E11000重复键错误集合：housing.posts索引：likes_1 dup键：{喜欢：未定义}

Question

尝试一次将新帖子添加到数据库中，一次添加，第二次则提示错误 发布架构如下

const PostSchema:Schema = new Schema({
    author:{required:true,
      type:mongoose.Schema.Types.ObjectId,
      ref:'User',
    },
    title:{required:false,type:String},
    image:{required:false,type:String,},
    contents:{required:true,type:String},
    tags:{required:false,type:[String]},
    likes:{type:[
      {
        type:mongoose.Schema.Types.ObjectId,
        ref:'User',
      }
    ],
        default:[],
        unique:false,
        required:true
      },
    createdAt:{type:Date,default:Date.now},
    public:{type:Boolean,default:true},
})

发布功能在这里

   request.body.author=request.body.AuthorizedUser.id
   let {author,tags,title,contents}=request.body
   tags=tags?tags:[]
   const data= await PostModel.create({author,tags,title,contents,likes:[]}) 
   response.status(201).json({success: true,data})