Using setter in Mongoose

According to mongoose.js doc, it is able to set setters to a field on schema.
However, the doc is not quite detailed and obselete.
Some example:

var schema=new Schema({
  password:{
    type:String,
    required:true,
    set:hash
  }
})

function hash(plainPwd){
  return require("crypto").createHash("sha1").update(plainPwd).update(secret).digest("hex");
}

The hash will be called mainly on following scenarios:

• When a new doc being created.

  model.create({password:"12345"}) //password will be hashed

• When set a value to a doc.

  doc.password="22222" // 22222 will be hashed

However, this will not work for update query:

model.update({_id:<id>},{$set:{password:"12345"}}) // password will not be hashed
model.findOneAndUpdate
model.findAndUpdate

For password, it is able to write beforeUpdateHook

schema.methods.beforeUpdateHook=function(data){
  if (!data || this.password === data.password){
    return ;
  }
  if (data.password){
    data.password=hash(data.password);
  }
}