Rails:在View中检查has_many

Question

如果我有...

class Bunny < ActiveRecord::Base
  has_many :carrots
end

...如果@bunny有任何胡萝卜,我怎么办查看？我想做这样的事情:

<% if @bunny.carrots? %>
  <strong>Yay! Carrots!</strong>
  <% for carrot in @bunny.carrots %>
    You got a <%=h carrot.color %> carrot!<br />
  <% end %>
<% end %>

我知道@bunny.carrots?不行 - 会怎么样？

Answer 1

<% if @bunny.carrots.any? %>
  <strong>Yay! Carrots!</strong>
  <% for carrot in @bunny.carrots %>
    You got a <%=h carrot.color %> carrot!<br />
  <% end %>
<% end %>