Question

I have to sort a mongodb collection in ruby via the mongodb driver.When I sort in the db directly using

db.zipper.find().sort({"value":-1})

But when I do the same thing in ruby,the collection is not getting sorted.I am using

coll = db.collection('zipper')
coll.find().sort({"value":-1})

Tell me where I am going wrong.I tried with

coll.find.sort(:value,:desc) 

But that too is in vain.Tell me where I am going wrong.

Answer 1

You need to pass the sort options as an array of key value pairs, eg:

 coll.find({}, :sort => ['value',-1])

With the Ruby driver you can also use desc or descending as semantic equivalents for the -1 reverse sort order:

 coll.find({}, :sort => ['value','desc'])
 coll.find({}, :sort => ['value','descending'])