Question

以下是我创建的所有模式。我使用方法findByIdAndUpdate()向Club架构添加新帖子。现在，我想在帖子中添加评论。我也尝试过同样的评论，但它没有用。我也试过this，我得到了下面提到的错误。任何帮助深表感谢。提前谢谢。

var mongoose = require('mongoose');
var Schema  = mongoose.Schema;
var Post = require('./posts');

var clubSchema = new Schema({
    name: {
        type: String,
        required: true,
        unique: true
    },
    abbreviation: {
        type: String,
        required: true,
        unique: true
    },
    followers: {
        type: Number,
        default: 0
    },
    posts: [Post.Schema]
});

module.exports = mongoose.model('Club', clubSchema);

var mongoose = require('mongoose');
var Schema  = mongoose.Schema;
var Comment = require('./comments');

var postSchema = new Schema({
    title: {
        type: String,
        required: true
    },
    content: {
        type: String,
        required: true
    },
    createdBy: {
        type: String,
        required: true
    },
    date: {
        type: Date,
        default: Date.now
    },
    comments: [Comment.Schema],
    votes: {
        type: Number,
        default: 0
    }
});

module.exports = mongoose.model('Post', postSchema);

var mongoose = require('mongoose');
var Schema  = mongoose.Schema;

var commentSchema = new Schema({
    head: {
        type: String,
        required: true
    },
    content: {
        type: String,
        required: true
    }
});

module.exports = mongoose.model('Comment', commentSchema);

我试过了。

app.post("/all_comments/:id", function(req, res) {
        var new_comment = new Comment({
            head: req.body.head,
            content: req.body.content
        });

        Club.findById(req.params.id, function(err, club) {
            var posts = club.posts;
            // console.log(posts);
            for(i in posts) {
                if(posts[i]._id == req.body.id) {
                    console.log(posts[i]);
                    posts[i].comments.push(new_comment);
                    posts[i].save(function(err) {
                        if(err)
                            console.log(err);
                    });
                    club.save(function(err) {
                        if(err)
                            console.log(err);
                        else
                            res.send("Successful");
                    });
                }
            }
        });

    });

我得到的错误

TypeError: Object #<Object> has no method 'save'

Answer 1

您不需要致电posts[i].save()。

完成所有推送后，您只能拨打club.save()一次。

Answer 2

我没有深入研究这一点，但我确实注意到您正尝试使用Comment.Schema访问模型的架构。根据Mongoose文档（http://mongoosejs.com/docs/api.html#model_Model-schema），属性应该是小写的，例如Comment.schema。

尝试将每个记录到控制台，看看你得到了什么。

如何在mongoose中更新子子文档？

2 个答案: