def map_center
    case request.method_symbol
    when :post
        @@center = params[:data_value]
    when :get
        @cen = []
        @cen << @@center.split(',')[0].split(':')[1].to_f << @@center.split(',')[1].split(':')[1].gsub('}','').to_f
        @town = Address.near([@cen[0],@cen[1]], 4, units: :km).order(:distance)
        @town = ActiveSupport::JSON.encode(@town)
        respond_to do |format|
            format.json { render json: @town }
        end

    end

  end