Databases
StackOverflow2013
Postsdbo
POCore Data context and singleton data controller
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POCore Data context and singleton data controller
    primarykey
    data
    text
    <p>I have a singleton data controller to hold an array of objects. See for example bananas question for my solution: <a href="https://stackoverflow.com/questions/6324732/using-a-singleton-to-create-an-array-accessible-by-multiple-views">singelton dataController banansArray</a></p> <p>Now I want to save the array of bananas to persistant state. This core data tutorial: <a href="http://klanguedoc.hubpages.com/hub/Core-Data-How-To-Store-and-Display-Images-in-a-Core-Data-iPhone-App-iOS-iPad" rel="nofollow noreferrer">core data - store images</a> have given me a good general understanding of Core Data and I was able to include it in my application before changing my data Controller to singleton. </p> <p>Now what is best? </p> <p>Do I need to move the generated Core Data stack within the application delegate to the singletonDataController that manage the bananas array? Or do I have to set the context of the singleton in the application delegate as you do in the generated Master-View controller with Core Data template? </p> <p>In that case how do I set the context in the appDelegate? This does not work (it workes for the masterView in template) in the AppDelegate application <code>didFinishLaunchingWithOptions:</code></p> <pre><code>DataControllerSingleton *dataController; dataController.managedObjectContext = self.managedObjectContext; </code></pre> <p>In beerDataModel example provided the ManagedObjectCode is: </p> <pre><code>if (_mainContext == nil) { _mainContext = [[NSManagedObjectContext alloc] init]; _mainContext.persistentStoreCoordinator = [self persistentStoreCoordinator]; } </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USCommunity
    1. USdjcj
    plurals
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    3. PL
      singulars
      1. LTLinked
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COI have seen the answer in this post: http://stackoverflow.com/questions/6622699/singleton-managedobjectcontext and please feel free to further comment if its advisable to use singleton and coreData in this way
      singulars
      1. POCore Data context and singleton data controller
      1. USdjcj
    2. COPersonal choice. I'd move it to the singleton so the ownership and management is all in one place. The singleton is also easier to get a reference to in your classes that need access to the Model (compared to the app delegate).
      singulars
      1. POCore Data context and singleton data controller
      1. USWain
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload