Magical Record cascade delete (truncateAll) not deleting

I'm using Magical Record in my app.

I have a relationship...

Competition <-->> League

i.e. A Competition can have many Leagues. A League can only have one Competition.

The delete rule from Competition to League is set to Cascade. The inverse delete rule is set to Nullify.

What I would expect to happen is if I delete a Competition then all Leagues that belong to it are deleted also. (I have used this in previous apps successfully).

I am testing by doing...

Download and insert all competitions and leagues.

Log all Leagues with Competition names.

NSArray *leagues = [League findAll];
for (League *league in *leagues)
{
    NSLog(@"%@ - %@", league.name, league.competition.name);
}

e.g. Man UTD - Premier League

run the following code...
```
[Competition truncateAll];
```
Log all Leagues with Competition names.
```
e.g. Man UTD - (null)
```

I was expecting this to delete the Leagues as well as the Competitions?

Is my assumption correct in what it should do? Why isn't it doing it?

Solution

The relationship delete rules are applied when the managed object context is saved, or processPendingChanges is called.

As can be seen in the implementation, the MagicalRecord method MR_truncateAll calls deleteObject on all objects of an entity, but does not save the context.