racerjs - Get count of documents without loading the whole collection in DerbyJS 0.6 -

How can the results of a query be counted without loading the entire result in the memory?

The easy way to calculate the given documents will be:

  var q = model.query ('mycollection', {date: today}); Q.fetch (function () {var length = q.get (). Length;});  

But this will load the whole result in memory and "count" an array in JavaScript. When you have a lot of data, you do not want to do it, I guess.

Built-in mongodb archive is rather complicated by LiveDB (I think it is LiveDB) creates several mongodb documents for a derbyjs document.

International point to this fact from 2013, but there is a description of the solution there (by entering $ count: true query options) 0.6 and work in the current mangodeb. ". query.extraRef is undefined .

This is done as described in the Google Groups thread. But query.extraRef now query.refExtra .

example:

  q.refExtra ('_page.docsOfToday'); q.fetch ();