Ruby on Rails

hi everybody!
Link to question on http://stackoverflow.com/q/31350221/2895006

As everybody usually says, I'm newbie in Ruby on Rails) and have
following issue:

I have a search form
https://www.dropbox.com/s/hmr85xh3ra28nsf/Screen%20Shot%202015-07-10%20at%2023.19.07.png?dl=0

and I would like to have ability to add new msisdn if it doesnt exist.
So I make fake insert and want to add conditional link to my
active_scaffold grid instead of currently exist ones:

config.action_links.add :submit_create, :label => "Create blacklisted
user", :type => :record, :confirm => "Are you sure?", :inline => true,
:method => :get
Here is my controller

>class CCare::UserstatusController < ApplicationController

>before_filter :filter_search

>  verify :method => :post,
>         :only => :stop,
>         :redirect_to => { :action => :index }
>

    >  active_scaffold :users do |config|
    >    config.label = "User Status"
    >    config.list.columns = [:msisdn, :user_agent, :network ]
    >    config.actions = [:search, :field_search, :list, :nested]
    >    config.actions.swap :search, :field_search
    >    config.field_search.columns = [:msisdn]
    >    config.columns[:id].label = "ID"
    >    config.columns[:id].search_sql = "users.id = ?"
    >    config.columns[:id].search_ui = :text
    >
    >    config.columns[:msisdn].search_sql = "users.msisdn = ?"
    >    config.columns[:msisdn].search_ui = :text
    >
    >    config.columns[:network].sort = {:sql => "network.network" }
    >    config.columns[:network].search_sql = "network.network"
    >    config.columns[:network].search_ui = :select
    >    config.columns[:network].actions_for_association_links =
[:show]
    >    config.columns[:user_agent].label = "Device"
    >    config.nested.add_link("Subscriptions", [:user_service_list])
    >    config.nested.add_link("Contact History", [:user_contact])
    >      config.action_links.add "show_stop_all", :label => "Stop
All", :type > => :record, :crud_type => :create, :inline => true,
:position => :after
    >    config.list.always_show_search = true
    >  end

    >  def update_table
    >    if params[:search].nil? and params[:nested].nil?
    >      render :partial => "shared/empty_list", :layout => false
    >    else
    >      if not params[:search][:id].nil? and not
params[:search][:id].empty? >and not params[:search][:id] =~ /^[0-9]+$/
    >        flash[:error] = "ID is not a number"
    >        render :partial => "shared/empty_list", :layout => false
    >        return
    >      end
    >      if (is_msisdn_exist)
    >        super
    >      else
    >        user = User.new
    >        user.msisdn = params[:search][:msisdn]
    >        user.user_list_id = 1
    >        user.save
    >        super
    >      end
    >    end
    >  end
I tried to put method is_msisdn_exist into

active_scaffold :users do |config|
  ....
end
but it returned error: method not found. How can I implement my
conditional link?

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