javascript – 当嵌套文档存在时,如何验证嵌套文档的属性是否存在？

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user.schema.js

var Schema = require('mongoose').Schema;
var uniqueValidator = require('mongoose-unique-validator');
var _ = require('lodash');

var userSchema = new Schema({
  local: {
    username: String, // should exist when local exists
    role: String,
    hashedPassword: { type: String, select: false }
  },

  facebook: {
    id: String,
    token: { type: String, select: false }
  },

  twitter: {
    id: String,
    token: { type: String, select: false }
  },

  google: {
    id: String,
    token: { type: String, select: false }
  }
});

userSchema.path('local').validate(function(local) {
  var empty = _.isEmpty(local);
  if (empty) {
    return true;
  }
  else if (!empty && local.username) {
    return true;
  }
  else if (!empty && !local.username) {
    return false;
  }
}, 'Local auth requires a username.');

module.exports = userSchema;

我正在尝试在本地不为空时验证用户名是否存在. IE浏览器.使用本地身份验证时,应该存在用户名.

// should validate
user = {
  local: {
    username: 'foo';
    hashedPassword: 'sfsdfs'
  }
};

// shouldn't validate
user = {
  local: {
    hashedPassword: 'sdfsdfs'
  }
};

// should validate (because local isn't being used)
user = {
  local: {},
  facebook {
    ...
  }
};

我收到此错误：

/Users/azerner/code/mean-starter/server/api/users/user.schema.js:51
userSchema.path('local').validate(function(local) {
                        ^
TypeError: Cannot read property 'validate' of undefined

看来你无法获得物体的路径.我学会了here架构有一个路径属性.当我在console.log(userSchema.paths)时：

{ 'local.username':
   { enumValues: [],
     regExp: null,
     path: 'local.username',
     instance: 'String',
     validators: [],
     setters: [],
     getters: [],
     options: { type: [Function: String] },
     _index: null },
  'local.role':
   { enumValues: [],
     regExp: null,
     path: 'local.role',
     instance: 'String',
     validators: [],
     setters: [],
     getters: [],
     options: { type: [Function: String] },
     _index: null },
  'local.hashedPassword':
   { enumValues: [],
     regExp: null,
     path: 'local.hashedPassword',
     instance: 'String',
     validators: [],
     setters: [],
     getters: [],
     options: { type: [Function: String], select: false },
     _index: null,
     selected: false },
  'facebook.id':
   { enumValues: [],
     regExp: null,
     path: 'facebook.id',
     instance: 'String',
     validators: [],
     setters: [],
     getters: [],
     options: { type: [Function: String] },
     _index: null },
  'facebook.token':
   { enumValues: [],
     regExp: null,
     path: 'facebook.token',
     instance: 'String',
     validators: [],
     setters: [],
     getters: [],
     options: { type: [Function: String], select: false },
     _index: null,
     selected: false },
  'twitter.id':
   { enumValues: [],
     regExp: null,
     path: 'twitter.id',
     instance: 'String',
     validators: [],
     setters: [],
     getters: [],
     options: { type: [Function: String] },
     _index: null },
  'twitter.token':
   { enumValues: [],
     regExp: null,
     path: 'twitter.token',
     instance: 'String',
     validators: [],
     setters: [],
     getters: [],
     options: { type: [Function: String], select: false },
     _index: null,
     selected: false },
  'google.id':
   { enumValues: [],
     regExp: null,
     path: 'google.id',
     instance: 'String',
     validators: [],
     setters: [],
     getters: [],
     options: { type: [Function: String] },
     _index: null },
  'google.token':
   { enumValues: [],
     regExp: null,
     path: 'google.token',
     instance: 'String',
     validators: [],
     setters: [],
     getters: [],
     options: { type: [Function: String], select: false },
     _index: null,
     selected: false },
  _id:
   { path: '_id',
     instance: 'ObjectID',
     validators: [],
     setters: [ [Function: resetId] ],
     getters: [],
     options: { type: [Object], auto: true },
     _index: null,
     defaultValue: [Function: defaultId] } }

所以看起来像local.username和facebook.token这样的路径存在,但不存在像本地和facebook这样的“顶级”路径.

如果我尝试验证local.username路径,它不会像我想要的那样工作.

userSchema.path('local.username').validate(function(username) {
  return !!username
}, 'Local auth requires a username.');

仅当local.username存在时才应用验证.我想验证它是否存在.因此,当它不存在时,验证不会被应用,因此它被认为是有效的并被保存.

我也尝试了以下方法,但结果与local.username方法相同(当用户名不存在时,验证不会被点击,并且它被标记为有效).

var Schema = require('mongoose').Schema;
var uniqueValidator = require('mongoose-unique-validator');
var _ = require('lodash');

var userSchema = new Schema({
  local: {
    username: {
      type: String,
      validate: [validateUsernameRequired, 'Local auth requires a username.']
    },
    role: String,
    hashedPassword: { type: String, select: false }
  },

  facebook: {
    id: String,
    token: { type: String, select: false }
  },

  twitter: {
    id: String,
    token: { type: String, select: false }
  },

  google: {
    id: String,
    token: { type: String, select: false }
  }
});

function validateUsernameRequired(username) {
  return !!username;
}

module.exports = userSchema;

解决方法:

Adam,你为什么不尝试一个有条件地将错误传递给下一个函数的预验证钩子.我认为这将为您提供所需的灵活性.如果它不起作用,请告诉我.

例如

schema.pre('validate', function(next) {
  if(/*your error case */){ next('validation error text') }
  else { next() }
})

这将导致mongoose将ValidationError发送回试图保存文档的任何人.

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