Question

您好我想创建一个散列，如果该名称存在于其他散列中，则该散列将附加名称的电子邮件。我相信会有一小段代码可以完成红宝石的魔力。

Input

a = [
  {"email"=>"foobar@gmail.com", "name"=>"Adam"}, 
  {"email"=>"test@gmail.com",   "name"=>"John"}, 
  {"email"=>"hello@gmail.com",  "name"=>"Adam"}
]



Output
a = [
  {"email"=>"foobar@gmail.com", "name"=>"Adam | foobar@gmail.com"}, 
  {"email"=>"test@gmail.com",   "name"=>"John"}, 
  {"email"=>"hello@gmail.com",  "name"=>"Adam | hello@gmail.com "}
]

Answer 1

这是另一种选择：

# get names
names = a.map {|e| e['name'] }
# find duplicates
duplicates  = names.detect {|e| names.count(e) > 1 }
# append email to duplicates
a.each { |e| e['name'] = "#{e['name']} | #{e['email']}" if duplicate.include?(e['name'])}

Answer 2

鉴于您的输入

a = [
  {"email"=>"foobar@gmail.com", "name"=>"Adam"}, 
  {"email"=>"test@gmail.com",   "name"=>"John"}, 
  {"email"=>"hello@gmail.com",  "name"=>"Adam"}
]

我将提供一个巧妙命名的我自己的比较哈希

b = [
  {"name"=>"Adam"},
  {"name"=>"Adam"}
]

这是你的红宝石魔法

a.map do |hash_a|
  # This is the 'magic' line that compares the values of
  # the two hashes name values
  if b.any? { |hash_b| hash_b['name'] == hash_a['name'] }
    hash_a['name'] << " | #{hash_a['email']}"
    hash_a
  else
    hash_a
  end
end

输出：

[
  {
    "email" => "foobar@gmail.com",
     "name" => "Adam | foobar@gmail.com"
  },
  {
    "email" => "test@gmail.com",
     "name" => "John"
  },
  {
    "email" => "hello@gmail.com",
     "name" => "Adam | hello@gmail.com"
  }
]

将值附加到重复哈希

2 个答案: