refacto: refacto repo layer code while adding new usecase methods

README.md

@@ -577,3 +577,8 @@ 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`.
+
+### 2024/10/25
+
+Read this [article](https://konradreiche.com/blog/two-common-go-interface-misuses/)
+today, maybe I am abusing the usage of interfaces?

internal/howmuch/adapter/repo/db.go

@@ -25,7 +25,9 @@ package repo
 import (
 	"context"
 	"database/sql"
+	"time"
 
+	"git.vinchent.xyz/vinchent/howmuch/internal/howmuch/adapter/repo/sqlc"
 	"git.vinchent.xyz/vinchent/howmuch/internal/howmuch/usecase/repo"
 	"git.vinchent.xyz/vinchent/howmuch/internal/pkg/log"
 )
@@ -34,6 +36,8 @@ type dbRepository struct {
 	db *sql.DB
 }
 
+const queryTimeout = 3 * time.Second
+
 func NewDBRepository(db *sql.DB) repo.DBRepository {
 	return &dbRepository{
 		db: db,
@@ -66,3 +70,11 @@ func (dr *dbRepository) Transaction(
 	data, err := txFunc(ctx, tx)
 	return data, err
 }
+
+func getQueries(queries *sqlc.Queries, tx any) *sqlc.Queries {
+	transaction, ok := tx.(*sql.Tx)
+	if ok {
+		return sqlc.New(transaction)
+	}
+	return queries
+}

internal/howmuch/adapter/repo/event.go

@@ -26,6 +26,7 @@ import (
 	"context"
 	"database/sql"
 	"encoding/json"
+	"errors"
 	"time"
 
 	"git.vinchent.xyz/vinchent/howmuch/internal/howmuch/adapter/repo/sqlc"
@@ -48,8 +49,35 @@ func NewEventRepository(db *sql.DB) repo.EventRepository {
 func (e *eventRepository) Create(
 	ctx context.Context,
 	evEntity *model.EventEntity,
+	tx any,
 ) (*model.EventEntity, error) {
-	panic("unimplemented")
+	timeoutCtx, cancel := context.WithTimeout(ctx, queryTimeout)
+	defer cancel()
+
+	queries := getQueries(e.queries, tx)
+
+	event, err := queries.InsertEvent(timeoutCtx, sqlc.InsertEventParams{
+		Name:            evEntity.Name,
+		Description:     sql.NullString{String: evEntity.Description, Valid: true},
+		TotalAmount:     sql.NullInt32{Int32: int32(evEntity.TotalAmount), Valid: true},
+		DefaultCurrency: evEntity.DefaultCurrency,
+		OwnerID:         int32(evEntity.OwnerID),
+		CreatedAt:       time.Now(),
+		UpdatedAt:       time.Now(),
+	})
+	if err != nil {
+		return nil, err
+	}
+	return &model.EventEntity{
+		ID:              int(event.ID),
+		Name:            event.Name,
+		Description:     event.Description.String,
+		TotalAmount:     int(event.TotalAmount.Int32),
+		DefaultCurrency: event.DefaultCurrency,
+		OwnerID:         int(event.OwnerID),
+		CreatedAt:       event.CreatedAt,
+		UpdatedAt:       event.UpdatedAt,
+	}, nil
 }
 
 func convToEventRetrieved(eventDTO *sqlc.GetEventByIDRow) (*model.EventRetrieved, error) {
@@ -89,8 +117,17 @@ func convToEventRetrieved(eventDTO *sqlc.GetEventByIDRow) (*model.EventRetrieved
 }
 
 // GetByID implements repo.EventRepository.
-func (e *eventRepository) GetByID(ctx context.Context, eventID int) (*model.EventRetrieved, error) {
+func (e *eventRepository) GetByID(
-	eventDTO, err := e.queries.GetEventByID(ctx, int32(eventID))
+	ctx context.Context,
+	eventID int,
+	tx any,
+) (*model.EventRetrieved, error) {
+	timeoutCtx, cancel := context.WithTimeout(ctx, queryTimeout)
+	defer cancel()
+
+	queries := getQueries(e.queries, tx)
+
+	eventDTO, err := queries.GetEventByID(timeoutCtx, int32(eventID))
 	if err != nil {
 		log.ErrorLog("query error", "err", err)
 		return nil, err
@@ -100,9 +137,9 @@ func (e *eventRepository) GetByID(ctx context.Context, eventID int) (*model.Even
 }
 
 func convToEventList(eventsDTO []sqlc.ListEventsByUserIDRow) ([]model.EventListRetrieved, error) {
-	var events []model.EventListRetrieved
+	events := make([]model.EventListRetrieved, len(eventsDTO))
 
-	for _, evDTO := range eventsDTO {
+	for i, evDTO := range eventsDTO {
 		var owner model.UserBaseRetrieved
 		err := json.Unmarshal(evDTO.Owner, &owner)
 		if err != nil {
@@ -118,7 +155,7 @@ func convToEventList(eventsDTO []sqlc.ListEventsByUserIDRow) ([]model.EventListR
 			CreatedAt:   evDTO.CreatedAt,
 		}
 
-		events = append(events, ev)
+		events[i] = ev
 	}
 
 	return events, nil
@@ -128,8 +165,14 @@ func convToEventList(eventsDTO []sqlc.ListEventsByUserIDRow) ([]model.EventListR
 func (e *eventRepository) ListEventsByUserID(
 	ctx context.Context,
 	userID int,
+	tx any,
 ) ([]model.EventListRetrieved, error) {
-	eventsDTO, err := e.queries.ListEventsByUserID(ctx, int32(userID))
+	timeoutCtx, cancel := context.WithTimeout(ctx, queryTimeout)
+	defer cancel()
+
+	queries := getQueries(e.queries, tx)
+
+	eventsDTO, err := queries.ListEventsByUserID(timeoutCtx, int32(userID))
 	if err != nil {
 		log.ErrorLog("query error", "err", err)
 		return nil, err
@@ -142,8 +185,14 @@ func (e *eventRepository) ListEventsByUserID(
 func (e *eventRepository) UpdateEventByID(
 	ctx context.Context,
 	event *model.EventUpdateEntity,
+	tx any,
 ) error {
-	err := e.queries.UpdateEventByID(ctx, sqlc.UpdateEventByIDParams{
+	timeoutCtx, cancel := context.WithTimeout(ctx, queryTimeout)
+	defer cancel()
+
+	queries := getQueries(e.queries, tx)
+
+	err := queries.UpdateEventByID(timeoutCtx, sqlc.UpdateEventByIDParams{
 		ID:          int32(event.ID),
 		Name:        event.Name,
 		Description: sql.NullString{String: event.Description, Valid: true},
@@ -151,3 +200,77 @@ func (e *eventRepository) UpdateEventByID(
 	})
 	return err
 }
+
+// GetParticipation implements repo.EventRepository.
+func (e *eventRepository) GetParticipation(
+	ctx context.Context,
+	userID, eventID int,
+	tx any,
+) (*model.ParticipationEntity, error) {
+	timeoutCtx, cancel := context.WithTimeout(ctx, queryTimeout)
+	defer cancel()
+
+	queries := getQueries(e.queries, tx)
+
+	partDTO, err := queries.GetParticipation(timeoutCtx, sqlc.GetParticipationParams{
+		UserID:  int32(userID),
+		EventID: int32(eventID),
+	})
+
+	if errors.Is(err, sql.ErrNoRows) {
+		// No error, but participation not found
+		return nil, nil
+	}
+
+	if err != nil {
+		return nil, err
+	}
+
+	return &model.ParticipationEntity{
+		ID:              int(partDTO.ID),
+		UserID:          int(partDTO.UserID),
+		EventID:         int(partDTO.EventID),
+		InvitedByUserID: int(partDTO.InvitedByUserID.Int32),
+		CreatedAt:       partDTO.CreatedAt,
+		UpdatedAt:       partDTO.UpdatedAt,
+	}, nil
+}
+
+// InsertParticipation implements repo.EventRepository.
+func (e *eventRepository) InsertParticipation(
+	ctx context.Context,
+	userID int,
+	eventID int,
+	invitedByUserID int,
+	tx any,
+) (*model.ParticipationEntity, error) {
+	timeoutCtx, cancel := context.WithTimeout(ctx, queryTimeout)
+	defer cancel()
+
+	queries := getQueries(e.queries, tx)
+
+	var invitedBy sql.NullInt32
+	if invitedByUserID == 0 {
+		invitedBy = sql.NullInt32{Int32: 0, Valid: false}
+	} else {
+		invitedBy = sql.NullInt32{Int32: int32(invitedByUserID), Valid: true}
+	}
+	participationDTO, err := queries.InsertParticipation(timeoutCtx, sqlc.InsertParticipationParams{
+		UserID:          int32(userID),
+		EventID:         int32(eventID),
+		InvitedByUserID: invitedBy,
+		CreatedAt:       time.Now(),
+		UpdatedAt:       time.Now(),
+	})
+	if err != nil {
+		return nil, err
+	}
+	return &model.ParticipationEntity{
+		ID:              int(participationDTO.ID),
+		UserID:          int(participationDTO.UserID),
+		EventID:         int(participationDTO.EventID),
+		InvitedByUserID: int(participationDTO.InvitedByUserID.Int32),
+		CreatedAt:       participationDTO.CreatedAt,
+		UpdatedAt:       participationDTO.UpdatedAt,
+	}, nil
+}

internal/howmuch/adapter/repo/expense.go

@@ -45,21 +45,39 @@ func NewExpenseRepository(db *sql.DB) repo.ExpenseRepository {
 }
 
 // DeleteExpense implements repo.ExpenseRepository.
-func (e *expenseRepository) DeleteExpense(ctx context.Context, expenseID int) error {
+func (e *expenseRepository) DeleteExpense(ctx context.Context, expenseID int, tx any) error {
-	return e.queries.DeleteExpense(ctx, int32(expenseID))
+	timeoutCtx, cancel := context.WithTimeout(ctx, queryTimeout)
+	defer cancel()
+
+	queries := getQueries(e.queries, tx)
+	return queries.DeleteExpense(timeoutCtx, int32(expenseID))
 }
 
 // DeleteTransactionsOfExpense implements repo.ExpenseRepository.
-func (e *expenseRepository) DeleteTransactionsOfExpense(ctx context.Context, expenseID int) error {
+func (e *expenseRepository) DeleteTransactionsOfExpense(
-	return e.queries.DeleteTransactionsOfExpenseID(ctx, int32(expenseID))
+	ctx context.Context,
+	expenseID int,
+	tx any,
+) error {
+	timeoutCtx, cancel := context.WithTimeout(ctx, queryTimeout)
+	defer cancel()
+
+	queries := getQueries(e.queries, tx)
+	return queries.DeleteTransactionsOfExpenseID(timeoutCtx, int32(expenseID))
 }
 
 // GetExpenseByID implements repo.ExpenseRepository.
 func (e *expenseRepository) GetExpenseByID(
 	ctx context.Context,
 	expenseID int,
+	tx any,
 ) (*model.ExpenseRetrieved, error) {
-	expenseDTO, err := e.queries.GetExpenseByID(ctx, int32(expenseID))
+	timeoutCtx, cancel := context.WithTimeout(ctx, queryTimeout)
+	defer cancel()
+
+	queries := getQueries(e.queries, tx)
+
+	expenseDTO, err := queries.GetExpenseByID(timeoutCtx, int32(expenseID))
 	if err != nil {
 		return nil, err
 	}
@@ -79,15 +97,15 @@ func convToPayments(raw json.RawMessage) ([]model.Payment, error) {
 		return nil, err
 	}
 
-	var payments []model.Payment
+	payments := make([]model.Payment, len(paymentsRetrieved))
-	for _, p := range paymentsRetrieved {
+	for i, p := range paymentsRetrieved {
 		payment := model.Payment{
 			PayerID:        p.PayerID,
 			PayerFirstName: p.PayerFirstName,
 			PayerLastName:  p.PayerLastName,
 			Amount:         model.MakeMoney(p.Amount, model.Currency(p.Currency)),
 		}
-		payments = append(payments, payment)
+		payments[i] = payment
 	}
 
 	return payments, nil
@@ -102,15 +120,15 @@ func convToBenefits(raw json.RawMessage) ([]model.Benefit, error) {
 		return nil, err
 	}
 
-	var benefits []model.Benefit
+	benefits := make([]model.Benefit, len(benefitsRetrieved))
-	for _, b := range benefitsRetrieved {
+	for i, b := range benefitsRetrieved {
 		benefit := model.Benefit{
 			RecipientID:        b.RecipientID,
 			RecipientFirstName: b.RecipientFirstName,
 			RecipientLastName:  b.RecipientLastName,
 			Amount:             model.MakeMoney(b.Amount, model.Currency(b.Currency)),
 		}
-		benefits = append(benefits, benefit)
+		benefits[i] = benefit
 	}
 
 	return benefits, nil
@@ -150,8 +168,14 @@ func convToExpenseRetrieved(expenseDTO *sqlc.GetExpenseByIDRow) (*model.ExpenseR
 func (e *expenseRepository) InsertExpense(
 	ctx context.Context,
 	expenseEntity *model.ExpenseEntity,
+	tx any,
 ) (*model.ExpenseEntity, error) {
-	expenseDTO, err := e.queries.InsertExpense(ctx, sqlc.InsertExpenseParams{
+	timeoutCtx, cancel := context.WithTimeout(ctx, queryTimeout)
+	defer cancel()
+
+	queries := getQueries(e.queries, tx)
+
+	expenseDTO, err := queries.InsertExpense(timeoutCtx, sqlc.InsertExpenseParams{
 		CreatedAt: time.Now(),
 		UpdatedAt: time.Now(),
 		Amount:    int32(expenseEntity.Amount),
@@ -179,13 +203,19 @@ func (e *expenseRepository) InsertExpense(
 func (e *expenseRepository) ListExpensesByEventID(
 	ctx context.Context,
 	id int,
+	tx any,
 ) ([]model.ExpensesListRetrieved, error) {
-	listDTO, err := e.queries.ListExpensesByEventID(ctx, int32(id))
+	timeoutCtx, cancel := context.WithTimeout(ctx, queryTimeout)
+	defer cancel()
+
+	queries := getQueries(e.queries, tx)
+
+	listDTO, err := queries.ListExpensesByEventID(timeoutCtx, int32(id))
 	if err != nil {
 		return nil, err
 	}
-	var res []model.ExpensesListRetrieved
+	res := make([]model.ExpensesListRetrieved, len(listDTO))
-	for _, dto := range listDTO {
+	for i, dto := range listDTO {
 		elem := model.ExpensesListRetrieved{
 			ID:        int(dto.ID),
 			CreatedAt: dto.CreatedAt,
@@ -197,7 +227,7 @@ func (e *expenseRepository) ListExpensesByEventID(
 				Place: dto.Place.String,
 			},
 		}
-		res = append(res, elem)
+		res[i] = elem
 	}
 	return res, nil
 }
@@ -206,8 +236,14 @@ func (e *expenseRepository) ListExpensesByEventID(
 func (e *expenseRepository) UpdateExpenseByID(
 	ctx context.Context,
 	expenseUpdate *model.ExpenseUpdateEntity,
+	tx any,
 ) (*model.ExpenseEntity, error) {
-	expenseDTO, err := e.queries.UpdateExpenseByID(ctx, sqlc.UpdateExpenseByIDParams{
+	timeoutCtx, cancel := context.WithTimeout(ctx, queryTimeout)
+	defer cancel()
+
+	queries := getQueries(e.queries, tx)
+
+	expenseDTO, err := queries.UpdateExpenseByID(timeoutCtx, sqlc.UpdateExpenseByIDParams{
 		ID:        int32(expenseUpdate.ID),
 		UpdatedAt: time.Now(),
 		Amount:    int32(expenseUpdate.Amount),

internal/howmuch/adapter/repo/sqlc/participation.sql

@@ -3,3 +3,8 @@ INSERT INTO participation (
     user_id, event_id, invited_by_user_id, created_at, updated_at
 ) VALUES ($1, $2, $3, $4, $5)
 RETURNING *;
+
+-- name: GetParticipation :one
+SELECT id, user_id, event_id, invited_by_user_id, created_at, updated_at
+FROM "participation"
+WHERE user_id = $1 AND event_id = $2;

internal/howmuch/adapter/repo/sqlc/participation.sql.go

@@ -11,6 +11,31 @@ import (
 	"time"
 )
 
+const getParticipation = `-- name: GetParticipation :one
+SELECT id, user_id, event_id, invited_by_user_id, created_at, updated_at
+FROM "participation"
+WHERE user_id = $1 AND event_id = $2
+`
+
+type GetParticipationParams struct {
+	UserID  int32
+	EventID int32
+}
+
+func (q *Queries) GetParticipation(ctx context.Context, arg GetParticipationParams) (Participation, error) {
+	row := q.db.QueryRowContext(ctx, getParticipation, arg.UserID, arg.EventID)
+	var i Participation
+	err := row.Scan(
+		&i.ID,
+		&i.UserID,
+		&i.EventID,
+		&i.InvitedByUserID,
+		&i.CreatedAt,
+		&i.UpdatedAt,
+	)
+	return i, err
+}
+
 const insertParticipation = `-- name: InsertParticipation :one
 INSERT INTO participation (
     user_id, event_id, invited_by_user_id, created_at, updated_at

internal/howmuch/adapter/repo/sqlc/querier.go

@@ -13,6 +13,7 @@ type Querier interface {
 	DeleteTransactionsOfExpenseID(ctx context.Context, expenseID int32) error
 	GetEventByID(ctx context.Context, id int32) (GetEventByIDRow, error)
 	GetExpenseByID(ctx context.Context, id int32) (GetExpenseByIDRow, error)
+	GetParticipation(ctx context.Context, arg GetParticipationParams) (Participation, error)
 	GetUserByEmail(ctx context.Context, email string) (User, error)
 	GetUserByID(ctx context.Context, id int32) (User, error)
 	InsertEvent(ctx context.Context, arg InsertEventParams) (Event, error)

internal/howmuch/adapter/repo/user.go

@@ -34,43 +34,34 @@ import (
 )
 
 type userRepository struct {
-	querier *sqlc.Queries
+	queries *sqlc.Queries
 }
 
-const insertTimeout = 1 * time.Second
-
 func NewUserRepository(db *sql.DB) repo.UserRepository {
 	return &userRepository{
-		querier: sqlc.New(db),
+		queries: sqlc.New(db),
 	}
 }
 
 // Create
-func (ur *userRepository) Create(
+func (u *userRepository) Create(
 	ctx context.Context,
-	transaction interface{},
+	userEntity *model.UserEntity,
-	u *model.UserEntity,
+	tx any,
 ) (*model.UserEntity, error) {
-	timeoutCtx, cancel := context.WithTimeout(ctx, insertTimeout)
+	timeoutCtx, cancel := context.WithTimeout(ctx, queryTimeout)
 	defer cancel()
 
-	args := sqlc.InsertUserParams{
+	queries := getQueries(u.queries, tx)
-		Email:     u.Email,
+
-		FirstName: u.FirstName,
+	userDB, err := queries.InsertUser(timeoutCtx, sqlc.InsertUserParams{
-		LastName:  u.LastName,
+		Email:     userEntity.Email,
-		Password:  u.Password,
+		FirstName: userEntity.FirstName,
+		LastName:  userEntity.LastName,
+		Password:  userEntity.Password,
 		CreatedAt: time.Now(),
 		UpdatedAt: time.Now(),
-	}
+	})
-
-	tx, ok := transaction.(*sql.Tx)
-	if !ok {
-		return nil, errors.New("transaction is not a *sql.Tx")
-	}
-
-	queries := sqlc.New(tx)
-
-	userDB, err := queries.InsertUser(timeoutCtx, args)
 	if err != nil {
 		return nil, err
 	}
@@ -87,8 +78,17 @@ func (ur *userRepository) Create(
 }
 
 // GetByEmail if not found, return nil for user but not error.
-func (ur *userRepository) GetByEmail(ctx context.Context, email string) (*model.UserEntity, error) {
+func (u *userRepository) GetByEmail(
-	userDB, err := ur.querier.GetUserByEmail(ctx, email)
+	ctx context.Context,
+	email string,
+	tx any,
+) (*model.UserEntity, error) {
+	timeoutCtx, cancel := context.WithTimeout(ctx, queryTimeout)
+	defer cancel()
+
+	queries := getQueries(u.queries, tx)
+
+	userDB, err := queries.GetUserByEmail(timeoutCtx, email)
 	if errors.Is(err, sql.ErrNoRows) {
 		// No query error, but user not found
 		return nil, nil
@@ -107,8 +107,13 @@ func (ur *userRepository) GetByEmail(ctx context.Context, email string) (*model.
 	}, nil
 }
 
-func (ur *userRepository) GetByID(ctx context.Context, id int) (*model.UserEntity, error) {
+func (u *userRepository) GetByID(ctx context.Context, id int, tx any) (*model.UserEntity, error) {
-	userDB, err := ur.querier.GetUserByID(ctx, int32(id))
+	timeoutCtx, cancel := context.WithTimeout(ctx, queryTimeout)
+	defer cancel()
+
+	queries := getQueries(u.queries, tx)
+
+	userDB, err := queries.GetUserByID(timeoutCtx, int32(id))
 	if errors.Is(err, sql.ErrNoRows) {
 		// No query error, but user not found
 		return nil, nil

internal/howmuch/model/event.go

@@ -36,7 +36,7 @@ type EventCreateRequest struct {
 // }}}
 // {{{ Response View Object (from service to controller)
 
-type EventBaseItemResponse struct {
+type EventListResponse struct {
 	ID          int
 	Name        string
 	Description string

internal/howmuch/usecase/repo/event.go

@@ -29,30 +29,46 @@ import (
 )
 
 type EventRepository interface {
-	Create(ctx context.Context, evEntity *model.EventEntity) (*model.EventEntity, error)
+	Create(ctx context.Context, evEntity *model.EventEntity, tx any) (*model.EventEntity, error)
 
 	// UpdateEventByID updates the event related information (name, descriptions)
-	UpdateEventByID(ctx context.Context, event *model.EventUpdateEntity) error
+	UpdateEventByID(ctx context.Context, event *model.EventUpdateEntity, tx any) error
 
-	GetByID(ctx context.Context, eventID int) (*model.EventRetrieved, error)
+	GetByID(ctx context.Context, eventID int, tx any) (*model.EventRetrieved, error)
 
 	// related to events of a user
-	ListEventsByUserID(ctx context.Context, userID int) ([]model.EventListRetrieved, error)
+	ListEventsByUserID(ctx context.Context, userID int, tx any) ([]model.EventListRetrieved, error)
 
-	// CheckParticipation(ctx context.Context, userID, eventID int) error
+	InsertParticipation(
+		ctx context.Context,
+		userID, eventID, invitedByUserID int,
+		tx any,
+	) (*model.ParticipationEntity, error)
+
+	GetParticipation(
+		ctx context.Context,
+		userID, eventID int,
+		tx any,
+	) (*model.ParticipationEntity, error)
 }
 
 type ExpenseRepository interface {
-	DeleteExpense(ctx context.Context, expenseID int) error
+	DeleteExpense(ctx context.Context, expenseID int, tx any) error
-	DeleteTransactionsOfExpense(ctx context.Context, expenseID int) error
+	DeleteTransactionsOfExpense(ctx context.Context, expenseID int, tx any) error
-	GetExpenseByID(ctx context.Context, expenseID int) (*model.ExpenseRetrieved, error)
+	GetExpenseByID(ctx context.Context, expenseID int, tx any) (*model.ExpenseRetrieved, error)
 	InsertExpense(
 		ctx context.Context,
 		expenseEntity *model.ExpenseEntity,
+		tx any,
 	) (*model.ExpenseEntity, error)
-	ListExpensesByEventID(ctx context.Context, id int) ([]model.ExpensesListRetrieved, error)
+	ListExpensesByEventID(
+		ctx context.Context,
+		id int,
+		tx any,
+	) ([]model.ExpensesListRetrieved, error)
 	UpdateExpenseByID(
 		ctx context.Context,
 		expenseUpdate *model.ExpenseUpdateEntity,
+		tx any,
 	) (*model.ExpenseEntity, error)
 }

internal/howmuch/usecase/repo/user.go

@@ -31,9 +31,9 @@ import (
 type UserRepository interface {
 	Create(
 		ctx context.Context,
-		transaction interface{},
 		u *model.UserEntity,
+		tx any,
 	) (*model.UserEntity, error)
-	GetByEmail(ctx context.Context, email string) (*model.UserEntity, error)
+	GetByEmail(ctx context.Context, email string, tx any) (*model.UserEntity, error)
-	GetByID(ctx context.Context, id int) (*model.UserEntity, error)
+	GetByID(ctx context.Context, id int, tx any) (*model.UserEntity, error)
 }

internal/howmuch/usecase/usecase/event.go

@@ -62,7 +62,7 @@ func (evuc *eventUsecase) CreateEvent(
 	ctx context.Context,
 	evRequest *model.EventCreateRequest,
 ) (*model.EventInfoResponse, error) {
-	// transfer evRequest to PO
+	// transfer evRequest to evEntity
 
 	evEntity := &model.EventEntity{
 		Name:            evRequest.Name,
@@ -74,12 +74,37 @@ func (evuc *eventUsecase) CreateEvent(
 
 	data, err := evuc.dbRepo.Transaction(
 		ctx,
-		func(txCtx context.Context, tx interface{}) (interface{}, error) {
+		func(txCtx context.Context, tx any) (any, error) {
-			created, err := evuc.eventRepo.Create(ctx, evEntity)
+			// Create the event
+			created, err := evuc.eventRepo.Create(ctx, evEntity, tx)
 			if err != nil {
 				return nil, err
 			}
 
+			// participate to the event
+			participation, err := evuc.eventRepo.InsertParticipation(
+				ctx,
+				created.OwnerID,
+				created.ID,
+				0,
+				tx,
+			)
+			if err != nil {
+				return nil, err
+			}
+
+			if participation == nil {
+				// Unexpected error
+				log.ErrorLog(
+					"participation existed for event-user pair",
+					"userID",
+					created.OwnerID,
+					"eventID",
+					created.ID,
+				)
+				return nil, errno.InternalServerErr
+			}
+
 			// TODO: App log, maybe can be sent to some third party service.
 			log.InfoLog(
 				"created new event",
@@ -89,6 +114,7 @@ func (evuc *eventUsecase) CreateEvent(
 				created.OwnerID,
 			)
 
+			// Construct the response
 			ownerResponse, err := evuc.userUC.GetUserBaseResponseByID(ctx, created.OwnerID)
 			if err != nil {
 				return nil, err
@@ -104,9 +130,12 @@ func (evuc *eventUsecase) CreateEvent(
 				),
 				Owner:     ownerResponse,
 				CreatedAt: created.CreatedAt,
+				UpdatedAt: created.UpdatedAt,
+				Users:     []model.UserBaseResponse{*ownerResponse},
 			}
 			return evResponse, err
-		})
+		},
+	)
 	if err != nil {
 		return nil, err
 	}
@@ -119,8 +148,28 @@ func (evuc *eventUsecase) CreateEvent(
 func (evuc *eventUsecase) ListEvents(
 	ctx context.Context,
 	userID int,
-) ([]model.EventBaseItemResponse, error) {
+) ([]model.EventListResponse, error) {
-	return nil, nil
+	eventListRetrieved, err := evuc.eventRepo.ListEventsByUserID(ctx, userID, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	// Check if the user is a member of the event
+
+	responses := make([]model.EventListResponse, len(eventListRetrieved))
+
+	for i, retrieved := range eventListRetrieved {
+		ownner := model.UserBaseResponse(*retrieved.Owner)
+		res := model.EventListResponse{
+			ID:          retrieved.ID,
+			Name:        retrieved.Name,
+			Description: retrieved.Description,
+			Owner:       &ownner,
+			CreatedAt:   retrieved.CreatedAt,
+		}
+		responses[i] = res
+	}
+	return responses, nil
 }
 
 // GetEventDetail

internal/howmuch/usecase/usecase/repomock/testuserrepo.go

@@ -36,8 +36,8 @@ type TestUserRepository struct{}
 
 func (tur *TestUserRepository) Create(
 	ctx context.Context,
-	transaction interface{},
 	u *model.UserEntity,
+	tx any,
 ) (*model.UserEntity, error) {
 	user := *u
 
@@ -53,6 +53,7 @@ func (tur *TestUserRepository) Create(
 func (tur *TestUserRepository) GetByEmail(
 	ctx context.Context,
 	email string,
+	tx any,
 ) (*model.UserEntity, error) {
 	hashedPwd, _ := bcrypt.GenerateFromPassword([]byte("strongHashed"), 12)
 	switch email {
@@ -71,7 +72,11 @@ func (tur *TestUserRepository) GetByEmail(
 	return nil, UserTestDummyErr
 }
 
-func (tur *TestUserRepository) GetByID(ctx context.Context, id int) (*model.UserEntity, error) {
+func (tur *TestUserRepository) GetByID(
+	ctx context.Context,
+	id int,
+	tx any,
+) (*model.UserEntity, error) {
 	hashedPwd, _ := bcrypt.GenerateFromPassword([]byte("strongHashed"), 12)
 	switch id {
 	case 123:

internal/howmuch/usecase/usecase/user.go

@@ -86,12 +86,12 @@ func (uuc *userUsecase) Create(
 	data, err := uuc.dbRepo.Transaction(
 		ctx,
 		func(txCtx context.Context, tx interface{}) (interface{}, error) {
-			created, err := uuc.userRepo.Create(txCtx, tx, &model.UserEntity{
+			created, err := uuc.userRepo.Create(txCtx, &model.UserEntity{
 				Email:     u.Email,
 				Password:  u.Password,
 				FirstName: u.FirstName,
 				LastName:  u.LastName,
-			})
+			}, tx)
 			if err != nil {
 				match, _ := regexp.MatchString("SQLSTATE 23505", err.Error())
 				if match {
@@ -132,7 +132,7 @@ func (uuc *userUsecase) Create(
 }
 
 func (uuc *userUsecase) Exist(ctx context.Context, u *model.UserExistRequest) error {
-	got, err := uuc.userRepo.GetByEmail(ctx, u.Email)
+	got, err := uuc.userRepo.GetByEmail(ctx, u.Email, nil)
 	// Any query error?
 	if err != nil {
 		return err
@@ -160,7 +160,7 @@ func (uuc *userUsecase) GetUserBaseResponseByID(
 	// If not exists, get from the DB. And then put back
 	// into the cache with a timeout.
 	// Refresh the cache when the user data is updated (for now it cannot be updated)
-	got, err := uuc.userRepo.GetByID(ctx, userID)
+	got, err := uuc.userRepo.GetByID(ctx, userID, nil)
 	if err != nil {
 		return nil, err
 	}