
• if repetition, check age , phone number.
• if age same can not change.
• if difference in phone number, second number replace first phone number.

i tried lot.. pls me

my code is

nsentitydescription *entitydescc=[nsentitydescription entityforname:@"name" inmanagedobjectcontext:self.managedobjectcontext]; nsfetchrequest *request=[[nsfetchrequest alloc]init]; [request setentity:entitydescc]; nspredicate *predicate=[nspredicate predicatewithformat:@"sname %@ ",self.nametextfield.text]; [request setpredicate:predicate]; nserror *error; nsarray *matchingdata=[self.managedobjectcontext executefetchrequest:request error:&error];  if (matchingdata.count<=0) {     nsentitydescription *entitydesc=[nsentitydescription entityforname:@"name" inmanagedobjectcontext:self.managedobjectcontext];     nsmanagedobject *newobject=[[nsmanagedobject alloc]initwithentity:entitydesc insertintomanagedobjectcontext:self.managedobjectcontext];     [newobject setvalue:self.nametextfield.text forkey:@"sname"];     [newobject setvalue:self.agetextfield.text forkey:@"age"];     nserror *error;     [self.managedobjectcontext save:&error]; } else{      int count=0;      (record *obj in matchingdata) {         nsentitydescription *entitydescc=[nsentitydescription entityforname:@"name" inmanagedobjectcontext:self.managedobjectcontext];         nsfetchrequest *request=[[nsfetchrequest alloc]init];         [request setentity:entitydescc];  nspredicate *predicate=[nspredicate predicatewithformat:@"age %@ ",self.agetextfield.text]; [request setpredicate:predicate]; [request setpredicate:predicate];  nserror *error; nsarray *matchingdata=[self.managedobjectcontext executefetchrequest:request error:&error];               if (matchingdata.count<=0) {                nslog(@"entered");               nsentitydescription *entitydesc=[nsentitydescription entityforname:@"name" inmanagedobjectcontext:self.managedobjectcontext];               nsmanagedobject *newobject=[[nsmanagedobject alloc]initwithentity:entitydesc insertintomanagedobjectcontext:self.managedobjectcontext];                 [newobject setvalue:self.agetextfield.text forkey:@"age"];                 nserror *error;               [self.managedobjectcontext save:&error];           }           ++count;         }      } 

it not check attribute age

save 3 details in single entity. fetch records in given entity, out predicate. create model class each record. business logic using model class list. solve problem , make app perform better.