如何获得标签可链接？

时间：2015-02-06 19:13:21

标签： sql ruby-on-rails syntax-error acts-as-taggable-on railscasts

我正在使用这个railscast一集：http://railscasts.com/episodes/382-tagging，它建议这个宝石：https://github.com/mbleigh/acts-as-taggable-on， 在我点击一个用户创建的标签链接之前一切都很好，这就是假设然后列出所点击的标签的每个实例，但我得到了这个错误信息：

SQLite3::SQLException: near "values": syntax error: SELECT "values".* FROM "values" JOIN taggings values_taggings_5183317 ON values_taggings_5183317.taggable_id = values.id AND values_taggings_5183317.taggable_type = 'Value' AND values_taggings_5183317.tag_id = 2

你能帮帮我吗？

# _form

  <div class="form-group">
    <%= f.text_field :tag_list, class: 'form-control', placeholder: 'Enter Tag(s)' %>
  </div>
    
# Controller
    
  def index
    if params[:tag]
      @values = Value.tagged_with(params[:tag])
    else
      @values = Value.order('RANDOM()')
    end
  end

    def value_params
      params.require(:value).permit(:name, :tag_list)
    end
end
    
# index

  <td class="category">
   <b><%= raw value.tag_list.map { |t| link_to t, tag_path(t) }.join(', ') %>    </b></td>
    
# routes
    
  get 'tags/:tag', to: 'values#index', as: :tag
    

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提前致谢!!!

1 个答案:

答案 0 :(得分：0)

我认为问题是双重的。

  1. 标记“values”是标准SQL中的保留字。作为insert into table_name values (...);。
  2. 您可以在没有双引号的情况下使用它，对于用作标识符的保留字，标准SQL 中需要。 （最好不要那样使用保留字，但仍然......）MySQL不是标准的;它使用反引号。 SQL Server使用方括号。

    3. 您需要引用values.id。

    SELECT "values".* 
FROM "values" 
JOIN taggings values_taggings_5183317 
    ON values_taggings_5183317.taggable_id = "values".id 
                                          -- ^      ^
AND values_taggings_5183317.taggable_type = 'Value' 
AND values_taggings_5183317.tag_id = 2
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