ERB 模板嵌套变量 - 访问基于数组元素的散列键

Question

我有以下数据和 erb 模板：到端口号的散列映射服务和一组服务。

我为每个服务遍历数组，我需要访问散列以获取当前正在处理的服务的端口号。我似乎不允许按照下面的方式嵌套变量。有没有更好的方法？

ports = {"max-api" => 83, "max-logger" => 82, "max-data" => 84}

services = %w( max_api max_data max_logger )

  <% @services.each do |service| %>
      <% if service.include?("max_logger") %>
        shell: echo <%= service %>:<%= @ports["<%= service %>"] %>
      <% else %>
        shell: echo <%= service %>:<%= @ports["<%= service %>"] %>00  
      <% end %>
  <% end %>

最简单的示例我有 erb 模板

<% @services.each do |service| %>
<%= @ports[<%= service %>] %>
<% end %>

如果我尝试运行我的代码，我会收到以下错误：

Chef::Mixin::Template::TemplateError
------------------------------------
(erubis):2: syntax error, unexpected '<', expecting ']'
 _buf << ( @ports[<%= service ).to_s; _buf << ']...
                   ^
(erubis):2: unterminated string meets end of file

Answer 1

我最近意识到，如果名称（数组值、哈希键）不匹配，它们将无法工作：

{"max-api" => 83, "max-logger" => 82, "max-data" => 84}

它们的区别在于 - and/or _ 与 @services:

%w( max_api max_data max_logger )

稍微调整了一下 @services:

ports = {'max-api' => 83, 'max-logger' => 82, 'max-data' => 84}
services = %w(max-api max-data max-logger)

services.each do |service|
  puts "shell: echo #{service}:#{ports[service]}#{'00' if service != 'max-logger'}"
end
# => shell: echo max-api:8300
# => shell: echo max-data:8400
# => shell: echo max-logger:82

ERB 模板嵌套变量 - 访问基于数组元素的散列键

ERB template nested variable - accessing a hash key based on array element

ruby

ruby-on-rails

erb