如何仅在第一次出现时深度转换哈希/数组中的键或值

您可以创建 done 布尔值,用于跟踪是否已经完成替换,并从块中返回适当的值:

require "active_support/core_ext/hash/deep_transform_values"

def deep_transform_values_once(hash:, old_value:, new_value:)
  done = false
  hash.deep_transform_values do |value|
    if !done && value == old_value
      done = true
      new_value
    else
      value
    end
  end
end

input = {
  "books2" => [1, { a: 1, b: "seller35" }],
  "books3" => { "a" => [{ "5.5" => "seller35", "6.5" => "foo" }] },
}

p deep_transform_values_once(hash: input, old_value: "seller35", new_value: "")

输出:

{"books2"=>[1, {:a=>1, :b=>""}], "books3"=>{"a"=>[{"5.5"=>"seller35", "6.5"=>"foo"}]}}