Form with saved vairables

event_sessions_controller.rb

def index
    if params[:commit] == 'Filter'
      @title = params[:title]
      title = @title.present? ? @title : nil

      @type = params[:type]
      type = @type.present? ? @type.gsub(/\s+/, '') : nil

      @speaker = params[:speaker]
      speaker = @speaker.present? ? @speaker : nil

      @event_resource = params[:event_resource]
      event_resource = @event_resource.present? ? @event_resource.to_i : nil

      @date = params[:date]
      date = @date.present? ? @date : nil

      @start_time = params[:start_time]
      start_time = @start_time.present? ? @start_time : nil

      @duration = params[:duration]
      duration = @duration.present? ? @duration : nil

      @event_sessions = EventSession.for_event(current_event)
                                    .title_has(title)
                                    .speaker_has(speaker)
                                    .of_type(type)
                                    .on_day(date)
                                    .lasting(duration)
                                    .taking_place_at(event_resource)
                                    # .speaker_has(speaker)
                                    # .with_speaker(speaker)
                                    #.with_status(params[:session_filter][:status])
    else
      @event_sessions = EventSession.for_event(current_event)
    end

    @types = EventSession::SESSION_TYPES.map { |type| type.titleize }
    # @speakers = Attendance.for_event(current_event).speakers.map { |speaker| speaker.full_name }
    @event_resources = current_event.event_resources
    @dates = current_event.date_array
    @start_times = EventSession.for_event(current_event).pluck(:starts_at).uniq.map { |t| t.strftime('%l:%M %p') }
    @durations = EventSession.for_event(current_event).order(:duration).pluck(:duration).uniq

    @event_sessions_count = @event_sessions
    @event_sessions = @event_sessions.page(params[:page])
  end

form.html.erb

<%= form_tag('', method: 'get') do %>
    <h2>Filters</h2>

    <div class="row-fluid">
      <div class="span4">
        <label>The <strong>Session Title</strong> contains:</label>
        <%= text_field_tag(:title, @title) %>
      </div>
      <div class="span4">
      </div>
    </div>
    <div class="row-fluid">
      <div class="span4">
        <div class="select-margin">
          <label>The <strong>Session Type</strong> is:</label>
          <%= select_tag(:type, options_for_select(@types, @type), include_blank: true) %>
        </div><!-- .select-margin -->
        <div class="select-margin">
          <label>The <strong>Date</strong> is:</label>
          <%= select_tag(:date, options_for_select(@dates, @date), include_blank: true) %>
        </div><!-- .select-margin -->
      </div><!-- .span4 -->
      <div class="span4">
        <label>The <strong>Speaker Name</strong> contains:</label>
        <%#= select_tag(:speaker, options_for_select(@speakers, @speaker), include_blank: true) %>
        <%= text_field_tag(:speaker, @speaker) %>
        <div class="select-margin">
          <label>The <strong>Start Time</strong> is:</label>
          <%= select_tag(:start_time, options_for_select(@start_times, @start_time), include_blank: true) %>
        </div><!-- .select-margin -->
      </div><!-- .span4 -->
      <div class="span4">
        <div class="select-margin">
          <label>The <strong>Location</strong> is:</label>
          <%= select_tag(:event_resource, options_from_collection_for_select(@event_resources, :id, :name, @event_resource), include_blank: true) %>
        </div><!-- .select-margin -->
        <div class="select-margin">
          <label>The <strong>Duration</strong> is:</label>
          <%= select_tag(:duration, options_for_select(@durations, @duration), include_blank: true) %>
        </div><!-- .select-margin -->
      </div><!-- .span4 -->
    </div><!-- .row-fluid -->

    <%= submit_tag 'Filter', class: 'btn btn-primary' %>
    <%= link_to "Reset Filters", manage_event_sessions_path, class: 'btn' %>

  <% end %>