Nil類的未定義方法'+'

Question

我有這個代碼：

<% @accessories.each do |accessory|%>
    <div>
        <%= image_tag(accessory.firebrick_qcg.url , :"title" => accessory.part_number , :"alt" => accessory.description , :"data-size" => accessory.width.to_s + "," + accessory.height , :"data-size2" => accessory.width2.to_s + "," + accessory.height2 , :"data-img1" => accessory.firebrick_qcg.url , :"data-img2" => accessory.firebrick_qcr.url, :"data-img3" => accessory.firebrick_rg.url , class: "img-responsive") %>
    </div>
<% end %>

我收到這個錯誤：

ActionView::Template::Error (undefined method `+' for nil:NilClass):

我看不出有什么問題。 如果有人可以幫助我。

Answer 1

我認為連接錯誤，使用"#{}"在ruby中連接字符串。

保存前修復空格和額外的行。

<% @accessories.each do |accessory|%>
    <div>
        <%= image_tag(accessory.firebrick_qcg.url, 
        :"title" => accessory.part_number, 
        :"alt" => accessory.description, 
        :"data-size" => "#{accessory.width.to_s}, accessory.height",
        :"data-size2" => "#{accessory.width2.to_s}, #{accessory.height2}", 
        :"data-img1" => accessory.firebrick_qcg.url, 
        :"data-img2" => accessory.firebrick_qcr.url, 
        :"data-img3" => accessory.firebrick_rg.url , 
        class: "img-responsive") %>
    </div>
<% end %>