[译]Mongoose指南 - 验证

时间：2023-03-08 22:04:13

开始前记住下面几点

  • Validation定义在SchemaType中
  • Validation是一个内部的中间件
  • 当document要save前会发生验证
  • 验证不会发生在空值上 除非对应的字段加上了 required validator
  • 可以自定义验证器

内置的验证器

  • 所有的SchemaType都有required验证器
  • Number有min和max验证器
  • String有enum和match验证器

自定义验证器

//确保值是something

function validator(val){

 return val == "something";

}

new Schema({name:{type:String, validate: validator}});

//自定义错误信息

var custom =[validator, '{PATH} does not equal something'];

new Schema({name:{type:String, validate: custome}});

//一次添加多个验证器

var many = [

  {validator:validator, msg:'uh oh'},

  {validator: anotherValidator, msg: 'failed'}

];

new Schema({name: {type:String, validate:many});

//or

var schema = new Schema({name: 'string'});

schema.path('name').validate(validator, "{PATH} {VALUE}");

　　

var toySchema = new Schema({

  color: String,

  name: String

});

var Toy = mongoose.model('Toy', toySchema);

Toy.schema.path('color').validate(function (value) {

  return /blue|green|white|red|orange|periwinkle/i.test(value);

}, 'Invalid color');

var toy = new Toy({ color: 'grease'});

toy.save(function (err) {

  // err is our ValidationError object

  // err.errors.color is a ValidatorError object

  console.log(err.errors.color.message) // prints 'Validator "Invalid color" failed for path color with value `grease`'

  console.log(String(err.errors.color)) // prints 'Validator "Invalid color" failed for path color with value `grease`'

  console.log(err.errors.color.type)  // prints "Invalid color"

  console.log(err.errors.color.path)  // prints "color"

  console.log(err.errors.color.value) // prints "grease"

  console.log(err.name) // prints "ValidationError"

  console.log(err.message) // prints "Validation failed"

});

当验证发生错误的时候, document会有一个erros属性:

toy.errors.color.message == err.errors.color.message

　　

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