7、验证信息

const mongoose=require('mongoose')

mongoose.connect("mongodb://localhost/playground",{ useNewUrlParser: true,useUnifiedTopology: true})
.then(()=>{console.log("数据库连接成功")})
.catch(err=>{console.log(err,'数据库失败')})
const postSchema=new mongoose.Schema({
    title:{
        type:String,
        //必选字段
        required:[true,'请输入字符串'],
        //最小长度与最大长度
        minlength:3,
        maxlength:11,
        //去除字符串两边空格
        trim:true
    },
    age:{
        type:Number,
        //数字的最小范围和最大范围
        min:18,
        max:100
    },
    publishDate:{
        type:Date,
        //默认值
        default:Date.now
    },
    category:{
        type:String,
        //列举出当前字段可以拥有哪些值
        enum:['java','node.js','javascript','zg']
    },
    author:{
        type:String,
        //自定义验证
        validate:{
            //v是用户输入的值
            validator:v=>{
                //true为验证通过，false为验证失败
                return v&&v.length>5
            },
            //自定义错误信息
            message:'传入的值不符合验证规则'
            
        }
    }
});
const Post=mongoose.model("Post",postSchema);
Post.create({title:"zhanggong",age:20,category:"java",author:"rrrr"}).then(res=>{console.log(res)})