tags - 如何在 acts_as_taggable_on 中生成标签云？

Question

我无法调试我收到错误的原因:

class VendorsController < ApplicationController
  def tag_cloud
    @tags = Vendor.tag_counts_on(:tags)
  end

我将此类设置为可标记:

class Vendor < ActiveRecord::Base
  acts_as_taggable_on :tags, :competitors

我包含了 TagsHelper:

module VendorsHelper
  include TagsHelper
end

这是我的看法:

 <% tag_cloud(@tags, %w(css1 css2 css3 css4)) do |tag, css_class| %>

    <%= link_to tag.name, { :action => :tag, :id => tag.name }, :class => css_class %> 

<% end %>

这是我得到的错误:

You have a nil object when you didn't expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.empty?

Vendor 的每个实例都有至少一个 Tag。

Answer 1

知道了，我需要在 index controller 中添加:@tags = Vendor.tag_counts_on(:tags)。