포스트를 조회할 때 포스트에 속한 댓글도 함께 조회되도록 포스트 컨트롤러에서 포스트를 조회하는 부분인 getPost() 메서드를 수정하자.

▼ app/controllers/post.go

func getPost(txn *sql.Tx, id int) (models.Post, error) {
    post := models.Post{}
    err := txn.QueryRow(“select id, title, body, created_at, updated_at from posts where id=?”, id).
        Scan(&post.Id, &post.Title, &post.Body, &post.CreatedAt, &post.UpdatedAt)
 

    switch {
    case err == sql.ErrNoRows:
        return post, fmt.Errorf(“No post with that ID - %d.”, id)
    case err != nil:
        return post, err
    }
 

    // 포스트의 댓글 조회
    post.Comments = getComments(txn, id)
 

    return post, nil
}
 
func getComments(txn *sql.Tx, postId int) (comments []models.Comment) {
    rows, err := txn.Query(“select id, body, commenter, post_id, created_at, updated_at from comments where post_id=? order by created_at desc”, postId)
    if err != nil {
        panic(err)
    }
 

    for rows.Next() {
        comment := models.Comment{}
        if err := rows.Scan(&comment.Id, &comment.Body, &comment.Commenter, &comment. PostId, &comment.CreatedAt, &comment.UpdatedAt); err != nil {
            panic(err)
        }
        comments = append(comments, comment)
    }
    return
}

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