I have a firebase database with a collection called lines. I’m trying to get the total count of line records. I initially tried this:

const count = firestore.collection('lines').get().then(snapshot => snapshot.docs.length);

…but this forces firebase to read all the line records.

I’m wondering if there’s a quicker, less expensive way to get the record count.

I tried this:

const count = firestore.collection('lines').count();

This gives me this object:

{
   "_query":{
      "_firestore":{
         "projectId":"xxx-12345"
      },
      "_queryOptions":{
         "parentPath":{
            "segments":[
               
            ]
         },
         "collectionId":"lines",
         "converter":{
            
         },
         "allDescendants":false,
         "fieldFilters":[
            
         ],
         "fieldOrders":[
            
         ],
         "kindless":false,
         "requireConsistency":true
      },
      "_serializer":{
         "allowUndefined":false
      },
      "_allowUndefined":false
   },
   "_aggregates":{
      "count":{
         
      }
   }
}

…but I don’t see the count anyway in here (except for count but it’s an empty object).

What is the best way to get the record count from a firebase collection with as few reads as possible?

Thanks!