Usecase after adding the new customer booking counter

get_customer.go

package usecases                                                                                                       
                                                                                                                       
import "github.com/example/go-abstractions/entities"                                                                   
                                                                                                                       
type CustomerGetter interface {                                                                                        
  GetCustomer(customerID uint) (entities.Customer, error)                                                              
}                                                                                                                      
                                                                                                                       
type CustomerBookingsCounter interface {                                                                               
  CountCustomerBookings(customerID uint) (uint, error)                                                                 
}                                                                                                                      
                                                                                                                       
func NewGetCustomerUseCase(customerGetter CustomerGetter, customerBookingsCounter CustomerBookingsCounter) func(uint) (entities.Customer, error) {
  return func(customerID uint) (entities.Customer, error) {                                                            
    customer, err := customerGetter.GetCustomer(customerID)                                                            
    if err != nil {                                                                                                    
      return entities.Customer{}, err                                                                                  
    }                                                                                                                  
                                                                                                                       
    numberBookings, err := customerBookingsCounter.CountCustomerBookings(customerID)                                   
    if err != nil {                                                                                                    
      return entities.Customer{}, err                                                                
    }                                                                                                
    customer.NumberBookings = numberBookings                                                         
                                                                                                     
    return customer, nil                                                                             
  }                                                                                                  
}