```ruby
class Admin::QuotasController < Admin::SimpleCrudController

  def index
    @years = Quota.years_array
    index!
  end

  def duplication
    @years = Quota.years_array
    @count = Quota.where('EXTRACT(year from start_date) = ?', @years.first).
      count
    @geo_entities = GeoEntity.joins(:quotas).order(:name_en).uniq
  end

  def duplicate
    QuotasCopyWorker.perform_async(params[:quotas])
    redirect_to admin_quotas_path({:year => params[:quotas][:start_date].split("/")[2]}), 
      :notice => "Your quotas are being duplicated in the background.
      They will be available from this page in a few seconds (please refresh it)"
  end

  def count
    @count = Quota.count_matching params
    render :json => @count.to_json
  end

  protected

  def collection
    @quotas ||= end_of_association_chain.order('start_date DESC').
      page(params[:page]).search(params[:query])
    return @quotas if !params[:year]
    @quotas = @quotas.where('EXTRACT(year from start_date) = ?', params[:year])
  end
end
```

Include year that is passed from params. (When quotas are duplicated for a new year, that year will not be in the array of years, until they have been copied. This way the interface shows it nevertheless, otherwise users might think it didn't work)
user
```ruby
class Admin::QuotasController < Admin::SimpleCrudController

  def index
    @years = Quota.years_array
    if params[:year] && !@years.include?(params[:year])
      @years = @years.push(params[:year]).sort{|a,b| b <=> a}
    end
    index!
  end

  def duplication
    @years = Quota.years_array
    @count = Quota.where('EXTRACT(year from start_date) = ?', @years.first).
      count
    @geo_entities = GeoEntity.joins(:quotas).order(:name_en).uniq
  end

  def duplicate
    QuotasCopyWorker.perform_async(params[:quotas])
    redirect_to admin_quotas_path({:year => params[:quotas][:start_date].split("/")[2]}), 
      :notice => "Your quotas are being duplicated in the background.
      They will be available from this page in a few seconds (please refresh it)"
  end

  def count
    @count = Quota.count_matching params
    render :json => @count.to_json
  end

  protected

  def collection
    @quotas ||= end_of_association_chain.order('start_date DESC').
      page(params[:page]).search(params[:query])
    return @quotas if !params[:year]
    @quotas = @quotas.where('EXTRACT(year from start_date) = ?', params[:year])
  end
end
```
assistant