Return associated data from joined table?

[kerimdragolj]

I have associations like this

  events.belongsTo(models.users, {
      foreignKey: {
        name: 'creatorId',
        allowNull: false
      },
      onDelete: 'CASCADE'
    });
    events.belongsToMany(models.users, {
      through: 'event_participants'
    });
    models.users.belongsToMany(events, {
      through: 'event_participants'
    });

So i have tables events, users and event_participants. For now I'm returning just events by creatorId like this

hook.params.query = {
            $or: [
              { creatorId: '' + hook.params.user.id },
              {
                //TODO Model participants as many to many
              }
            ]
          }

But i also need to return associated data from joined table, so i need to return all events that this current user is associated with, so not only where he is creator, but where he is participant through event_participants table.

Also I'm trying to make method that will be called in after: hooks on find and get. In this method i should already have all needed events, but now for each event i need to make array of paricipants where i'm going to include all users that are associated with each event in joined table (event_participants). I was reading docs and i think it has to do something with hydrate/populate/include but couldnt make it work. For now it looks like this unction

includeParticipants(hook) {
  return hook.app.service('users').get(hook.params.payload.userId).then(user => {
    const model = hook.app.service('users').Model;
    const association = { include: [{ model: model, as: 'participants', attributes: ['userId'] }] };
    // TODO INCLUDE CRETOR AND PARTICIPANTS
    hydrate(association).call(this, hook);
    //but it gives me error: 'cannot read property 'Instance' of undefined

    hook.result.creator = { fulname: user.ime + ' ' + user.prezime };
    return hook;
  });
}

Hope its understendable and not too messy. I'm newbie and still trying to figure out how hooks and feathers work.

[thinksentient]

In case anyone else comes across a similar issue, looks like hydrate() expects to be called in the context of a service. This worked for me:
hydrate(association).call(hook.service, hook);