<%= select_tag :owner_type, options_for_select([["Owner", nil]] + available_owner_types, selected: params[:owner_type]), onchange: "submit();", class: "form-control" %>

<%= select_tag :event, options_for_select([["Event", nil]] + available_events, selected: params[:event]), onchange: "submit();", class: "form-control" %>

<%= select_tag :event_source, options_for_select([["Event Source", nil]] + available_event_sources, selected: params[:event_source]), onchange: "submit();", class: "form-control" %>

<%= select_tag :time_interval, options_for_select([["Time Interval", nil], ["yearly", "year"], ["monthly", "month"], ["weekly", "week"]], selected: params[:time_interval]), onchange: "submit();", class: "form-control" %>