使用MongoDB从Golang中的子对象数组获取值

问题描述：

I am using the mgo.v2 driver with the latest version of MongoDB installed. My document structure is defined like this:

type gameTemplate struct {
ID       bson.ObjectId `bson:"_id" json:"id"`
GameCode string        `bson:"gamecode" json:"gamecode"`
Players  []player      `bson:"players" json:"players"`
}

type player struct {
PlayerID bson.ObjectId `bson:"playerid" json:"playerid"`
Username string        `bson:"username" json:"username"`
Level    int           `bson:"level" json:"level"`
}

How would I go about getting a list of usernames in a particular game (Defined by gamecode)?

Is there a way to get the size of the array and iterate through the elements, or is there a preferred method?

我正在使用安装了最新版本MongoDB的mgo.v2驱动程序。我的文档结构定义如下： p>

  type gameTemplate结构{
ID bson.ObjectId`bson：“ _ id” json：“ id”`
GameCode字符串`bson：“  gamecode“ json：” gamecode“`
Players [] player`bson：” players“ json：” players“`
} 
 
type player struct {
PlayerID bson.ObjectId`bson：” playerid“ json：” playerid  “`
用户名字符串`bson：”用户名“ json：”用户名“`
Level int`bson：” level“ json：” level“`
} 
  code>  pre> 
 
 如何获取特定游戏中的用户名列表（由 gamecode  code>定义）？   p> 
 
 是否有一种获取数组大小并遍历元素的方法，还是有一种首选的方法？   p> 
  div>

答

you could get all player with specific game code like this:

players := []gameTemplate{}
err = session.DB(DBname).C(Colloctionname).Find(bson.M{}).All(&players)

as you defined each players has username and size of players slice is the number of username which has specific game code.

ps:
be careful and change DBname and Colloctionname whit your Database and collection name and use session of your databse connection be

使用MongoDB从Golang中的子对象数组获取值

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