{
"_id" : "1249",
"auth" : {
"_id" : "admin",
"name" : "admin"
},
"content" : "亡官方的冷漠反应",
"title" : "在上海一家外企工作。",
"theme" : "bug",
"dtype" : "all",
"reply" : [
{
"discussname" : {
"_id" : "wzb",
"name" : "wzb"
},
"content" : "\t无言",
"createtime" : ISODate("2004-08-03T15:05:00.000Z"),
"floor" : "1",
"reply" : [
{
"replyname" : {
"_id" : "123",
"name" : "123"
},
"author" : "",
"content" : "不错哦",
"createtime" : ISODate("2016-01-13T08:08:10.081Z")
},
{
"replyname" : {
"_id" : "123",
"name" : "123"
},
"author" : "",
"content" : "jiayouo",
"createtime" : ISODate("2016-01-13T09:27:10.881Z")
},
{
"replyname" : {
"_id" : "123",
"name" : "123"
},
"author" : "回复 123",
"content" : "nihao",
"createtime" : ISODate("2016-01-13T09:27:25.681Z")
}]
},{
"discussname" : {
"_id" : "123",
"name" : "123"
},
"floor" : "2",
"content" : "好帅",
"createtime" : ISODate("2016-01-16T11:04:07.917Z"),
"reply" : [
{
"replyname" : {
"_id" : "123",
"name" : "123"
},
"author" : "",
"content" : "很好",
"createtime" : ISODate("2016-01-16T11:05:21.036Z")
}
]
}
}像上面的字段，我這樣查詢：
db.getCollection('tribune').find({"_id":"1249"},{"reply":{"$elemMatch":{"floor":"1"}}})取出來的裡面的reply數組（就叫 A 吧），現在我想取數組A的前兩個字段，要怎麼做？
