sorting embedded struct via generics

account.go

package model

type Account struct {
	Entity
	Username        string `json:"username" dynamodbav:"username"`
	Name            string `json:"name,omitempty" dynamodbav:"name"`
	Broker          string `json:"broker,omitempty" dynamodbav:"broker"`
	AuthKey         string `json:"authkey,omitempty" dynamodbav:"authkey"`
	BrokerAccountID string `json:"brokeraccountid,omitempty" dynamodbav:"brokeraccountid"`
	LastSyncMillis  int64  `json:"lastsync,omitempty" dynamodbav:"lastsync"`
}

// this works:
func foo() {
  accts = make([]*model.Account, 5)
  // code to populate accts redacted
  SortByID(accts)
}

entity.go

package model

import (
	"sort"
	"strings"
)

type Entity struct {
	Partition string `json:"partition" dynamodbav:"part"`
	ID        string `json:"id" dynamodbav:"id"`
	CreatedAt int64  `json:"createdAt" dynamodbav:"createdAt"`
	UpdatedAt int64  `json:"updatedAt"  dynamodbav:"updatedAt"`
}

func (e Entity) GetID() string       { return e.ID }
func (e Entity) GetCreatedAt() int64 { return e.CreatedAt }
func (e Entity) GetUpdatedAt() int64 { return e.UpdatedAt }

type IEntity interface {
	GetID() string
	GetCreatedAt() int64
	GetUpdatedAt() int64
}

func SortByID[T IEntity](s []T) {
	sort.Slice(s, func(i, j int) bool {
		return strings.Compare(s[i].GetID(), s[j].GetID()) < 0
	})
}

func SortByCreatedAt[T IEntity](s []T) {
	sort.Slice(s, func(i, j int) bool {
		return s[i].GetCreatedAt() < s[j].GetCreatedAt()
	})
}

func SortByUpdatedAt[T IEntity](s []T) {
	sort.Slice(s, func(i, j int) bool {
		return s[i].GetUpdatedAt() < s[j].GetUpdatedAt()
	})
}