Firestore Pagination : how to set Cursor for startAt using Rest Api - firebase

Question

I'm using firebase firestore using Rest API to get data limited by 5 documents only, ordered by a field called LikesCount.
When I want to fetch the next 5 documents I have to use startAt and pass the LikesCount value of the last document from the first 5 documents.
But in this way, it will fetch wrong data when there is another document with the same LikesCount value So I tried and searched a lot about how to pass the last Document id in addition to the LikesCount value But all of them did not work In addition, I tested the pagination using the Web SDK and it was working correctly because you can pass the document snapshot easily, but what does the document snapshot object include? So that we can understand the structure of the Cursor and apply it to the REST API.
I tried to use this method to pass the Document ID as referenceValue
{
"structuredQuery": {
"from": [{
"collectionId": "Users"
}],
"where": {
"compositeFilter": {
"op": "AND",
"filters": []
}
},
"orderBy": [{
"field": {
"fieldPath": "LikesCount"
},
"direction": "DESCENDING"
}],
"startAt":
{ "values": [
{
"integerValue": "6"
},
{
"referenceValue": "projects/myprojectid/databases/(default)/documents/Posts/xEvmJ1LLHwTKVREQfXtX"
}
],
"before": false
},
"limit":5
}
}
But an error will occur : Cursor has too many values.
also, I tried to pass only the referenceValue and it still did not return the correct 5 documents.
Thanks in advance :)

Answer 1

Your orderBy() has 1 field (LikesCount) but your startAt() has 2 fields. I suspect that is the reason for the error message?
Passing the integerValue won't work. If there are 13 results with the value 6, then each time you make the above call you'd get the same first 5 results.
When you say:
I tried only passing the referenceValue and still did not get the correct 5 documents
what documents are you getting? What documents were you expecting to get?