Rails datatables服務器端處理無法排序/查找

Question

如果我更改從客戶端到服務器端的處理，我將獲得表的所有信息，但我無法搜索和排序列。但它可能會轉到下一頁。我只有2列進行搜索和排序來測試它。希望你能幫助我。

數據庫：

t.text  "comment" 
t.datetime "created_at",   :null => false 
t.datetime "updated_at",   :null => false 
t.integer "source_stock_id" 
t.integer "destination_stock_id" 
t.integer "order_id" 

js.coffee碼：

jQuery -> 
    $("#product_relocates_table").dataTable 
    bProcessing: true 
    bServerSide: true 
    sAjaxSource: $('#product_relocates_table').data('source') 
    "aaSorting": [[ 0, "desc" ]] 

數據表碼：

class ProductRelocatesDatatable 

    delegate :params, :h, :link_to, to: :@view 

    def initialize(view) 
    @view = view 
    end 

    def as_json(options = {}) 
    { 
     sEcho: params[:sEcho].to_i, 
     iTotalRecords: ProductRelocate.count, 
     iTotalDisplayRecords: product_relocates.total_count, 
     aaData: data 
    } 
    end 

    private 

    def data 
    product_relocates.map do |product_relocate| 
     [ 
      h(product_relocate.created_at), 
      h(product_relocate.comment), 
      h(product_relocate.source_stock), 
      h(product_relocate.destination_stock), 
      h(product_relocate.quantity), 
      link_to('Show', [:admin, product_relocate]) 
     ] 
    end 
    end 

    def product_relocates 
    @product_relocates ||= fetch_product_relocates 
    end 

    def fetch_product_relocates 
    product_relocates = ProductRelocate.order("#{sort_column} #{sort_direction}") 
    product_relocates = product_relocates.page(page).per(per) 

    if params[:sSearch].present? 
     search_string = search_columns.map do |search_column| 
     "#{search_column} like :search" 
     end.join(" OR ") 

     product_relocates = product_relocates.where(search_string, search: "%#{params[:sSearch]}%") 
    end 

    product_relocates 
    end 

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

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

    def search_columns 
    %w[product_relocates.created_at product_relocates.comment] 
    end 

    def sort_columns 
    %w[product_relocates.created_at product_relocates.comment] 
    end 

    def sort_column 
    sort_columns[params[:iSortCol_0].to_i] 
    end 

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

Answer 1

我重構來處理服務器端多列搜索超和分類：

https://gist.github.com/2936095

其源自：

http://railscasts.com/episodes/340-datatables

class Datatable 
    delegate :params, :h, :raw, :link_to, :number_to_currency, to: :@view 

    def initialize(klass,view) 
    @klass = klass 
    @view = view 
    end 

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

private 

    def data 
    [] 
    end 

    def items 
    @items ||= fetch_items 
    end 

    def fetch_items 
    items = filtered_list 
    items = selected_columns(items) 
    items = items.order(sort_order) 
    items = items.page(page).per_page(per_page) 
    if params[:sSearch].present? 
     items = items.where(quick_search) 
    end 
    items 
    end 

    def filtered_list 
    @klass.all 
    end 

    def selected_columns items 
    items 
    end 

    def quick_search 
    search_for = params[:sSearch].split(' ') 
    terms = {} 
    which_one = -1 
    criteria = search_for.inject([]) do |criteria,atom| 
     which_one += 1 
     terms["search#{which_one}".to_sym] = "%#{atom}%" 
     criteria << "(#{search_cols.map{|col| "#{col} like :search#{which_one}"}.join(' or ')})" 
    end.join(' and ') 
    [criteria, terms] 
    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 columns 
    [] 
    end 

    def sort_order 
    colnum = 0 
    sort_by = [] 
    while true 
     break if !sorted?(colnum) 
     sort_by << "#{sort_column(colnum)} #{sort_direction(colnum)}" 
     colnum += 1 
    end 
    sort_by.join(", ") 
    end 

    def sorted? index=0 
    !params["iSortCol_#{index}"].nil? 
    end 

    def sort_column index=0 
    index = "iSortCol_#{index}" 
    columns[params[index].to_i] 
    end 

    def sort_direction index=0 
    index = "sSortDir_#{index}" 
    params[index] == "desc" ? "desc" : "asc" 
    end 
end