Node.js Mongo返回带有分页信息的数据

Question

I am using node and mongo with the native client.

I would like to add pagination to my application.

To get pagination, I need my responses to always return count alongside data

I would like to get something like:

{
   count : 111, 
   data : [ { 'a' : 'only first item was requested' } ]
}

I can do this in mongo

> var guy  = db.users.find({}).limit(1)
> guy.count()
11
> guy.toArray()
[
    {
        "_id" : ObjectId("5381a7c004fb02b10b557ee3"),
        "email" : "myEmail@guy.com",
        "fullName" : "guy mograbi",
        "isAdmin" : true,
        "password" : "fe20a1f102f49ce45d1170503b4761ef277bb6f",
        "username" : "guy",
        "validated" : true
    }
]

but when I do the same with nodejs mongo client I get errors.

var cursor = collection.find().limit(1);
cursor.toArray( function(){ .. my callback .. });
cursor.count(); 

It seems that

• count is not defined on cursor
• that once I applied toArray on cursor, I cannot use the cursor again

How, using nodejs, can I accomplish the same thing I can with mongo directly?

Answer 1

As others have said, if you want to have a total count of the items and then the data you will need to have two queries, there is no other way. Why are you concerned with creating two queries?