Displaying MongoDB results in chartkick using ruby on rails

Question

I have this output from a query in MongoDB using Ruby :

irb(main):087:0>   data = col.find({}, :fields => ["result", "time"])
=> <Mongo::Cursor:0x14768b8 namespace='spark.light' @selector={} @cursor_id=>

irb(main):090:0> data.first
=> {"_id"=>BSON::ObjectId('537d961197c20960ad000001'), "result"=>2177, "time"=>2014-05-22 06:15:45 UTC}

Now I want to give this data to chartkick running on Ruby on Rails to draw a linechart .The input shall looks like this :

"2014-05-22 06:15:45 UTC" => "2177"

Is there any clean way to do that ?

Answer 1

This would transform records into a hash of time => result :

Hash[data.map do |item|
  [item['time'], item['result']]
end]

# => { 2014-05-22 06:15:45 UTC => 2177, 2014-05-22 06:20:00 UTC => 1000 }

Answer 2

将Hash#values_at与Hash::[]方法一起使用：

Hash[data.first.values_at('time', 'result')]