Ruby-on-rails Rails / ERB 中的条件标签包装
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Conditional tag wrapping in Rails / ERB
提问by Joseph Ravenwolfe
What would be the most readable and/or concise way to write this in ERB? Writing my own method isn't preferable, as I would like to spread a cleaner solution for this to others in my company.
在 ERB 中编写它的最易读和/或最简洁的方法是什么？编写我自己的方法并不可取，因为我想为此向我公司的其他人传播一个更清洁的解决方案。
<% @items.each do |item| %>
<% if item.isolated? %>
<div class="isolated">
<% end %>
<%= item.name.pluralize %> <%# you can't win with indentation %>
<% if item.isolated? %>
</div>
<% end %>
<% end %>
== Update ==
== 更新 ==
I used a more generic version of Gal's answer that is tag agnostic.
我使用了与标签无关的更通用版本的 Gal 答案。
def conditional_wrapper(condition=true, options={}, &block)
options[:tag] ||= :div
if condition == true
concat content_tag(options[:tag], capture(&block), options.delete_if{|k,v| k == :tag})
else
concat capture(&block)
end
end
== Usage
== 用法
<% @items.each do |item| %>
<% conditional_wrapper(item.isolated?, :class => "isolated") do %>
<%= item.name.pluralize %>
<% end %>
<% end %>
采纳答案by Gal
If you really want the DIV to be conditional, you could do something like this:
如果你真的希望 DIV 是有条件的，你可以这样做：
put this in application_helper.rb
把它放在 application_helper.rb
def conditional_div(options={}, &block)
if options.delete(:show_div)
concat content_tag(:div, capture(&block), options)
else
concat capture(&block)
end
end
which then you can use like this in your view:
然后你可以在你的视图中使用这样的：
<% @items.each do |item| %>
<% conditional_div(:show_div => item.isolated?, :class => 'isolated') do %>
<%= item.name.pluralize %>
<% end %>
<% end %>
回答by PreciousBodilyFluids
Try:
尝试：
<% @items.each do |item| %>
<div class="<%= item.isolated? 'isolated' : '' %>">
<%= item.name.pluralize %>
</div>
<% end %>
回答by Unixmonkey
I like PreciousBodilyFluids' answer, but it doesn't strictly do exactly what your existing method does. If you really cannot have a wrapping div, this may be prefereable:
我喜欢 PreciousBodilyFluids 的回答，但它并没有严格按照您现有的方法所做的。如果你真的不能有一个包装 div，这可能是可取的：
<% @items.each do |item| %>
<% if item.isolated? %>
<div class="isolated">
<%= item.name.pluralize %>
</div>
<% else %>
<%= item.name.pluralize %>
<% end %>
<% end %>
A helper method to do all of this would probably look like this:
完成所有这些操作的辅助方法可能如下所示：
def pluralized_name_for(item)
if item.isolated?
content_tag(:div, item.name.pluralize, :class => 'isolated')
else
item.name.pluralize
end
end
Then your view code would look like this:
那么您的视图代码将如下所示：
<% @items.each do |item| %>
<%= pluralized_name_for(item) %>
<% end %>
