iphone - Core Data Relationships Help ... should be basic i hope -

so have 2 relationships between 2 entities in core data, titled "number" , "info." give user number , when them in return give me name can tie specific number. cannot seem code right this. far closest think have gotten this:

        (usernumber *pinnumbers in [entryview pinnumberarray]) {             if ([numberstring isequaltostring:pinnumbers.pin]) {                 userinfo *info = pinnumbers.info;                    [info setname:namefield.text];               }         } 

where loop through number have entered , if can find inside array core data populates them assign name this. show me example of how might done?

thanks.

if model this:

such there one-to-one bidirectional relationship between usernumber , userinfo, seems have 'number' attribute of userinfo , simplify model. (is case 'number' unique each userinfo?)

but, going current model, assuming one-to-one relationship, should work - provided usernumber has 'number' attribute , to-one relationship called 'info' points userinfo.

// search usernumber has nsstring* pincode value attribute pin nsfetchrequest *fetchrequest = [[nsfetchrequest alloc] init]; [fetchrequest setentity:[nsentitydescription entityforname:@"usernumber"                          inmanagedobjectcontext:managedobjectcontext]]; nspredicate *predicate = [nspredicate predicatewithformat:@"pin contains[cd] %@", pincode]; [fetchrequest setpredicate:predicate];  nserror *error = nil; nsarray *items = [managedobjectcontext executefetchrequest:fetchrequest error:&error]; [fetchrequest release];  // usernumber matching pin found, set name of associated userinfo. if ( [items count] == 1 )     {        usernumber *usernumber = [items lastobject];     userinfo *userinfo = [usernumber info];     [userinfo setname:namefield.text];     } 

note items should have either 0 or 1 element. if one, first element matching usernumber. traversing usernumber's 'info' relationship, able corresponding userinfo - provided you've created link previously.

update

in writing code snippet, realized don't understand trying ;-). part of registration process? if so, need deal creation of userinfo object and relationship between objects. or part of logging in? or part of editing user info? anyway, hope helps.