数组有两个哈希需要第二个哈希键值对

Question

我需要简短的方法来找到我从这个

获得的相同回复

k = [
  {"child_category"=>{"name"=>"Acrylic Fiber", "id"=>3405}},
  {"child_category"=>{"name"=>"Aramid Fiber", "id"=>3406}}
] 
o = []
m = k.select!{| i| o << i["child_category"]}

o
#=> [{"name"=>"Acrylic Fiber", "id"=>3405}, {"name"=>"Aramid Fiber", "id"=>3406}]

Answer 1

使用Array#map

k.map {|h| h['child_category']}
# => [{"name"=>"Acrylic Fiber", "id"=>3405}, {"name"=>"Aramid Fiber", "id"=>3406}]

Answer 2

您可以使用Array#flat_map和Hash#values：

=> hash = [{"child_category"=>{"name"=>"Acrylic Fiber", "id"=>3405}}, {"child_category"=>{"name"=>"Aramid Fiber", "id"=>3406}}] 
=> hash.flat_map(&:values)
=> [{"name"=>"Acrylic Fiber", "id"=>3405}, {"name"=>"Aramid Fiber", "id"=>3406}]