Question

我有一个页脚助手来显示链接

  def footer_helper
    resources = ["tweet","questions"] # and perhaps something more
     resources.map do  |resource|
       if current_page?(controller: resource.pluralize, action: 'index')
         link_to "New #{resource.humanize}", {controller: resource.pluralize, action: 'new'}
        else
         link_to "#{resource.pluralize.humanize}",{controller: resource.pluralize, action: 'index'}
       end
    end.join(" ")
  end

并在footer.html.erb中写道：

<%= raw footer_helper %>

问题：

.join(" ")非常丑陋。这有更好的语法吗？如果我不使用它，.map将返回一个包含链接html的数组。

Answer 1

def footer_helper
  ["tweet","questions"].map do  |resource|
    if current_page?(controller: resource.pluralize, action: 'index')
      link_to "New #{resource.humanize", send(:"new_#{resource}_path")
    else
      link_to resource.pluralize.humanize, send(:"index_#{resource}_path")
    end
  end.join(" ").html_safe
end

并在 footer.html.erb 中简单地说：

<%= footer_helper %>

Answer 2

我认为连接很好，但是你实例化了一个你不需要的变量。此外，您可以使用发送路径。代码如下。

def footer_helper
  ["tweet","questions"].map do |resource|
    if current_page?(controller: resource.pluralize, action: 'index')
      link_to "New #{resource.humanize}", send("new_#{resource}_path".to_sym)
    else
      link_to "#{resource.pluralize.humanize}", send("index_#{resource}_path".to_sym)
    end
  end.join(' ')
end

Rails：如何从map方法设置返回值？

2 个答案: