Firestore + AngularFire2 pagination ( query items by range - .startAfter(lastVisible) )

Question

In a component I want to pull a range of items from FireStore, for ex. from 0 to 5, from 5 to 10 etc. I found this in FireStore\'s docs, but they dont use AngularFire2 so as

Answer 1

I don't know about FireBase, but I'am awesome when you ask about all the items and then filtered.

If you make a method that has as arguments, page and size and an array lastScore I supouse that you can make some like (NOTE: I have NOT Firestone and, the most probably, I'm wrong and the code is bad)

//In service

lastScores:number[]=[];
lastPage:number=0; //use to know where you reach the last page
getNextHightScores(page:number,count:number)
{
    //get the limit
    let last=page>0?lastScores[page-1]:999999999   //if page=0 a bigger score
    //use where and limit
    return afs.collection('scores', r =>  
            r.where("score", "<", last).orderBy("score","desc").limit(count)
            .valueChanges()
            .do(r=>{  //using do to store the lastScore
               if (r.length)
                   this.lastScore[page]=r[r.length-1].score;
               if (r.length{console.log(r)})
}
//and 
next scores