tabular server-side selector

selector.js

    selector: function( userId ) {
      var roleNames = _.pluck(Roles.find({users: {$in: [userId]}}, {fields: {name: 1, _id: 0}}).fetch(), 'name');
      var users = [];
      var query;
      if (_.contains(roleNames, 'manager')) {
        // this wrapping is just for keeping the code readable
        query = Meteor.users.find({}, { fields: {_id: 1 }, transform: function (doc) { doc.users = doc._id; return doc;}});
        // or:
        // query = { users: [ userId ] };
      } else if (_.contains(roleNames, 'admin')) {
        query = Groups.find({ users: { $in: [userId] }}, { fields: { users: 1, _id:0 }});

      } else if (_.contains(roleNames, 'user')) {
        // this may sound silly, but keeps the code readable
        query = Meteor.users.find({_id: userId},{ fields: {_id: 1 }, transform: function (doc) { doc.users = doc._id; return doc;}});

      }
      users = _.flatten( _.pluck( query.fetch(), 'users' ));

      return { createdBy: {$in: users }};
    },