MongoDB $拉不起作用

时间:2015-03-26 17:00:08

标签: javascript arrays mongodb meteor

我正在构建一个Meteor应用程序,我有竞赛/参赛作品集合。当有人参加比赛时,他们的user_id会被推送到带有$ addToSet的Contest.entered_users数组中。这是代码:

entryInsert: function(entryAttributes) {
    check(Meteor.userId(), String);
    check(entryAttributes, {
        contest_id: String
    });

    var user = Meteor.user();
    var entry = _.extend(entryAttributes, {
        user_id: user._id,
        user_name: user.profile.name,
        submitted: new Date(),
        submitted_day: moment().format('MMM D')
    });

    var currentContest = Contests.findOne(entryAttributes.contest_id);

    // Check to make sure that the person has not already entered the giveaway
    if (currentContest.entered_users.indexOf(entry.user_id) !== -1) {
        throw new Meteor.Error('invalid', "You have already entered the giveaway");
    } else {
        Contests.update(
            currentContest._id,
            {
                $addToSet: {entered_users: entry.user_id},
                $inc: {entries: 1}}
        );
    }


    // Create entry in order to get the entry id
    var entryId = Entries.insert(entry, function(err) {
        if (err) {
            alert(err.reason);
        }
    });



    return {
        _id: entryId
    }
}

我希望在删除条目时从Contest.entered_users数组中删除person user_id。我试图使用$ pull但它似乎没有工作......当我删除一个条目时,entry.user_id仍然在contest.entered_users数组中。以下是相关代码:

'click .entry-delete': function(e, tmpl) {
    e.preventDefault();

    var currentEntry = this;
    var currentEntryId = this._id;

    var contestId = Contests.findOne(currentEntry.contest_id);

    // Update the contest by removing the entry's useer_id from entered_users
    Meteor.call('contestRemoveEntry', contestId, currentEntry, function(error) {
        if (error) {
            alert(error.reason);
        }
    });

    Meteor.call('entryRemove', currentEntryId, function(error) {
        if(error) {
            alert(error.reason);
        }
    });
}

这是contestRemoveEntry方法:

contestRemoveEntry: function(contestId, currentEntry) {
    Contests.update({ _id: contestId }, { $pull: { entered_users: currentEntry.user_id } } );
}

关于为什么这不起作用的任何想法?我尝试过其他SO解决方案,但似乎没有任何工作。

1 个答案:

答案 0 :(得分:1)

看来这是让拉动工作的正确方法:

Contests.update(contestId, { $pull: { entered_users: currentEntry.user_id } } );