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Pagination with MongoDB in Node.js (With Sorting)


Pagination with MongoDB in Node.js (With Sorting)

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Pagination with MongoDB in Node.js (With Sorting)
Tag : javascript , By : Monev
Date : November 29 2020, 09:01 AM

around this issue You can sort and filter on a combination of fields that together uniquely identify documents. For example, sort on {viewcount: 'descending', _id: 'ascending'}, and filter on {viewcount <= last_view_count, _id > last_id}.

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example code of sorting & pagination in map reduce mongodb


Tag : mongodb , By : yew tree
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further MapReduce is the wrong tool for this. You can implement pagination by chaining a normal find-query with sort, skip and limit.
To query the documents 101-120 by datefrom a collection, use this:
db.collection.find().sort(date: -1).skip(100).limit(20);

Mongodb aggregation skip and limit with sorting bring duplicate records in pagination


Tag : mongodb , By : krs
Date : March 29 2020, 07:55 AM
this one helps. It looks like the three fields you're sorting by are not unique and therefore the order can be different in subsequent executions. To fix that you can add additional field to your $sort. Since _id is always unique it can be a good candidate. Try:
{"$sort":{
    "isFeatured":-1,
    "refreshes.refreshAt":-1,
    "publishDate":-1,
    "_id": -1
}}

How to index and sorting with Pagination using custom field in MongoDB ex: name instead of id


Tag : mongodb , By : helloedwin
Date : March 29 2020, 07:55 AM
hope this fix your issue https://scalegrid.io/blog/fast-paging-with-mongodb/ , Answer to your question is
db.Example.createIndex( { name: 1, company: 1 } )
db.Example.find({name = "John", country = "Ireland"}). limit(10);
db.Example.find().sort({"name" = 1, "country" = 1}).limit(userPassedLowerLimit).skip(userPassedUpperLimit);
db.Example.find().sort({"name" = 1, "country" = 1}).limit(30).skip(20);
db.collection.createIndex( <key and index type specification>, <options> )
db.collection.createIndex( { name: -1 } )

Query mongoDB sorting by array value and using pagination in Springdata MongoDB


Tag : java , By : Rb.Ridge
Date : March 29 2020, 07:55 AM
I hope this helps . It worked successfully with this expression sortBy = "programInstance.title.descriptions.0.value";

How to implement Cursor based pagination for mongodb in node.js using official mongodb client when _id is overrided?


Tag : node.js , By : Karina
Date : March 29 2020, 07:55 AM
seems to work fine I don't think you have much to do.
You have by default an index on _id and according to mongodoc, the field you index can be a whole embedded document whose (sub) fields order matters.
arr = Array(25).fill(0).map((x,i)=>i).sort(x=>Math.random()-0.5).map(x=>[(x-x%5)/5,x%5])
arr.forEach(([mtid, uid],i)=>db.dums.insert({_id:{mtid, uid},n:i}))
{ "_id" : { "mtid" : 2, "uid" : 4 }, "n" : 0 }
{ "_id" : { "mtid" : 2, "uid" : 2 }, "n" : 1 }
{ "_id" : { "mtid" : 0, "uid" : 1 }, "n" : 2 }
{ "_id" : { "mtid" : 0, "uid" : 0 }, "n" : 3 }
{ "_id" : { "mtid" : 0, "uid" : 2 }, "n" : 4 }
{ "_id" : { "mtid" : 2, "uid" : 3 }, "n" : 5 }
{ "_id" : { "mtid" : 3, "uid" : 1 }, "n" : 6 }
...
function query(str){
  let [mtid, uid] = str.split('_')
  mtid = parseInt(mtid)
  uid = parseInt(uid)

  const res = db.dums.find({
    _id: {
      $gt: { mtid, uid }
    }
  }).limit(2).sort({ _id: 1 }).toArray()

  if(!res.length) return {items:[], next:null}
  const last = res[res.length-1]._id
  const next = last.mtid + '_' + last.uid
  print(res.map(x=>x._id.mtid+'_'+x._id.uid).join(';'))
  return {
    items: res,
    next,
    goNext(){return query(next)}
  }
}
> var a=query('0_0');
0_1;0_2
> var a=a.goNext();
0_3;0_4
> var a=a.goNext();
1_0;1_1
> var a=a.goNext();
1_2;1_3
> var a=a.goNext();
1_4;2_0
> var a=a.goNext();
2_1;2_2
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