Question

以下响应由外部API返回，并分配给ret_val：

{:val1=>"add", :val2=>"delete", :val3=>"update"}
{:val1=>"add_name", :val2=>"delete_name", :val3=>"update_name"}
{:val1=>"add_city", :val2=>"delete_city", :val3=>"city"}

我想将ret_val转换为数组，以便通过提供val1来提取分配给val2，val3和val1的值， val2和val3。所以我基本上希望看到所有逗号分隔对的键值和值对。预期产出：

val1 : add
val2 : delete
val3:update

直到API返回的最后一行。请建议。注意：API将始终仅使用重复键以上述格式返回响应。

Answer 1

更新的答案：如果您只想在JSON中重现相同的结构，可以使用Ruby JSON module

require 'json'

ret_val = [
    { :val1 => "add", :val2 => "delete", :val3 => "update" },
    { :val1 => "add_name", :val2 => "delete_name", :val3 => "update_name" },
    { :val1 => "add_city", :val2 => "delete_city", :val3 => "update_city" }
]

puts ret_val.to_json
# => [{"val1":"add","val2":"delete","val3":"update"},{"val1":"add_name","val2":"delete_name","val3":"update_name"},{"val1":"add_city","val2":"delete_city","val3":"update_city"}]

如果需要重新构造结构，则需要迭代响应数组中的哈希值，例如使用Array#each。您可以将块与函数关联，并为阵列中的每个条目执行块。为了说明，让我们看一下my_array = ["one", "two", "three"]

my_array = ["one", "two", "three"]
my_array.each do |e|
  # e is the current entry
  puts "The current entry is '#{e}'"
end

输出为

The current entry is 'one'
The current entry is 'two'
The current entry is 'three'

以同样的方式，你可以迭代你从API获得的数组中的哈希值，并像你想要的那样处理每个哈希值

ret_val = ... # same as above
ret_val.each do |hash|
  # do whatever you need to do with 'hash'
end

您正在寻找的内容可能是Hash#values

my_hash = {:val1=>"add", :val2=>"delete", :val3=>"update"}
my_hash.values # => ["add", "delete", "update"]

Answer 2

下面的代码片段会给你想要的结果：

#ret_val=calling API
ret_val.each { |x|  
x.each { |val| 
puts "#{val[0]} :#{val[1]}"
}
}

Answer 3

API返回的是哈希。您可以通过其密钥访问哈希值。

ret_val = func()

ret_val是一个哈希对象。要访问其值

a = Array.new()
ret_val.each { |key,value| a << value }

哈希到阵列转换

3 个答案: