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ArticleManager um LIKES erweitert...

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Einführung einer dynamischen Like-Funktion für Beiträge
This commit is contained in:
NOrtmann1
2026-06-17 12:26:18 +02:00
parent 4f8d11881d
commit 3d50e6e3b3
3 changed files with 142 additions and 14 deletions
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php/model/Article.php
+39 -10
View File
@@ -7,13 +7,14 @@
*/
class Article
{
public $id;
public $title;
public $content;
public $author;
public $creationDate;
public $category;
public $tags;
private $id;
private $title;
private $content;
private $author;
private $creationDate;
private $category;
private $tags;
private $likes;
/**
* Konstruktor
@@ -26,7 +27,7 @@ class Article
* @param $tags string optionale Schlagworte für eine bessere Suche
* @param $creationDate string Datum der Beitragserstellung
*/
public function __construct(int $id, string $title, string $content, string $author, string $category, string $tags, string $creationDate)
public function __construct(int $id, string $title, string $content, string $author, string $category, string $tags, string $creationDate, array $likes = [])
{
$this->id = $id;
$this->title = $title;
@@ -35,6 +36,7 @@ class Article
$this->creationDate = $creationDate;
$this->category = $category;
$this->tags = $tags;
$this->likes = $likes;
}
/**
@@ -67,7 +69,7 @@ class Article
/**
* Gibt den Content eines Beitrags zurück.
* TODO: Content muss noch definiert werden.
*
* @return string
*/
public function getContent(): string
@@ -77,7 +79,7 @@ class Article
/**
* Setzt den Content eines Beitrags.
* TODO: Content muss noch definiert werden.
*
* @param $content
* @return void
*/
@@ -141,7 +143,34 @@ class Article
$this->tags = $tags;
}
/**
* Gibt alle User-IDs zurück, die diesen Beitrag geliked haben.
* @return array
*/
public function getLikes(): array
{
return $this->likes;
}
/**
* Gibt die Gesamtzahl der Likes zurück.
* @return int
*/
public function getLikeCount(): int
{
return count($this->likes);
}
/**
* Prüft, ob ein bestimmter Nutzer den Beitrag bereits geliked hat.
*
* @param string $userId
* @return bool
*/
public function hasLiked(string $userId): bool
{
return in_array($userId, $this->likes);
}
}
?>
php/model/ArticleManagerDAO.php
+12
View File
@@ -92,6 +92,18 @@ interface ArticleManagerDAO
*/
public function getArticlesByCategory($category);
/**
* Registriert oder entfernt ein Like eines Nutzers für einen Beitrag.
* Wenn schon geliked -> Unlike
* Wenn noch nicht geliked -> Like
*
* @param int $articleId Die ID des Beitrags
* @param string $userId Die ID des Nutzers
* @return bool True wenn geliked, False wenn unliked
* @throws InternalServerErrorException
* @throws NotFoundException
*/
public function toggleLike(int $articleId, string $userId): bool;
}
?>
php/model/DatabaseArticleManager.php
+91 -4
View File
@@ -23,6 +23,7 @@ class DatabaseArticleManager implements ArticleManagerDAO {
$db = $this->getConnection();
// Tabelle für Beiträge
$db->exec("
CREATE TABLE articles (
id INTEGER PRIMARY KEY AUTOINCREMENT,
@@ -33,6 +34,15 @@ class DatabaseArticleManager implements ArticleManagerDAO {
tags TEXT,
created TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);");
// Tabelle für Likes
$db->exec("
CREATE TABLE likes (
article_id INTEGER,
user_id TEXT,
PRIMARY KEY (article_id, user_id),
FOREIGN KEY (article_id) REFERENCES articles(id) ON DELETE CASCADE
);");
unset($db);
} catch (PDOException $e) {
throw new InternalServerErrorException($e->getMessage());
@@ -189,6 +199,8 @@ class DatabaseArticleManager implements ArticleManagerDAO {
$row = $command->fetch(PDO::FETCH_ASSOC);
if ($row) {
$likes = $this->getLikesForArticle(intval($row['id']));
return new Article(
intval($row['id']),
$row['title'],
@@ -196,7 +208,8 @@ class DatabaseArticleManager implements ArticleManagerDAO {
$row['author'],
$row['category'],
$row['tags'],
$row['created']
$row['created'],
$likes
);
}
@@ -254,6 +267,8 @@ class DatabaseArticleManager implements ArticleManagerDAO {
$filteredArticles = [];
foreach ($rows as $row) {
$likes = $this->getLikesForArticle(intval($row['id']));
$filteredArticles[] = new Article(
intval($row['id']),
$row['title'],
@@ -261,7 +276,8 @@ class DatabaseArticleManager implements ArticleManagerDAO {
$row['author'],
$row['category'],
$row['tags'],
$row['created']
$row['created'],
$likes
);
}
@@ -287,6 +303,8 @@ class DatabaseArticleManager implements ArticleManagerDAO {
$filteredArticles = [];
foreach ($rows as $row) {
$likes = $this->getLikesForArticle(intval($row['id']));
$filteredArticles[] = new Article(
intval($row['id']),
$row['title'],
@@ -294,7 +312,8 @@ class DatabaseArticleManager implements ArticleManagerDAO {
$row['author'],
$row['category'],
$row['tags'],
$row['created']
$row['created'],
$likes
);
}
@@ -341,6 +360,8 @@ class DatabaseArticleManager implements ArticleManagerDAO {
$filteredArticles = [];
foreach ($rows as $row) {
$likes = $this->getLikesForArticle(intval($row['id']));
$filteredArticles[] = new Article(
intval($row['id']),
$row['title'] ?? '',
@@ -348,7 +369,8 @@ class DatabaseArticleManager implements ArticleManagerDAO {
$row['author'] ?? '',
$row['category'] ?? '',
$row['tags'] ?? '',
$row['created'] ?? '' // Nutzt 'created' aus deiner DB-Struktur
$row['created'] ?? '',
$likes
);
}
@@ -359,4 +381,69 @@ class DatabaseArticleManager implements ArticleManagerDAO {
}
}
/**
* Holt alle User-IDs, die einen bestimmten Beitrag geliked haben.
*
* @return String[] UserIDs
* @throws InternalServerErrorException
*/
private function getLikesForArticle(int $articleId): array
{
try {
$db = $this->getConnection();
$sql = "SELECT user_id FROM likes WHERE article_id = :article_id;";
$command = $db->prepare($sql);
$command->execute([':article_id' => $articleId]);
return $command->fetchAll(PDO::FETCH_COLUMN) ?: [];
} catch (PDOException $e) {
return [];
}
}
public function toggleLike(int $articleId, string $userId): bool
{
// prüfen, ob der Artikel überhaupt existiert
$article = $this->getArticle($articleId);
if (!$article) {
throw new NotFoundException("missing_id");
}
try {
$db = $this->getConnection();
// prüfen, ob das Like bereits existiert
$checkSql = "SELECT COUNT(*) FROM likes WHERE article_id = :article_id AND user_id = :user_id;";
$checkCommand = $db->prepare($checkSql);
$checkCommand->execute([
':article_id' => $articleId,
':user_id' => $userId
]);
$hasLiked = (int)$checkCommand->fetchColumn() > 0;
if ($hasLiked) {
// wenn bereits geliked -> Unlike
$deleteSql = "DELETE FROM likes WHERE article_id = :article_id AND user_id = :user_id;";
$deleteCommand = $db->prepare($deleteSql);
$deleteCommand->execute([
':article_id' => $articleId,
':user_id' => $userId
]);
return false; // gibt false zurück, da der Beitrag jetzt nicht mehr geliked ist
} else {
// wenn noch nicht geliked -> Like
$insertSql = "INSERT INTO likes (article_id, user_id) VALUES (:article_id, :user_id);";
$insertCommand = $db->prepare($insertSql);
$insertCommand->execute([
':article_id' => $articleId,
':user_id' => $userId
]);
return true; // gibt true zurück, da der Beitrag jetzt geliked ist
}
} catch (PDOException $e) {
throw new InternalServerErrorException("internal_error");
}
}
}