credits.rb

csv do
    column 'credit id' do |credit|
      credit.id.to_s
    end
    column "account id" do |credit|
      credit.account_id.to_s
    end
    column('enterprise') { |c| c.account && (c.account.enterprise? ? 'yes' : '') || '' }
    column "client id" do |credit|
      credit.user && credit.user.id.to_s || 'no user'
    end
    column 'client name' do |credit|
      credit.user && credit.user.display_name || 'no user'
    end
    column 'email' do |credit|
      credit.user && credit.user.email || 'no user'
    end
    column "credit type" do |credit|
      credit.source
    end
    column "orig. credits" do |credit|
      credit.original_value.to_s
    end
    column "credits spent" do |credit|
      credit.value_spent
    end
    column 'price per test' do |credit|
      credit.price_per_test
    end
    column "remaining $ value" do |credit|
      (credit.price_per_test * (credit.original_value - credit.value_spent)).to_s
    end
    column :created_at
    column :expiration_date
    column :notes
    column 'order id' do |credit|
      credit.try(:order).try(:id).to_s
    end
    column 'order completed at' do |credit|
      credit.try(:order).try(:completed_at).to_s
    end
  end