Getting started with Trap.apex

Find Specific Objects

Trap.apex makes it clear and convenient to do business logic only to some specific objects. For example, here is how we want to prevent changing the Case subject.

bulkObj.newStream
    .filter(Trap.F.changed('Subject'))
    .subscribe(Trap.F.addError.apply('Cannot modify subject'));

With the power of R.apex, it is possible to compose complicated filter logic like:

Func changed = (Func)R.anyPass.run(
    Trap.F.changed('Subject'),
    Trap.F.changed('OtherField')
);

bulkObj.newStream
    .filter(changed)
    .subscribe(...);
Done