Retrieving Relationships from within two arrays of pointers

Question

In a portion of a program I'm working on, I need to count all the times each person has worked on projects with each other person. Let's say we have "Employee" entities and "Session" entities. In each session, there are four project types, "A", "B", "C", & "D", each a many-to-many relationship to Employees.

I'm making a loop to systematically review every person a selected person has worked with. First, I put all their project types in a single array, so it's easier to loop through, but by the time I ask the last nested Project for its Employee members, I get an "unrecognized selector" error.

IBOutlet NSArrayController * superList;

EDIT: I forgot to represent this array that points to the controller's arrangedObjects.

NSArray * list = [superList arrangedObjects];
int x;
for(x = 0; x < [list count]; x++){
NSArray *A = [[list objectAtIndex:x] valueForKey:@"projectAs"];
NSArray *A = [[list objectAtIndex:x] valueForKey:@"projectBs"];
NSArray *A = [[list objectAtIndex:x] valueForKey:@"projectCs"];
NSArray *A = [[list objectAtIndex:x] valueForKey:@"projectDs"];

NSArray *masterList = [[NSArray alloc] initWithObjects: projectAs, projectBs, projectCs, projectDs, nil];

int y;
for(y = 0; y < [masterList count]; y++){
int z;
for(z = 0; z < [[masterlist objectAtIndex:y] count]; z++){
//And now to make an Array of this employee's partners on the selected object, to run comparisons on.
//I also have an array of keys for each session's teams, so that's what I'm referencing here:
NSArray * thisTeam = [list objectAtIndex:y] objectAtIndex:z] valueForKey:projectKey];

This throws an exception... namely, -[_NSFaultingMutableSet objectAtIndex:]: unrecognized selector sent to instance

What's wrong with that last Array creation?

Answer 1

Based on your line:

NSArray *A = [[list objectAtIndex:x] valueForKey:@"projectAs"];

The call:

[list objectAtIndex:y]

does not return an array - it returns a NSDictionary, which means you cannot call objectAtIndex:z on the result.

It appears this should be [masterlist objectAtIndex:y] ?