article: { _id: 42, title: "Xdebug saves you time!" }
comments:
{
_id: 42,
page: 0,
comments: [
{ ts: 1332942067, author: "Derick", comment: "It also costs a lot of time to write!" },
{ ts: 1332942118, author: "...", comment: "..." },
...
]
},
{
_id: 42,
page: 1,
comments: [
{ ts: 1332942261, author: "Derick", comment: "blah blah" },
{ ts: 1332942482, author: "...", comment: "..." },
]
}