[英]Doctrine DQL join tables
for my API development I use apigility and doctrine . 对于我的API开发,我使用功能性和学说 。 I'm currently programming an endpoint that users can like a post. 我目前正在编程一个用户可以喜欢发布的端点。 Every post has an author. 每个帖子都有一位作者。 I have 2 tables with the following columns and example data inside: 我有2个表,其中包含以下列和示例数据:
Action 行动
id post_id user_id createdAt
1 10 1 0000-00-00 00:00:00
2 12 2 0000-00-00 00:00:00
3 13 3 0000-00-00 00:00:00
(post_id = foreign key to post table) (user_id = source user which likes a post) (post_id =发布表的外键) (user_id =喜欢发布的源用户)
Post 发布
id user_id createdAt
10 62 0000-00-00 00:00:00
12 4 0000-00-00 00:00:00
13 4 0000-00-00 00:00:00
(user_id = foreign key to user table) (user_id =用户表的外键)
What I need 我需要的
I need the total_likes which an author (user_id) has. 我需要作者(user_id)拥有的total_likes。 This can be queried over the Action table by joining the post table. 可以通过加入post表在Action表中查询。 I have already tried to create a DQL query for this: 我已经尝试为此创建一个DQL查询:
// Get total likes an autor has received
$queryBuilder->select('count(p)')
->from('Db\Entity\Action', 'a')
->leftJoin('p.post', 'p')
->where('p.user = :user')
->setParameter('user', $targetUser);
$totalLikes = $queryBuilder->getQuery()->getSingleScalarResult();
Which this query, I get the wrong number of total_likes: 在此查询中,我得到了错误的total_likes数量:
{
"total_likes": "2"
}
How do I have to correct this query that I get the correct count of likes of a user? 我该如何更正此查询,以获取正确的用户点赞次数? With the example table data, the total_likes of user_id=62 should give me this back: 使用示例表数据,user_id = 62的total_likes应该给我以下信息:
{
"total_likes": "1"
}
Try this: 尝试这个:
// Get total likes an autor has received
$queryBuilder
->select('count(p)')
->from('Db\Entity\Action', 'a')
->leftJoin(
'Db\Entity\Post',
'p',
\Doctrine\ORM\Query\Expr\Join::WITH,
'a.post = p.id'
)
->where('p.user = :user')
->setParameter('user', $users);
$totalLikes = $queryBuilder->getQuery()->getSingleScalarResult();
}
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