如何在rails中对表列进行排序?

eva*_*anx 4 ruby-on-rails-3

我在Ryan Bates教程之后实现了这个sort table columns并且它工作得很好,但是当我渲染索引页时,表已经按标题(asc)排序,并且我想仅在用户单击列标题时对列进行排序.

我怎么能实现这个目标?

调节器

class ProductsController < ApplicationController
  helper_method :sort_column, :sort_direction

  def index
    @products = Product.order(sort_column + " " + sort_direction)
  end

  # ...

  private

  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
end
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是helper_method

def sortable(column, title = nil)
  title ||= column.titleize
  css_class = column == sort_column ? "current #{sort_direction}" : nil
  direction = column == sort_column && sort_direction == "asc" ? "desc" : "asc"
  link_to title, {:sort => column, :direction => direction}, {:class => css_class}
end
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index.html.erb

<tr>
  <th><%= sortable "name" %></th>
  <th><%= sortable "price" %></th>
  <th><%= sortable "released_at", "Released" %></th>
</tr>
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CSS

.pretty th .current {
  padding-right: 12px;
  background-repeat: no-repeat;
  background-position: right center;
}

.pretty th .asc {
  background-image: url(/images/up_arrow.gif);
}

.pretty th .desc {
  background-image: url(/images/down_arrow.gif);
}
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kob*_*ltz 6

你应该看看Ransack.它在排序和复杂搜索方面做得很好.有一个很棒的RailsCasts视频可以帮助你,并且侵入性更小.