count's performance problem

[reasonMix]

i reference the mongodb's c driver，query the collection's count,can use the 'count' command,but in your driver use the query and get the length of the documents for this,maybe this is a performance problem

[cyrilis]

Hi @reasonMix ,
You can use count method in Cursor, it use count command to query the count of documents.
like this:

local postsCollection = db:collection("posts")
postsCollection:find({posted = true}):count(function(count) 
    p(count)
end)

I'll fix count method in db:count later (I must forget to refactor this.).

[reasonMix]

@cyrilis OK