预删除钩子正在触发但不删除引用（猫鼬）

Question

我在＆＃34; catch schema＆＃34;中添加了一个预删除钩子。删除＆＃34;位置架构中的所有引用。＆＃34;

这是我的捕捉模型：

var mongoose = require("mongoose");

var catchSchema = mongoose.Schema({
    species: String,
    weight: String,
    image: String,
    catchlocation: String,
    catchlocationid: String,
    description: String,
    timePosted: { type: Date, default: Date.now },
    author: {
        id: {
            type: mongoose.Schema.Types.ObjectId,
            ref: "User"
        },
        username: String
    }
},
   {timestamps: true}
);

catchSchema.pre("remove", function(next) {
    console.log("The remove function has fired");
        Location.remove({ catches: this._id }, 
       next);
});

module.exports = mongoose.model("Catch", catchSchema);

以下是持有参考文献的位置模式：

var locationSchema = new mongoose.Schema({
    name: String,
    gps: String,
    thumbnail: String,
    image: String,
    description: String,
    catches: [
        {
            type: mongoose.Schema.Types.ObjectId,
            ref: "Catch"
        }
        ]
});

var Location = mongoose.model('Location', locationSchema);

这里奇怪的是删除＆＃34; catch＆＃34;正在触发pre-remove钩子，但是没有删除引用的ObjectId。