DataTables in Rails

gistfile1.txt

In the CoffeeScript:
  # Row clicking
      selected_id = ''
      $('#table_name tbody').on "click", "tr", ->
        if $(event.target.parentNode).hasClass("info")
          $(event.target.parentNode).removeClass "info"
          selected_frame_order = ''
        else
          table_name.$("tr.info").removeClass "info"
          $(event.target.parentNode).addClass "info"
          row = table_name.row(this).data()
          $('#btn_show').removeClass('disabled')
          $('#btn_edit').removeClass('disabled')
          $('#btn_destroy').removeClass('disabled')
          selected_id = row[0]

      table_name = $("#shipment_table").DataTable
          bRetrieve: true
          processing: true
          serverSide: true
          filter: false
          ajax:
            url: $('#table_name').data('source')
            data: (d) ->
              return
          order: [[ 0, "desc" ]]
          
In the controller:
  def index
    respond_to do |format|
      format.html { @current_screen = title }
      format.json { render json: DatatableName.new(view_context) }
    end
  end
  
In the DataTable File:
  class DatatableName
    delegate :params, :h, :link_to, :number_to_currency, to: :@view
  
    def initialize(view)
      @view = view
    end
  
    def as_json(options = {})
      {
        draw: params[:sEcho].to_i,
        recordsTotal: ObjectName.count,
        recordsFiltered: objects.total_entries,
        data: data
      }
    end
  
    private
  
    def data
      objects.map do |o|
        [
          o.id,
          o.name,
          o.description
        ]
      end
    end
  
    def objects
      @objects ||= fetch_objects
    end
  
    def fetch_objects
      ObjectName.all.page(page).per_page(per_page)
    end
  
    def page
      params[:start].to_i / per_page + 1
    end
  
    def per_page
      params[:length].to_i > 0 ? params[:length].to_i : 50
    end
  
    def sort_column
      columns = %w(id name description)
      columns[ params[:order]['0']['column'].to_i]
    end
  
    def sort_direction
      params[:order]['0']['dir'] == 'desc' ? 'desc' : 'asc'
    end
  end
  
In the veiw:
  <table id="table_name" class="hover row-border compact" width="100%" data-source="<%= objects_url(format: "json") %>">
    <thead>
      <tr>
        <th>id</th>
        <th>Name</th>
        <th>Description</th>
      </tr>
    </thead>
  
    <tbody>
    </tbody>
  </table>
  
In the JSON file:
  json.array!(@objects) do |object|
    json.id object.id
    json.name object.name
    json.description object.description
  end