common

type BulkLoader interface {
	LoadMonthInvoices() (invoices []model.Invoice, err error)
	LoadProducts() (products map[string]model.Product, err error)
	LoadCustomers() (customers map[int]model.Customer, err error)
	LoadCustomersAndProducts() (customers map[int]model.Customer, products map[string]model.Product, err error)
	LoadMonthInvoicesCustomersAndProducts() (invoices []model.Invoice, customers map[int]model.Customer, products map[string]model.Product, err error)
}