为什么这个Node.js插件,Mongoose,不起作用？我遵循了所有指示

固定:

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.

固定:

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.