为什么这个Node.js插件，Mongoose，不起作用？我遵循了所有指示

Question

mongoose.connect('mongodb://localhost/guesswho');
var Schema = mongoose.Schema;
var Message = new Schema({
    author: { type:String },
    body: { type:String },
});
var MessageModel = mongoose.model("Message");

我按照这里的每条指示：https://github.com/LearnBoost/mongoose

但是我在运行时遇到此错误：Error: Schema hasn't been registered for model "Message".

我甚至试过这个：var MessageModel = mongoose.model("Message", Message); 当我这样做时......没有错误。但是，MessageModel未定义。

Answer 1

修正：

var Message = new Schema({
    author: { type:String },
    body: { type:String },
});
mongoose.model("Message",Message);
var MessageModel = mongoose.model("Message");
var aMessage = new MessageModel();
aMessage.author = "apple";
aMessage.body = "orange";
aMessage.save(function(e){

});

来自IRC的人称coreb修复了它。