def edit
    @config_var = ConfigVar.where(name: params[:name]).first
    unless @config_var
      @config_var = ConfigVar.new name: params[:name]
      if descriptor = ConfigvarsRails.variable_descriptor(params[:name])
        @config_var.value = descriptor.default_value
      end
    end
  end
def edit
    @config_var = ConfigVar.where(name: params[:name]).first
    unless @config_var
      @config_var = ConfigVar.new name: params[:name]
      if descriptor = ConfigvarsRails.variable_descriptor(params[:name])
        @config_var.value = descriptor.default_value
      end
    end
  end
GET /config_vars/http_user/edit