How to save data with association in gorm golang? - go

Question

So, I want to save the movies and movie_genres data, but it always fails, which is stored in the database is the movies table as much as looping movie_genres, and the movie_genres column with the wrong movies ID. This is the result
movies table
movie_genres table
This the JSON result from frontend
{
"title":"Qui aut consectetur",
"release_date":"1974-11-25",
"runtime":"91",
"mpaa_rating":"PG",
"rating":"2",
"description":
"Anim dolor molestias",
"genre_id":["1","2"]
}
Below is my code on go
models
type Movie struct {
ID int `json:"id"`
Title string `json:"title"`
Description string `json:"description"`
Year int `json:"year"`
ReleaseDate time.Time `json:"release_date"`
Runtime int `json:"runtime"`
Rating int `json:"rating"`
MPAARating string `json:"mpaa_rating"`
CreatedAt time.Time `json:"created_at"`
UpdatedAt time.Time `json:"updated_at"`
Genres []Genre `json:"genres" gorm:"many2many:movie_genres"`
MovieGenre []MovieGenre `json:"movie_genres" gorm:"many2many:movie_genres"`
}
type Genre struct {
ID int `json:"id"`
GenreName string `json:"name"`
Movies []Movie `json:"movies" gorm:"many2many:movie_genres"`
CreatedAt time.Time `json:"-"`
UpdatedAt time.Time `json:"-"`
}
type MovieGenre struct {
ID int `json:"id"`
MovieID int `json:"movie_id"`
Movie Movie `gorm:"foreignKey:MovieID"`
GenreID int `json:"genre_id"`
Genre Genre `gorm:"foreignKey:GenreID"`
CreatedAt time.Time `json:"-"`
UpdatedAt time.Time `json:"-"`
}
handler.go
func (app *Application) CreateMovies(ctx *gin.Context) {
var payload web.MoviePayloadResponse
if err := ctx.BindJSON(&payload); err != nil {
log.Println(err)
return
}
var movieGenre models.MovieGenre
movieGenre.Movie.ID, _ = strconv.Atoi(payload.ID)
movieGenre.Movie.Title = payload.Title
movieGenre.Movie.Description = payload.Description
movieGenre.Movie.ReleaseDate, _ = time.Parse("2006-01-02", payload.ReleaseDate)
movieGenre.Movie.Year = movieGenre.Movie.ReleaseDate.Year()
movieGenre.Movie.Runtime, _ = strconv.Atoi(payload.Runtime)
movieGenre.Movie.Rating, _ = strconv.Atoi(payload.Rating)
movieGenre.Movie.MPAARating = payload.MPAARating
movieGenre.Movie.CreatedAt = time.Now()
movieGenre.Movie.UpdatedAt = time.Now()
movieGenre.ID, _ = strconv.Atoi(payload.ID)
movieGenre.MovieID = movieGenre.Movie.ID
movieGenre.CreatedAt = time.Now()
movieGenre.UpdatedAt = time.Now()
err := app.models.Repository.CreateMovie(movieGenre.Movie)
if err != nil {
panic(err)
}
for _, v := range payload.GenreID {
movieGenre.GenreID, _ = strconv.Atoi(v)
err := app.models.Repository.CreateMovieGenres(movieGenre)
if err != nil {
panic(err)
}
}
ctx.JSON(http.StatusOK, &gin.H{
"ok": "response",
})
return
}
repository.go
func (MovieRepositoryImpl *MovieRepositoryImpl) CreateMovie(movie Movie) error {
MovieRepositoryImpl.DB.Create(&movie)
return nil
}
func (MovieRepositoryImpl *MovieRepositoryImpl) CreateMovieGenres(movieGenre MovieGenre) error {
MovieRepositoryImpl.DB.Create(&movieGenre)
return nil
}
payload
type MoviePayloadResponse struct {
ID string `json:"id"`
Title string `json:"title"`
Description string `json:"description"`
Year string `json:"year"`
ReleaseDate string `json:"release_date"`
Runtime string `json:"runtime"`
Rating string `json:"rating"`
MPAARating string `json:"mpaa_rating"`
GenreID []string `json:"genre_id"`
CreatedAt string `json:"created_at"`
UpdatedAt string `json:"updated_at"`
}
The results that I expect are in the movies table, only 1 column is made, and in the movie_genres table store data movies as much as the genre inputted with the new movies ID. How to solve the problem?