Question

我正在我的网站上投票系统。我有用户模型，用于存储表示用户投票的用户信息（名称，密码，设置等）和投票模型。我应该存储什么以及如何在民意调查模型中创建民意调查，用户只能投票一次？我在下一个架构中结束了：

yesOption: {
    username: String,
    votes: [String] // Array of voted usernames 
}, 
noOption: {
    username: String,
    votes: [String],  
},
startDate: Date

Answer 1

//1. User
var UserSchema = new mongoose.Schema({
    username: {type: String, lowercase: true},
    email: {type: String, lowercase: true}
});

//2. Pool
var PoolSchema = new mongoose.Schema({
    rating: {type: Number, default: 0},
    votedNumber: {type: Number, default: 0}
});

//3. Voted
var VotedSchema = new mongoose.Schema({
    pool: {type: mongoose.Schema.Types.ObjectId, ref: 'Pool'}
    user: {type: mongoose.Schema.Types.ObjectId, ref: 'User'},
    rank: Number, //rank could be -1 and 1 (-1 is no and 1 is yes) or 0-5
    updatedAt: Date
});

如果用户已经为此池投票，您可以更新Voted对象和Pool对象。但通常允许用户投票一次。

此外，要计算Pool的评级，您不必从数据库中选择所有Voted文档。可以在1或2个数据库请求中重新计算它：

if (('undefined' != typeof pool.votedNumber && pool.votedNumber) ||
    ('undefined' != typeof pool.rating && pool.rating)) {

    //Calculate new rating for a pool
    var numNewRating = ((pool.rating * pool.votedNumber) + newRank) / (pool.votedNumber + 1);
    place.votedNumber += 1;
    place.rating = parseFloat(numNewRating);

} else {
    //Pool is the first time ranked
    place.rating = parseFloat(newRank);
    place.votedNumber = 1;
}

使用MongoDB组织投票系统

1 个答案: