Como yo veo la solucion

invoices_controller.rb

def index
  invoices_by_type
end
def sales
  invoices_by_type
end
def expenses
  invoices_by_type
end
def payroll
  invoices_by_type
end
def invoices_by_type
  type = request.action
  case type
    when "sales"
      invoices = current_company.ingresos
    when "expenses"
      invoices = current_company.egresos
    when "payroll"
      invoices = current_company.payroll
    else
      invoices = current_company.all_invoices
  end
  response = {
          invoices: invoices,
          pagination: meta_pagination(invoices)[:pagination]
  }
  render json: response
end