Question

I have two entities. They are named SP and Code. I have 10 and 5 attributes in each respectively. I have inverse relationships on both the entities. I input the data into the model using the firefox addon sqlite manager. So I DID NOT WRITE a line like this
sp.coderelationship = codeObj; or code.sprelationship = spObj; anywhere in the code. Now in a viewcontroller i am retrieving data.
self.spArray = [self.managedObjectContext executeFetchRequest:fR error:&error];

for(SP *spObj in self.spArray)
{
    NSLog(@"description is %@",spObj.sPDescription);
    Code *codObj = spObj.coderelationship;
    NSLog(@"it has value %@",codObj);
    NSLog(@" unique name is %@",codObj.uniqueCodeName);
}

The output is correct for description. It prints a value “xyz”. But for the last 2 logs its null.
My Entities design

SP

-sPDescription
-sPName
-sPID
Relationship
-coderelationship

---

Code
-codeName
-codeID
-codeDate
Relationship
-sprelationship

If more information is needed let me know. Thanks..

Answer 1

Before executing the fetch request add this code:

NSString *relationshipKeyPath = @"coderelationship"; // Set this to the name of the relationship on "SP" that points to the "Code" objects;
NSArray *keyPaths = [NSArray arrayWithObject:relationshipKeyPath];
[fR setRelationshipKeyPathsForPrefetching:keyPaths];

Also, have you verified that the relationships have correctly been inserted into the db?