How to import data to Core data

Question

I am building an iPhone application which pulls a lot of information from an webservices that sends XML.

The problem now is that I am going to import a set of data that needs to import in 4 or 5 related tables. It depends if the city exists in Core data.

The database looks like this: City - Club - track

The way how I would do it now is to put all the data in the database for each model. So I would loop 4 or 5 times the data an put this in the database. But in my head I think there has to be a better way.

Answer 1

One basic document is this Apple CoreData doc called "Efficiently importing data". I am also building an app like yours (although on a Mac), and had implemented a very stupid importing routine which was very slow. Following the recommendation in that document made a huge difference and made importing much, much faster! Pay your attention in particular to the last section, "Implementing Find-or-Create Efficiently".