GraphQL 查詢字段 post 和 list 返回除 created_at 之外的所有數據。它始終為空。我檢查GetPostBySlug和GetPostList變量，它包含來自 Postgres 的數據。我的錯誤在哪里？模型.gopackage posttype Post struct {    Slug      string `db:"slug"`    Title     string `db:"title"`    Content   string `db:"content"`    Author    string `db:"author"`    Category  string `db:"category"`    CreatedAt string `db:"created_at"`    Published bool   `db:"published"`}存儲庫.gopackage postimport (    "context"    "errors"    "fmt"    "log"    "os"    "time"    "github.com/jackc/pgx/v4"    "github.com/joho/godotenv")var (    db      *pgx.Conn    Info    *log.Logger    Warning *log.Logger    Error   *log.Logger)func init() {    err := godotenv.Load("environment/.env")    if err != nil {        Error.Fatalf("Can't read \".env\" file: %s\n", err.Error())    }    Info = log.New(os.Stdout, "INFO: ", log.Ldate|log.Ltime|log.Lshortfile)    Warning = log.New(os.Stdout, "WARNING: ", log.Ldate|log.Ltime|log.Lshortfile)    Error = log.New(os.Stderr, "ERROR: ", log.Ldate|log.Ltime|log.Lshortfile)    db, err = pgx.Connect(        context.Background(),        fmt.Sprintf(            "postgres://%s:%s@%s:%s/%s",            os.Getenv("POSTGRES_USER"),            os.Getenv("POSTGRES_PASSWORD"),            os.Getenv("POSTGRES_HOST"),            os.Getenv("POSTGRES_PORT"),            os.Getenv("POSTGRES_DB"),        ),    )    if err != nil {        Error.Fatalf("Can't connect to database: %s\n", err.Error())    }}func GetPostBySlug(ctx context.Context, slug string) (result interface{}) {    row, err := db.Query(ctx, "SELECT slug, title, content, author, category, created_at, published FROM posts WHERE slug=$1 LIMIT 1", slug)    if err != nil {        Warning.Printf("GetPostBySlug query: %v\n", err.Error())        return err    }