I have an array of hashes, something like
[ {:type=>"Meat", :name=>"one"},
{:type=>"Meat", :name=>"two"},
{:type=>"Fruit", :name=>"four"} ]
and I want to convert it to this
{ "Meat" => ["one", "two"], "Fruit" => ["Four"]}
I tried group_by
but then i got this
{ "Meat" => [{:type=>"Meat", :name=>"one"}, {:type=>"Meat", :name=>"two"}],
"Fruit" => [{:type=>"Fruit", :name=>"four"}] }
and then I can't modify it to leave just the name and not the full hash. I need to do this in one line because is for a grouped_options_for_select
on a Rails form.
array.group_by{|h| h[:type]}.each{|_, v| v.replace(v.map{|h| h[:name]})}
# => {"Meat"=>["one", "two"], "Fruit"=>["four"]}
Following steenslag's suggestion:
array.group_by{|h| h[:type]}.each{|_, v| v.map!{|h| h[:name]}}
# => {"Meat"=>["one", "two"], "Fruit"=>["four"]}