fix: use simple slices instead of []*T

README.md

@@ -564,3 +564,16 @@ querier.
 Since this repo layer is just a wrapping layer between the `sqlc.models` and
 my own models, I can extract the conversion part to functions and test them.
 I'm not testing the whole thing but I test what I can.
+
+### 2024/10/24
+
+When writing the tests. I am asking myself the differences between `[]T`,
+`[]*T` and `*[]T`.
+
+`*[]T` is simple, it is a reference to the original slice. So modifying it
+means modifying the original slice.
+
+But between `[]*T` and `[]T`, the only difference that I see (pointed out by
+`ChatGPT`) is how the memory is allocated. With `[]T` it might be better for
+the GC to deal with the memory free. I thing for my project I will stick to
+`[]T`.

internal/howmuch/adapter/repo/event.go

@@ -62,7 +62,7 @@ func convToEventRetrieved(eventDTO *sqlc.GetEventByIDRow) (*model.EventRetrieved
 		return nil, err
 	}
 
-	var users []*model.UserBaseRetrieved
+	var users []model.UserBaseRetrieved
 	err = json.Unmarshal(eventDTO.Users, &users)
 	if err != nil {
 		// Unexpected
@@ -99,8 +99,8 @@ func (e *eventRepository) GetByID(ctx context.Context, eventID int) (*model.Even
 	return convToEventRetrieved(&eventDTO)
 }
 
-func convToEventList(eventsDTO []sqlc.ListEventsByUserIDRow) ([]*model.EventListRetrieved, error) {
-	var events []*model.EventListRetrieved
+func convToEventList(eventsDTO []sqlc.ListEventsByUserIDRow) ([]model.EventListRetrieved, error) {
+	var events []model.EventListRetrieved
 
 	for _, evDTO := range eventsDTO {
 		var owner model.UserBaseRetrieved
@@ -110,7 +110,7 @@ func convToEventList(eventsDTO []sqlc.ListEventsByUserIDRow) ([]*model.EventList
 			log.ErrorLog("json unmarshal error", "err", err)
 			return nil, err
 		}
-		ev := &model.EventListRetrieved{
+		ev := model.EventListRetrieved{
 			ID:          int(evDTO.ID),
 			Name:        evDTO.Name,
 			Description: evDTO.Description.String,
@@ -128,7 +128,7 @@ func convToEventList(eventsDTO []sqlc.ListEventsByUserIDRow) ([]*model.EventList
 func (e *eventRepository) ListEventsByUserID(
 	ctx context.Context,
 	userID int,
-) ([]*model.EventListRetrieved, error) {
+) ([]model.EventListRetrieved, error) {
 	eventsDTO, err := e.queries.ListEventsByUserID(ctx, int32(userID))
 	if err != nil {
 		log.ErrorLog("query error", "err", err)

internal/howmuch/adapter/repo/event_test.go

@@ -59,7 +59,7 @@ func TestConvToEventRetrieved(t *testing.T) {
 			FirstName: "owner",
 			LastName:  "owner",
 		},
-		Users: []*model.UserBaseRetrieved{
+		Users: []model.UserBaseRetrieved{
 			{
 				ID:        1,
 				FirstName: "owner",
@@ -91,7 +91,7 @@ func TestConvToEventList(t *testing.T) {
 		},
 	}
 
-	want := []*model.EventListRetrieved{
+	want := []model.EventListRetrieved{
 		{
 			ID:          123,
 			Name:        "event",

internal/howmuch/model/event.go

@@ -57,7 +57,7 @@ type EventInfoResponse struct {
 	CreatedAt time.Time
 	UpdatedAt time.Time
 
-	Users []*UserBaseResponse
+	Users []UserBaseResponse
 }
 
 // }}}
@@ -93,7 +93,7 @@ type EventRetrieved struct {
 	Name        string
 	Description string
 
-	Users []*UserBaseRetrieved
+	Users []UserBaseRetrieved
 
 	TotalAmount     Money
 	DefaultCurrency Currency
@@ -121,9 +121,9 @@ type Event struct {
 	Description string
 
 	// lazy get using participation join
-	Users []*UserDO
+	Users []UserDO
 	// lazy get
-	Expenses []*Expense
+	Expenses []Expense
 
 	TotalAmount     Money
 	DefaultCurrency Currency

internal/howmuch/model/expense.go

@@ -53,7 +53,26 @@ type ExpenseGetResponse Expense
 // }}}
 // {{{ Retrieved
 
-type ExpensesListRetrieved ExpensesListResponse
+type (
+	ExpensesListRetrieved ExpensesListResponse
+	ExpenseRetrieved      Expense
+)
+
+type PaymentRetrieved struct {
+	PayerID        int    `json:"payer_id"`
+	PayerFirstName string `json:"payer_first_name"`
+	PayerLastName  string `json:"payer_last_name"`
+	Amount         int    `json:"amount"`
+	Currency       string `json:"currency"`
+}
+
+type BenefitRetrieved struct {
+	RecipientID        int    `json:"recipient_id"`
+	RecipientFirstName string `json:"recipient_first_name"`
+	RecipientLastName  string `json:"recipient_last_name"`
+	Amount             int    `json:"amount"`
+	Currency           string `json:"currency"`
+}
 
 // }}}
 // {{{ Entity

internal/howmuch/usecase/repo/event.go

@@ -37,7 +37,7 @@ type EventRepository interface {
 	GetByID(ctx context.Context, eventID int) (*model.EventRetrieved, error)
 
 	// related to events of a user
-	ListEventsByUserID(ctx context.Context, userID int) ([]*model.EventListRetrieved, error)
+	ListEventsByUserID(ctx context.Context, userID int) ([]model.EventListRetrieved, error)
 }
 
 type ExpenseRepository interface {