ruby-on-rails - 布料中的 NoMethodError#index

Question

我无法解决这个问题。我不断收到同样的错误:

(undefined method `id' for nil:NilClass):

这是我的 application.html

<% @categories.each do |category| %> 
<li><a><%= link_to 'category.title', category_cloth_path(@category)%></a></li>
<%end%>

cloths_controller.rb

def index
@cloths = Cloth.all
@categories = Category.all 
end

def show
@cloths = Cloth.all
@categories = Category.where("category_id = ?", @category.id)
@comments = Comment.where("cloth_id = ?", @cloth.id)
@comments = Comment.paginate(:page => params[:page], :per_page => 3)
end

Answer 1

尝试更改 @category至 category :

<% @categories.each do |category| %> 
  <li><%= link_to category.title, category_cloth_path(category)%></li>
<%end%>

注意: link_to创建 <a></a> , 所以你不需要附上 <%= link_to %>在 <a></a> 内