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def index
    @customer = Customer.find(params[:customer_id])

    @unused_count = @customer.purchases.outstanding.count
    @expired_count = @customer.purchases.expired.count
    @used_count = @customer.purchases.redeemed.count
    @total_count = @customer.deals.count

    # initialize with 'all'
    purchases = @customer.purchases

    # then drill down further into scopes if necessary
    if params[:filter] == "active"
      purchases = purchases.outstanding
    elsif params[:filter] == "used"
      purchases = purchases.redeemed
    elsif params[:filter] == "expired"
      purchases = purchases.expired
    else
      # default is to show active deals
      purchases = purchases.outstanding
    end

    if params[:sort] == 'expiration'
        purchases = purchases.order(:expiration_date)
    elsif params[:sort] == 'purchase'
        purchases = purchases.order(:purchased_on)
    end

    @purchases = purchases.search(params[:q]).page(params[:page])
  end