ios - How to use entity relationship to get count difference of arrays -

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Suppose I have a data model with the organization department and role with relationship; Department & lt; - & gt; & Gt; Role . In my UI, I currently display the Department 1 and other departments in the Table Display list (eg, Department 2, Department 3 ...).

I'm trying to get a bunch of arrays: each per role can find an array of role division 1 shown me in every department, which can get Fekrikakvist and Wardiket but Can not find out how the array of roles for each department in the tableview can be found. Any help is greatly appreciated!

First of all, you do not need Arejh core data NSFetchedResultsController by It is managed - this table works best with the view Also, most likely you will not need any fetch requests.

To get all the roles in a department, please call your relationship Name: 

  department1.roles   
 The result is a  NSSet  that has not been ordered. You can order it, e.g.  
  department1.roles.sortedArrayUsingSortDescriptors ([NSSortDescriptor (Key: "Name" ascending: true)])   
 Table If you want to display it roles of sections and rows in sections, you  NSFetchedResultsController  to  role  code> sectionNameKeyPath  specified; E.g. Name).

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