node.js - Mongoose 虚拟不工作

Question

我有一个 mongoose Schema 调用用户名，我正在尝试在虚拟中连接用户名。当我在 get 中记录虚拟或在这些模型中执行函数时，它返回未定义。

我引用了文档，那里的例子是嵌套模型，我更喜欢当前模型而不是嵌套它。我希望任何人都可以帮助我。

const Schema = mongoose.Schema;
const UserSchema = new Schema({ 
firstname: {
type: String,
lowercase: true,
required: true
},
lastname: {
type: String,
lowercase:true,
text: true,trim: true,
required: true},
middlename: {
type: String,
text: true,trim: true,
lowercase: true
 }
  UserSchema.virtual('fullname')
.get(function(){
  return this.firstname + ' ' + this.lastname;
})
.set(function(firstname, lastname) {
  firstname = this.firstname;
  lastname = this.lastname;
});
UserSchema.set('toObject', {virtuals: true});
UserSchema.set('toJSON', {virtuals: true});
  });
  const User = module.exports = mongoose.model('User', UserSchema);

Answer 1

试试这个:

const Schema = mongoose.Schema
const UserSchema = new Schema({ 
  firstname: {
    type: String,
    lowercase: true,
    required: true
  },
  lastname: {
    type: String,
    lowercase:true,
    text: true,
    trim: true,
    required: true
  }
})

UserSchema.set('toObject', { virtuals: true })
UserSchema.set('toJSON', { virtuals: true })

UserSchema.virtual('fullname')
  .get(function() {
    return this.firstname + ' ' + this.lastname
  })
  .set(function(newName) {
    var nameParts = newName.split(' ')
    this.firstname = nameParts[0]
    this.lastname = nameParts[1]
  })

const User = module.exports = mongoose.model('User', UserSchema)

然后您应该能够执行此操作:

var somebody = new User({
  firstname: 'Some',
  lastname: 'Body'
})

somebody.save(function(err, doc) {
  console.log(somebody.fullname) // Some Body

  doc.fullname = 'Another Person'

  doc.save(function(err, doc) {
    console.log(doc.fullname) // Another Person
  })
})

希望对您有所帮助。