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package models
import (
"database/sql"
"log"
"time"
)
// User is a model for users.
type User struct {
ID int
Name string
Email string
Password []byte
}
// Article is a model for articles.
type Article struct {
ID int
Image string
Slug string
Title string
Content string
Author User
CreatedAt time.Time
}
var (
// Db is a database connection.
Db *sql.DB
// Err is an error returned.
Err error
)
// FindArticle is to print an article.
func FindArticle(slug string) *Article {
rows, err := Db.Query(`SELECT articles.image, articles.title, articles.content, users.name, articles.created_at FROM articles JOIN users ON users.id = articles.author WHERE slug = ?`, slug)
if err != nil {
log.Fatal(err)
}
defer rows.Close()
var createdAt []byte
user := &User{}
article := &Article{}
for rows.Next() {
err = rows.Scan(&article.Image, &article.Title, &article.Content, &user.Name, &createdAt)
if err != nil {
log.Fatal(err)
}
parsedCreatedAt, err := time.Parse("2006-01-02 15:04:05", string(createdAt))
if err != nil {
log.Fatal(err)
}
article.CreatedAt = parsedCreatedAt
article.Author = *user
}
return article
}
// Articles is a list of all articles.
func Articles() []*Article {
var articles []*Article
rows, err := Db.Query(`SELECT articles.id, articles.image, articles.slug, articles.title, articles.content, users.name, articles.created_at FROM articles JOIN users ON users.id = articles.author`)
if err != nil {
log.Fatal(err)
}
defer rows.Close()
for rows.Next() {
var (
id int
image string
slug string
title string
content string
author string
createdAt []byte
)
err = rows.Scan(&id, &image, &slug, &title, &content, &author, &createdAt)
if err != nil {
log.Fatal(err)
}
parsedCreatedAt, err := time.Parse("2006-01-02 15:04:05", string(createdAt))
if err != nil {
log.Fatal(err)
}
user := User{
Name: author,
}
articles = append(articles, &Article{id, image, slug, title, content, user, parsedCreatedAt})
}
return articles
}
// Find finds a user by email.
func (user User) Find() *User {
rows, err := Db.Query(`SELECT * FROM users WHERE email = ?`, user.Email)
if err != nil {
log.Fatal(err)
}
defer rows.Close()
for rows.Next() {
err = rows.Scan(&user.ID, &user.Name, &user.Email, &user.Password)
if err != nil {
log.Fatal(err)
}
}
return &user
}
// FindArticle finds an user article by ID.
func (user User) FindArticle(id int) *Article {
rows, err := Db.Query(`SELECT image, slug, title, content, created_at FROM articles WHERE id = ? AND author = ?`, id, user.ID)
if err != nil {
log.Fatal(err)
}
defer rows.Close()
var createdAt []byte
article := &Article{
ID: id,
Author: user,
}
for rows.Next() {
err = rows.Scan(&article.Image, &article.Slug, &article.Title, &article.Content, &createdAt)
if err != nil {
log.Fatal(err)
}
parsedCreatedAt, err := time.Parse("2006-01-02 15:04:05", string(createdAt))
if err != nil {
log.Fatal(err)
}
article.CreatedAt = parsedCreatedAt
}
return article
}
// FindArticles finds user articles.
func (user User) FindArticles() []*Article {
var articles []*Article
rows, err := Db.Query(`SELECT id, image, slug, title, content, created_at FROM articles WHERE author = ?`, user.ID)
if err != nil {
log.Fatal(err)
}
defer rows.Close()
for rows.Next() {
var (
id int
image string
slug string
title string
content string
createdAt []byte
)
err = rows.Scan(&id, &image, &slug, &title, &content, &createdAt)
if err != nil {
log.Fatal(err)
}
parsedCreatedAt, err := time.Parse("2006-01-02 15:04:05", string(createdAt))
if err != nil {
log.Fatal(err)
}
articles = append(articles, &Article{id, image, slug, title, content, user, parsedCreatedAt})
}
return articles
}
// Create creates a user.
func (user User) Create() *User {
result, err := Db.Exec("INSERT INTO users(name, email, password) VALUES(?, ?, ?)", user.Name, user.Email, user.Password)
if err != nil {
log.Fatal(err)
}
id, err := result.LastInsertId()
if err != nil {
log.Fatal(err)
}
if id != 0 {
user.ID = int(id)
}
return &user
}
// CreateArticle creates an article.
func (user User) CreateArticle(article *Article) {
_, err := Db.Exec(
"INSERT INTO articles(image, slug, title, content, author, created_at) VALUES(?, ?, ?, ?, ?, ?)",
article.Image,
article.Slug,
article.Title,
article.Content,
article.Author.ID,
article.CreatedAt,
)
if err != nil {
log.Fatal(err)
}
}
// UpdateArticle updates an article.
func (user User) UpdateArticle(article *Article) {
_, err := Db.Exec(
"UPDATE articles SET image = ?, slug = ?, title = ?, content = ? WHERE id = ? AND author = ?",
article.Image,
article.Slug,
article.Title,
article.Content,
article.ID,
user.ID,
)
if err != nil {
log.Fatal(err)
}
}
// DeleteArticle deletes an article.
func (user User) DeleteArticle(article *Article) {
_, err := Db.Exec(
"DELETE FROM articles WHERE id = ? AND author = ?",
article.ID,
user.ID,
)
if err != nil {
log.Fatal(err)
}
}
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