Question

我有一个哈希：

@table = [
  {"country" => "england", "home" => "team a", "away" => "team b"},
  {"country" => "england", "home" => "team c", "away" => "team d"}
]

我想：

<div class="row">
england
</div>
<div class="row">
team a vs team b
</div>
<div class="row">
team c vs team d
</div>

我运行了这段代码：

<% table.each do |table| %>
 <div class="row">
  <%= table["country"] %>
 </div>
 <div class="row">
  <%= table["home"] vs table["away"] %>
 </div>
<% end %>

结果是：

<div class="row">
england
</div>
<div class="row">
team a vs team b
</div>
<div class="row">
england
</div>
<div class="row">
team c vs team d
</div>

如何删除与前一循环中的值相同的值？

Answer 1

您可以使用Enumerable#group_by：

@country_table = @table.group_by { |i| i['country'] }

然后你可以：

@country_table.each do |country, matches|
  puts country
  puts matches.map { |_, v| v.values_at('home', 'away').join(' vs ') }
end

迭代哈希值，只显示一次重复值

1 个答案: