gistfile1.rb

# Controller
    @filters = {
      :states        => %w{active inactive all},
      :owners        => current_account.users,
      :organisations => current_account.organisations,
    }

# View
- form_tag projects_path, :method => :get, :id => 'filters' do
  %h2 Customise view
  %p
    %label 
      State:
      = filter_tag :state, @filters[:states], :value => :titleize
      = select_tag :state, options_for_select(@filters[:states].collect{ |s| [s.titleize, s] }, params[:state])
  %p
    %label 
      Owner:
      = filter_tag :owner_id, @filters[:owners], :prompt => 'All'
      = select_tag :owner_id, options_for_select([['All', nil]] + @filters[:owners].collect{ |u| [u, u.id] }, params[:owner_id].to_i)
  %p
    %label 
      Client:
      = filter_tag :organisation_id, @filters[:organisations], :prompt => 'All'
      = select_tag :organisation_id, options_for_select([['All', nil]] + @filters[:organisations].collect{ |o| [o, o.id] }, params[:organisation_id].to_i)
  %p.actions
    = submit_tag 'Filter'