datatable.to_json

gistfile1.rb

    #------------------------------------------------------------------------------------------------------------------
    #  type       name                  description
    #------------------------------------------------------------------------------------------------------------------
    #  int        iTotalRecords         Total records, before filtering (i.e. the total number of records in
    #                                   the database)
    #
    #  int        iTotalDisplayRecords  Total records, after filtering (i.e. the total number of records after
    #                                   filtering has been applied - not just the number of records being returned
    #                                   in this result set)
    #
    #  string     sEcho                 An unaltered copy of sEcho sent from the client side. This parameter will
    #                                   change with each draw (it is basically a draw count) - so it is important
    #                                   that this is implemented. Note that it strongly recommended for security
    #                                   reasons that you 'cast' this parameter to an integer in order to prevent
    #                                   Cross Site Scripting (XSS) attacks.
    #
    #  string     sColumns              Optional - this is a string of column names, comma separated (used in
    #                                   combination with sName) which will allow DataTables to reorder data on the
    #                                   client-side if required for display
    #
    #  array      aaData                The data in a 2D array
    #-----------------------------------------------------------------------------------------------------------------
    def to_json(params)
      ActiveSupport::JSON.encode({
       :iTotalRecords => total_records(params),
       :iTotalDisplayRecords => total_display_records(params),
       :sEcho => (params.has_key?(:sEcho) ? params[:sEcho].to_i : -1),
       :aaData => data(params)
      })
    end