IF statment in rails

I'm trying to make a select to filter a table, with had 2 entries, annual and monthly, i need the table to change as the user select on the options. I trying do that using the if along with the view, but not seens to work. Heres how my code are until now.

On home_controller:

def top_regions
    state_name = t :states, scope: 'date'

    query = @current_account.coaches.top_regions_year
      .select('addresses.state_name, sum(coalesce(coaches.credits_purchased,0)) as credits')
      .left_outer_joins(person: :address)
      .group('addresses.state_name')
      .order('credits DESC')
      .limit(10)

      @topregions1 = (query)

    query = @current_account.coaches.top_regions_month
      .select('addresses.state_name, sum(coalesce(coaches.credits_purchased,0)) as credits')
      .left_outer_joins(person: :address)
      .group('addresses.state_name')
      .order('credits DESC')
      .limit(10)

      @topregions2 = (query)
  end

On view:

%legend.c-indicators__legend.d-flex.justify-content-between
  Regiões mais Ativas
  %select.form-control.d-flex.align-items-end.col-4
    %option{:value => "1"} Anual
    %option{:value => "2"} Mensal
.c-indicators__card
  %table.table.c-table.table-striped.m-3
    %thead
      %tr
        %th Pos.
        %th Estado
        %th{:align => "right"} Total de Testes
    %tbody
      - @topregions.each_with_index do |item, index|
        %tr
          %td= (index + 1)
          %td= item[:state_name]
          %td{:align => "right"}= item[:credits]

The two @topregions options that i had in the controller works, if a put the @topregions1 or topregions2 on the view, but i need the dynamic change when selected