Core data model problems
<p>I'm trying to build a model for an app of events. For each event one of participants pay for all others and at the end of the event the participants pay back the original payer. I imagined this model like in the image attached but I don't know if can be the right way: I have some doubts about the participants who pay back. Is this a good way? Or I have missed something? <a href="http://i.stack.imgur.com/yKarS.png" rel="nofollow">model image</a> </p>