## Formularz
-content_for(:sidebar) do
  %h2.right Szukaj użytkownika
  -form_for @search, :url => admin_users_path do |f|
    -f.fields_for @search.conditions do |users|
      = users.text_field :login_contains
    -f.fields_for @search.conditions.profile do |profile|
      = profile.text_field :name_contains
    = f.submit "Szukaj"
## Kontroler
  def index
    @search = User.new_search(params[:search])
    @users, @users_count = @search.all, @search.count
  end
## Błąd
Unknown key(s): profile
## Parametry
{"search"=>{"conditions"=>{"login_contains"=>""},
 "profile"=>{"name_contains"=>"ernest"},
 "order_as"=>"",
 "priority_order_by"=>"",
 "per_page"=>"25",
 "order_by"=>"",
 "priority_order_as"=>""},
 "commit"=>"Szukaj"}
## Console
>> search = User.new_search
=> #<UserSearch {:limit=>25}>
>> search.conditions.profile.name_contains = "Romek"
=> "Romek"
>> search.all.size
=> 2