Operation hook for hasAndBelongsToMany

Question

How can I configure an operation hook, such as after save, when linking or unlinking an instance of the foreign model?

Using loopback's example Assembly and Part model: https://docs.strongloop.com/display/public/LB/HasAndBelongsToMany+relations

I would like to execute code when adding (or removing) a part to an assembly through PUT /assembly/{assembly_id}/parts/rel/{part_id}

Answer 1

I was afraid I would have to lose the magical 'hasAndBelongsToMany' and be forced to use hasManyThrough.

But, turns out you can define your methods in the defined models (Assembly and Part)

Assembly.afterRemote('*.__link__parts', function(context, instance, next){
    console.log(instance);
    next();
});

Assembly.afterRemote('*.__unlink__parts', function(context, instance, next){
    console.log(instance);
    next();
});