服务器端 jQuery DataTable 错误的搜索功能

Question

我已经将我的 jQuery DataTable 从客户端转换到服务器端，以更快地加载 1000 多个数据。

但是我在如何实现服务器端搜索时遇到了困难，因为不是一次加载所有数据。

我在关注 railscast (http://railscasts.com/episodes/340-datatables)

app/datatables/wine_list_datatable.rb

class WineListsDatatable
  delegate :params, :link_to, :number_to_currency, :content_tag, to: :@view

  def initialize(view)
    @view = view
  end

  def as_json(options = {})
    {
      sEcho: params[:sEcho].to_i,
      iTotalRecords: WineList.count,
      iTotalDisplayRecords: wine_lists.total_entries,
      aaData: data
    }
  end

private

  def data
    wine_lists.map do |wine_list|
      [
        (wine_list.vintage),
        (wine_list.name),
        (wine_list.region),
        (wine_list.country.name),
        (wine_list.wine_maker.name),
        link_to('profile', wine_list.wine_maker),
        (wine_list.score),
        link_to('delete', wine_list, :method => "Delete", data: {confirm: "Are you sure?"}),
        link_to('edit', [:edit, wine_list])
      ]
    end
  end

  def wine_lists
    @wine_lists ||= fetch_wine_lists
  end

  def fetch_wine_lists
    wine_lists = WineList.order("#{sort_column} #{sort_direction}")
    wine_lists = wine_lists.page(page).per_page(per_page)
    if params[:sSearch].present?
      wine_lists = wine_lists.where("name like '%?%'", search: params[:sSearch])
    end
    wine_lists
  end

  def page
    params[:iDisplayStart].to_i/per_page + 1
  end

  def per_page
    params[:iDisplayLength].to_i > 0 ? params[:iDisplayLength].to_i : 10
  end

  def sort_column
    columns = %w[name category released_on price]
    columns[params[:iSortCol_0].to_i]
  end

  def sort_direction
    params[:sSortDir_0] == "desc" ? "desc" : "asc"
  end
end

我感到困惑的那一行是在

      wine_lists = wine_lists.where("name like '%?%'", search:  params[:sSearch])

目前，我收到 2 个错误。

DataTables 警告：表 id=wine_lists - Ajax 错误。有关此错误的更多信息，请参阅http://datatables.net/tn/7

谢谢！

Answer 1

该行的语法错误。 Railscast 中的搜索查询是这样的：

products = products.where("name like :search or category like :search", search: "%#{params[:sSearch]}%")

但你的线是

wine_lists = wine_lists.where("name like '%?%'", search: params[:sSearch])

解决方案是更改'%?%'：

wine_lists = wine_lists.where("name like '%#?%'", params[:sSearch])

或关注 Railscast：

wine_lists = wine_lists.where("name like :search", search: "%#{params[:sSearch]}%")

请注意，jQuery Datatable 已更新到 1.10，其中对参数命名进行了重大更改。它仍然兼容 Railscast 中使用的 1.9 命名，但如果您想升级到 1.10，here 是参数新命名的参考。