Mongodb query use skip and limit function in first N documents - mongodb

Question

Can we make query which enable us to use skip and limit in first N documents?
Ex :
Suppose there are nearly 500 documents in a collection called teachers.
I want a query which restrict me to read first 300 documents only.
If I use skip(300) in that query it should display null.
db.teachers.find().pretty()
{
id : 1,
name : "teach001"
},
{
id : 2,
name : "teach002"
},
{
id : 3,
name : "teach003"
},
{
id : 4,
name : "teach004"
},
{
id : 5,
name : "teach005"
},
{
id : 6,
name : "teach006"
},
{
id : 7,
name : "teach007"
},
{
id : 8,
name : "teach008"
},
{
id : 9,
name : "teach009"
},
{
id : 10,
name : "teach0010"
}
db.teachers.find({some query here to restrict access first 5 documents only }).skip(5).limit(5).pretty()

Answer 1

Aggregation
I don't think there is a way to do exactly what you are requesting. If you are open to using the aggregation framework, it can be accomplished easily.
db.teachers.aggregate([{$limit: 5}, {$skip: 5}])
View
If you are open to creating a view, you could even create a view that enforces the limit
db.createView('limitedTeachers', 'teachers', [{$limit: 5}])
Then you can use find on the view:
db.limitedTeachers.find({}).skip(5)
Two finds
If you cannot use aggregation, you have the option of using 2 finds in your query. First, find the n number of Object IDs. Then, limit your second query to only those Object IDs.
var ids = [];
db.teachers.find({}, {_id: 1}).limit(5).forEach(function(doc){
ids.push(doc._id);
});
db.teachers.find({ _id: {$in: ids} }).skip(5)
Or as the same type of query but closer to the format you had in your question
db.teachers.find({$or: db.teachers.find({}, {_id: 1}).limit(5).toArray()}).skip(5)