无法将符号转换为整数

时间:2011-02-25 15:38:29

标签: ruby-on-rails


我创建了一个简单的表格分类器:

ProductsController:   
 helper_method :sort_column, :sort_direction
  # GET /products
  # GET /products.xml
  def index
    @products = Product.order(sort_column+ " "+sort_direction)

    respond_to do |format|
      format.html # index.html.erb
      format.xml  { render :xml => @products }
    end
  end

Application_helper

module ApplicationHelper

  def sortable(column, title = nil )
    title ||= column.titleize
    direction = column == sort_column && sort_direction[:direction] == "asc" ? "desc" : "asc"
    link_to title, {:sort => column, :direction => direction}
  end
end

并查看:

 <tr>
    <th><%= sortable "name"%></th>
    <th><%= sortable "price"%></th>
    <th><%= sortable "released" %></th>
  </tr>

在我尝试打开/产品页面后,我收到了此错误(Rails v 3.0.3):

   can't convert Symbol into Integer
Extracted source (around line #5):

2: 
3: <table>
4:   <tr>
5:     <th><%= sortable "name"%></th>
6:     <th><%= sortable "price"%></th>
7:     <th><%= sortable "released" %></th>
8:   </tr>

排序方法:

 def sort_column
    Product.column_names.include?(params[:sort]) ? params[:sort] : "name"
  end

  def sort_direction
    %w[asc desc].include?(params[:direction]) ? params[:direction] : "asc"
  end

1 个答案:

答案 0 :(得分:4)

direction = column == sort_column && sort_direction[:direction] == "asc" ? "desc" : "asc"

应该改为这个。 sort_direction看起来像是一个字符串,但你把它当成哈希。

direction = column == sort_column && sort_direction == "asc" ? "desc" : "asc"