Question

Would like to know is that possible to have filter with default value with active admin? This will be helpful for preloading the data for the admin user.

filter  :country, :default=>'US'

Answer 1

You can do it by defining before_filter

  before_filter :only => [:index] do
    if params['commit'].blank?
       #country_contains or country_eq .. or depending of your filter type
       params['q'] = {:country_eq => 'US'} 
    end
  end

UPD:

in some cases you need to set filter if params[:q] is empty or params[:scope] empty

so this might work better

  before_filter :only => [:index] do
    if params['commit'].blank? && params['q'].blank? && params[:scope].blank?
       #country_contains or country_eq .. or depending of your filter type
       params['q'] = {:country_eq => 'US'} 
    end
  end