流星對集合有獨特的查詢嗎？

Question

我想在我的收藏中返回不同的字段。我知道這些是docs for mongo operators，但我對查詢語言不太瞭解，不知道這是否可行？

Meteor.publish("distinctCollection", function() { 
    return Collection.find({ ... }, fields: { "myField": 1 }); 
}); 

Answer 1

Collection.find({}).distinct('myField', true); 

要使用，放在[項目] /client/lib/a.js如下：

LocalCollection.Cursor.prototype.distinct = function (key,random) { 
    var self = this; 

    if (self.db_objects === null) 
    self.db_objects = self._getRawObjects(true); 
    if (random) 
    self.db_objects = _.shuffle(self.db_objects); 
    if (self.reactive) 
    self._markAsReactive({ordered: true, 
          added: true, 
          removed: true, 
          changed: true, 
          moved: true}); 
    var res = {}; 
    _.each(self.db_objects,function(value){ 

    if(!res[value[key]]){ 
     res[value[key]] = value; 
    } 
    }); 
    return _.values(res); 
};