[英]Conditional tag wrapping in Rails / ERB
What would be the most readable and/or concise way to write this in ERB?在 ERB 中写这个最易读和/或最简洁的方式是什么? Writing my own method isn't preferable, as I would like to spread a cleaner solution for this to others in my company.编写我自己的方法并不可取,因为我想将一个更清洁的解决方案传播给我公司的其他人。
<% @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.我使用了标签不可知论的 Gal 答案的更通用版本。
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 %>
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它:
<% @items.each do |item| %>
<% conditional_div(:show_div => item.isolated?, :class => 'isolated') do %>
<%= item.name.pluralize %>
<% end %>
<% end %>
Try:尝试:
<% @items.each do |item| %>
<div class="<%= item.isolated? 'isolated' : '' %>">
<%= item.name.pluralize %>
</div>
<% end %>
I will suggest using a helper that will take care of your logic.我会建议使用一个助手来处理你的逻辑。
Avoid conditionals, if, etc in views as long as possible.尽可能避免在视图中使用条件、if 等。
I like PreciousBodilyFluids' answer, but it doesn't strictly do exactly what your existing method does.我喜欢 PreciousBodilyFluids 的回答,但它并没有严格按照您现有的方法做。 If you really cannot have a wrapping div, this may be prefereable:如果你真的不能有一个包装 div,这可能是更可取的:
<% @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:然后您的视图代码将如下所示:
<% @items.each do |item| %>
<%= pluralized_name_for(item) %>
<% end %>
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