Retrieving a Subset of Fields from MongoDB in Ruby
The query should look like
collection.find(selector = {}, opts = {})In your case it is
coll.find({"title" => 'Halo'}, {:fields => ["title", "isrc"]})But still remains a problem, the ruby-driver ignores the condition of "fields", and returns all the fields! :\
This query will return only the title and isrc for a doc that has the title "Halo":
coll.find({"title" => 'Halo'},{:fields => {"_id" => 0, "title" => 1, "isrc" => 1}})Note the use of a Hash for the fields where the keys are the field names and the values are either 1 or 0, depending on whether you want to include or exclude the given field.