Ruby: Rename keys in array of hashes? -

how rename _id keys id in array of mongodb documents?

so, want make this:

[{"_id"=>"1", "name"=>"matt"}, {"_id"=>"2", "name"=>"john"}, ...] 

into this:

[{"id"=>"1", "name"=>"matt"}, {"id"=>"2", "name"=>"john"}, ...] 

i found complete solution.

mongo_db['users'].find().to_a.each |u|   u['id'] = u.delete '_id' end.to_json