gistfile1.m

- (DBRestClient *)restClient
{
    if (!self.user_identifier)
        return nil;
    
    if (!_restClient)
    {
        if ([[DBSession sharedSession] credentialStoreForUserId:self.user_identifier])
        {
            _restClient = [[DBRestClient alloc] initWithSession:[DBSession sharedSession] userId:self.user_identifier];
        }
        else
        {
            MPOAuthCredentialConcreteStore *store = [[DBSession sharedSession] baseCredentialStore];
            [store setKeysForPersistenceResponseString:self.persistence];
            _restClient = [[DBRestClient alloc] initWithSession:[DBSession sharedSession] credinalStore:store userId:self.user_identifier];
        }

        _restClient.delegate = self;
    }
    return _restClient;
}