Meteor 发布错误 - 发布函数返回非游标数组

我有这个出版物

Meteor.publish('temsInThisCompetition', function (id) {
var teams = [];
return Competitions.find(id).fetch().map(function (doc) {
    for(var item in doc.teams){
        teams.push(Teams.find(item));
    }
    return teams;
});
});

但我收到这个错误

 Exception from sub temsInThisCompetition id kDPuEbc9dtWn2tfT3 Error: Publish function returned an array of non-Cursors

这为我解决了问题

Meteor.publish('teamsInThisCompetition', function (id) {
var competition = Competitions.findOne(id);
return Teams.find({_id:{$in:competition.teams}});
});