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问同一集合的流星合并游标
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Stack Overflow用户

提问于 2014-03-22 17:23:14

回答 2查看 2.8K关注 0票数 4

在我的社交应用程序(如FB)中，我有一个奇怪的需求，那就是在一次发布中合并同一个集合用户的两个游标！

Meteor服务器打印此错误：“发布函数返回集合用户的多个游标”。

也许在Meteor 0.7.2中做不到这一点，也许我搞错了。但是我已经看到了游标的结构非常简单，因为我可以进行一个简单的数组合并并返回一个游标？

客户端

Meteor.subscribe('friendById', friend._id, function() {
    //here show my friend data and his friends
});

服务器

//shared functions in lib(NOT EDITABLE)
getUsersByIds = function(usersIds) {
    return Meteor.users.find({_id:  {$in: usersIds} },
                            {
                                fields: {   // limited fields(FRIEND OF FRIEND)
                                    username: 1,
                                    avatar_url: 1
                                }
                            });
};
getFriendById = function(userId) {
    return Meteor.users.find(userId,
                            {
                                fields: {   // full fields(ONLY FOR FRIENDS)
                                    username: 1,
                                    avatar_url: 1,
                                    online: 1,
                                    favorites: 1,
                                    follow: 1,
                                    friends: 1
                                }
                            });
};

Meteor.publish('friendById', function(userId) { //publish user data and his friends

    if(this.userId && userId)
    {
        var userCur = getFriendById(userId),
            userFriends = userCur.fetch()[0].friends,
            retCurs = [];

        //every return friend data
        retCurs.push( userCur );

        //if user has friends! returns them but with limited fields:

        if(userFriends.length > 0)
            retCurs.push( getUsersByIds(userFriends) );

        //FIXME ERROR "Publish function returned multiple cursors for collection users"

        return retCurs;     //return one or more cursor
    }
    else
        this.ready();
});

javascript

meteor

collections

merge

回答 2

Stack Overflow用户

回答已采纳

发布于 2014-03-25 09:57:18

溶液

Meteor.publish('friendById', function(userId) {

    if(this.userId && userId)
    {
        var userCur = getFriendById(userId),  //user full fields
            userData = userCur.fetch()[0],
            isFriend = userData.friends.indexOf(this.userId) != -1,
            retCurs = [];

        //user and his friends with limited fields
        retCurs.push( getUsersByIds( _.union(userId, userData.friends) ));

        if(isFriend)
        {
            console.log('IS FRIEND');

            this.added('users',userId, userData);   //MERGE full fields if friend
            //..add more fields and collections in reCurs..
        }

        return retCurs;
    }
    else
        this.ready();
});