我目前正在开发一个使用5星评级的书评系统。我想为每个评论用户帖子添加评级系统。因此，我创建了一个表来存储每个费率和当前被评级的bookId，以及id，review和发布的userId如下：
id Review rating AppUser_id Book_id
46 reviw1 2 6 23
53 reviw2 3 6 23
以下是明星的html：
{% if UserId >0 %}
<form class="form-signin" action="/BookReview{% if ReviewId != -1 %}/{{ ReviewId }}{% endif %}/{{ act }}" method="POST">
<h2 class="form-signin-heading">Please Post Your Review</h2>
<label for="Review" class="sr-only">Review</label>
<textarea name="review" id="Review" class="form-control" placeholder="Your Review Here" required autofocus>{{ review }}</textarea>
<button class="btn btn-lg btn-primary btn-block" type="submit" >Submit</button>
<fieldset class="rating">
<input type="radio" id="star5" name="rating5" value="5" /><label for="star5" title="Rocks!">5 stars</label>
<input type="radio" id="star4" name="rating4" value="4" /><label for="star4" title="Pretty good">4 stars</label>
<input type="radio" id="star3" name="rating3" value="3" /><label for="star3" title="Meh">3 stars</label>
<input type="radio" id="star2" name="rating2" value="2" /><label for="star2" title="Kinda bad">2 stars</label>
<input type="radio" id="star1" name="rating1" value="1" /><label for="star1" title="Sucks big time">1 star</label>
</fieldset>
</form>
{% endif %}
以下是控制器：
if ($request->getMethod() == 'POST' and $act == -1) {
$em = $this->getDoctrine()->getManager();
$review = $request->request->get('review');
$review = $request->request->get('BookId');
$rate1 = $request->request->get('rating1');
$rate2 = $request->request->get('rating2');
$rate3 = $request->request->get('rating3');
$rate4 = $request->request->get('rating4');
$rate5 = $request->request->get('rating5');
$br = new BookReview();
$br->setReview($review);
$repository = $this->getDoctrine()->getRepository('AppBundle:AppUser');
$User = $repository->findOneBy(array('id' => $userId));
$br->setAppUser($User);
$br->setBook($book);
if($rate1)
{
$br->setRating(1);
}elseif($rate2)
{
$br->setRating(2);
}elseif($rate3)
{
$br->setRating(3);
}elseif($rate4)
{
$br->setRating(4);
}elseif($rate5)
{
$br->setRating(5);
}
$em->persist($br);
$em->flush();
$request->getSession()->getFlashBag()->add('success', 'Review Added');
return array('book' => $book, 'reviews' => $book->getBookReviews(), 'Title' => '', 'Message' => '', 'id' => $userId, 'review' => '', 'ReviewId' => $ReviewId, 'act' => $act);
}
这是我的问题，如何检查用户之前是否对同一本书进行了评分，如果他之前已经对该书进行了评分，那么使用上述控制器上完全提供的代码部分设置费率：
if($rate1)
{
$br->setRating(1);
}elseif($rate2)
{
$br->setRating(2);
}elseif($rate3)
{
$br->setRating(3);
}elseif($rate4)
{
$br->setRating(4);
}elseif($rate5)
{
$br->setRating(5);
}
第二个问题是如何计算书籍的总体平均评分。我正在使用symfony2（PHP）
以下是我的尝试似乎不起作用：
$br = new BookReview();
$br->setReview($review);
$repository = $this->getDoctrine()->getRepository('AppBundle:AppUser');
$User = $repository->findOneBy(array('id' => $userId));
$br->setAppUser($User);
$br->setBook($book);
$book_id = $br->getBook(); $request->request->get('book_id');
$user_id = $br->getAppUser(); $request->request->get('user_id');
$query = $em->createQuery('SELECT br FROM AppBundle:BookReview br WHERE (br.Book = ' . $book_id . ' and br.AppUser = ' . $user_id . ')');
$results = $query->getResult();
if ($results){
$request->getSession()->getFlashBag()->add('success', 'no Added');
}
else{
if($rate1)
{
$br->setRating(1);
}elseif($rate2)
{
$br->setRating(2);
}elseif($rate3)
{
$br->setRating(3);
}elseif($rate4)
{
$br->setRating(4);
}elseif($rate5)
{
$br->setRating(5);
}
}
答案 0 :(得分：1)
首先你的控制器和视图看起来有点凌乱。您需要为评级字段提供不同的名称？它是单选按钮。只需为所有单选按钮设置相同的名称即可。然后，您将不需要if-else条件来确定选择了哪个评级值。
要知道用户是否已经查看了某些书籍，您是否需要知道是否存在具有此类user_id和book_id的条目。这种检索不需要返回结果中的对象，并且执行简单的sql以获得具有适当值的行数要容易得多。您可以使用控制器中的database_connection服务来执行此操作：
$this->get('database_connection')
->fetchColumn('select count(*) as cnt
from book_reviews
where user_id = ? and book_id = ?', array($userId, $bookId));
或者来自存储库：
public function userHasAlreadyReviewedBook($userId, $bookId)
{
$connection = $this->getEntityManager()->getConnection();
$query = 'select count(*) as cnt
from book_reviews
where user_id = ? and book_id = ?';
return $connection->fetchColumn($query, array($userId, $bookId)) > 0;
}
或者您可以为此类操作指定特殊服务并注入＆＃39; database_connection＆＃39;进入它。
如果上述请求将返回大于零的内容，则用户已经查看了该书。
要获得书评评级的平均值，您可以再次使用database_connection服务（当然，如果您不需要在某些复杂的数据集中使用此值）：
对于评论中的每本书：
$connection->fetchAll('select avg(rating) as average_rating
from book_reviews
group by book_id');
或某些特别的书：
$connection->fetchColumn('select avg(rating) as average_rating
from book_reviews
where book_id = ?', array($bookId));
希望这会有所帮助。
答案 1 :(得分：0)
在您的存储库中，您可以添加以下内容：
public function getCurrentRated($bookId, $userId)
{
$sql = 'SELECT avg(rating) as totalRated FROM your_table WHERE AppUser_id = :userId and Book_id = :bookId group by Book_id';
$params = array(
'userId' => $userId,
'bookId' => $bookId,
);
return $this->getEntityManager()->getConnection()->executeQuery($sql, $params)->fetchAll();
}
然后在你的控制器中调用它：
$currentRated = $repository->getCurrentRated($bookId, $userId);
答案 2 :(得分：0)
首先，我强烈建议您为所有收音机输入提供rating（不是rating1，rating2，...）的名称。这样，您就可以通过获取$request->request->get('rating')的值来了解用户对该图书的评分。
现在如何检查用户是否已对该图书进行评分？使用此查询：
$repository = $this->getDoctrine()->getRepository('AppBundle:BookReview');
$bookReview = $repository->findOneBy(array('AppUser_id' => $userId, 'Book_id' => $bookId));
if (!$bookReview) {
$bookReview = new BookReview();
$bookReview->setUser($user);
$bookReview->setBook($book);
$this->getDoctrine()->getManager()->persist();
}
$bookReview->setRating($request->request->get('rating'));
$this->getDoctrine()->getManager()->flush();