Question

例如，我有50个用户，我有像

这样的集合

Rooms = new Mongo.Collection('rooms');

首先，我想混合用户，如果我有[id1,id2,id3...]这样做[id52,id91241,id2...]

并且在每个Room 5个用户之后输入

for (i=0;i<countofmyusers;i=i+5)
   crete new room and put 5 users // ?? how .. Rooms.insert(??)

 { 
    users: [id1,id44,id2451,id921241,id23]
    ...
 }

知道该怎么做吗？

Answer 1

这是一个创建一组房间的示例函数，每个房间都有一个随机的用户样本：

var randomRooms = function(roomCount, sampleSize) {
  // extract all of the user ids in the datbase
  var userIds = _.pluck(Meteor.users.find({}, {fields: {_id: 1}}).fetch(), '_id');

  // create roomCount rooms
  _.times(roomCount, function() {
    // insert a new room with a random sample of users of size sampleSize
    Rooms.insert({users: _.sample(userIds, sampleSize)});
  });
};

这是一个新版本，强制用户ID不会在群组之间重复（即每个用户将被分配到一个且只有一个群组）：

var randomRooms = function(userCountInEachRoom) {
  // extract all of the user ids in the datbase
  var userIds = _.pluck(Meteor.users.find({}, {fields: {_id: 1}}).fetch(), '_id');

  // create a new array of randomly sorted user ids
  var shuffledUserIds = _.shuffle(userIds);

  // create a list of lists of user ids where each list has at most
  // userCountInEachRoom ids - note that users will not be repeated in any lists
  var userLists = [];
  while (shuffledUserIds.length > 0)
    userLists.push(shuffledUserIds.splice(0, userCountInEachRoom));

  // insert a new group for each sub-array of user ids
  _.each(userLists, function(users) {
    Rooms.insert({users: users});
  });
};

您可以将其称为randomRooms(5)，以便在每个组中放置最多五个用户。请注意，如果总用户数不是五的倍数，则最后一个组的用户数将少于五个。

用户在Meteor Js中循环

1 个答案: