从 Eloquent 集合中删除不匹配的条件记录
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【中文标题】从 Eloquent 集合中删除不匹配的条件记录【英文标题】：Remove unmatched criteria records from Eloquent collection 【发布时间】：2021-07-15 08:58:58 【问题描述】：我在使用 Eloquent Eager Loading 时遇到了一些问题。我添加了whereHas 以删除博客不符合评论条件但评论仍然返回空数组。我的意图是将其从 json 记录中完全删除。
怎样才能彻底去掉不符合我条件的json数据链？
我当前的代码：
User::select("id", "name", "email")
->with(['blog', 'blog.author', 'blog.comments' => function ($query)
$query->where('comment', 'John is here');
, 'blog.comments.owner'])
->whereHas('blog.comments', function ($query)
$query->where('comment', 'John is Here');
)
->get();
我当前的 json 输出是：
"id": 1,
"name": "John Smith",
"email": "john.smith@hotmail.com",
"blog": [
"id": 1,
"created_at": "2021-04-09T18:08:06.000000Z",
"updated_at": "2021-04-09T10:33:03.000000Z",
"title": "First Blog",
"description": "Awesome",
"users_id": 1,
"cover": null,
"author":
"id": 1,
"name": "John Smith",
"email": "john.smith@hotmail.com",
"email_verified_at": null,
"created_at": "2021-04-08T13:29:13.000000Z",
"updated_at": "2021-04-08T13:29:13.000000Z",
"role": 0
,
"comments": [
"id": 1,
"comment": "John is here",
"blog_id": 1,
"user_id": 1,
"created_at": null,
"updated_at": null,
"owner":
"id": 1,
"name": "John Smith",
"email": "john.smith@hotmail.com",
"email_verified_at": null,
"created_at": "2021-04-08T13:29:13.000000Z",
"updated_at": "2021-04-08T13:29:13.000000Z",
"role": 0
]
,
"id": 6,
"created_at": "2021-04-12T07:41:43.000000Z",
"updated_at": "2021-04-12T08:01:18.000000Z",
"title": "Second Blog",
"description": "Awesome",
"users_id": 1,
"cover": "images/json_1618213303.png",
"author":
"id": 1,
"name": "John Smith",
"email": "john.smith@hotmail.com",
"email_verified_at": null,
"created_at": "2021-04-08T13:29:13.000000Z",
"updated_at": "2021-04-08T13:29:13.000000Z",
"role": 0
,
"comments": []
]
我的预期输出是：
"id": 1,
"name": "John Smith",
"email": "john.smith@hotmail.com",
"blog": [
"id": 1,
"created_at": "2021-04-09T18:08:06.000000Z",
"updated_at": "2021-04-09T10:33:03.000000Z",
"title": "First Blog",
"description": "Awesome",
"users_id": 1,
"cover": null,
"author":
"id": 1,
"name": "John Smith",
"email": "john.smith@hotmail.com",
"email_verified_at": null,
"created_at": "2021-04-08T13:29:13.000000Z",
"updated_at": "2021-04-08T13:29:13.000000Z",
"role": 0
,
"comments": [
"id": 1,
"comment": "John is here",
"blog_id": 1,
"user_id": 1,
"created_at": null,
"updated_at": null,
"owner":
"id": 1,
"name": "John Smith",
"email": "john.smith@hotmail.com",
"email_verified_at": null,
"created_at": "2021-04-08T13:29:13.000000Z",
"updated_at": "2021-04-08T13:29:13.000000Z",
"role": 0
]
]
【问题讨论】：
能否将->get() 替换为->toSql() 并共享正在运行的SQL？
select id, name, email from users where exists (select * from blogs where users.id = blogs.@98765433存在（从comments 中选择*，其中blogs.id = comments.blog_id 和comment = ?)）
我虽然会执行内连接
这有点不合我意，我的意思是，我帮不了你太多了，对不起
【参考方案1】：
试试这个，
User::select("id", "name", "email")
->with([
'blog' => function ($query)
$query->whereHas('comments', function ($query)
$query->where('comment', 'John is Here');
);
,
'blog.comments' => function ($query)
$query->where('comment', 'John is here');
,
'blog.author',
'blog.comments.owner'])
->get();
您也应该对blog 急切加载应用约束。您的查询仅过滤 comments 的 blog
【讨论】：
我有一个关于 eloquent 模型的问题，我如何构建一个与 eloquent 模型合并的连接查询，但输出必须将我作为集合返回。我曾尝试使用类似 "User::join("user_role","id","=","user.role_id")" 的东西，但是当有人决定更改表名时，这可能会导致另一个问题，它可能会直接崩溃整个代码。 我建议像$user->roles 那样访问相关记录，但您首先必须定义User 模型和Role 之间的多对多roles 关系。以上是关于从 Eloquent 集合中删除不匹配的条件记录的主要内容，如果未能解决你的问题，请参考以下文章