title: Updating Parse iOS Local Datastore
body: <p>I am creating a game for the iPhone, and the main screen is a list of games that the current user has in progress. I want to use the parse local datastore because my queries take a long time when there are a lot of games in progress. I have a question about the datastore that does not seem to be answered clearly in the docs.</p>
  
  <p>When the app opens, I query my table of games in the background, sort them based on status (your turn, their turn, over), and display them in a table. In order to speed this process up I would like to pin all of these objects to the local datastore.</p>
  
  <p>When the user refreshes the tableview to see if any of the game statuses have changed, I would like to query the datastore to retrieve all of the relevant objects, but then also query the network for any <em>changes</em> in the objects, and for any new ones. However, it does not seem that there is anyway to make the local datastore "up-to-date". The only way I have seen is to query the network completely, unpin currently stored objects, and pin the newly retrieved objects. If this is the case, I do not see the point in using the local datastore because my queries will be just as slow.</p>
  
  <p>Basically, everytime the user pulls to refresh the table, I would like the datastore to be queried, and then the network to check for any new objects or changed columns.</p>
  
  <p>So, is there a way to query the local datastore and subsequently update those objects and/or add new ones from the network?</p>
  
  <p>I have also realized that I am doing quite a bit of sorting. Could this have an affect on the long wait time for the table to load?</p>