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問題描述
我試圖雄辯地生成的查詢是
The query I am trying to get eloquent to generate is
SELECT *, (SELECT COUNT(comment_id) FROM comment AS c WHERE c.approved=true AND c.blog_fk=b.blog_id) AS comment_count FROM blog AS b
這是結(jié)果
blog_id | title | author | blog | image | tags | created | updated | comment_count
--------|-------------------|--------------|----------------|------------------|---------|---------------------|---------------------|--------------
21 | A day.. | dsyph3r | Lorem ipsum... | beach.jpg | symf... | 2014-12-22 19:14:34 | 2014-12-22 19:14:34 | 2
22 | The pool .. | Zero Cool | Vestibulum ... | pool_leak.jpg | pool,.. | 2011-07-23 06:12:33 | 2011-07-23 06:12:33 | 10
23 | Misdirection... | Gabriel | Lorem ipsum... | misdirection.jpg | misd... | 2011-07-16 16:14:06 | 2011-07-16 16:14:06 | 2
24 | The grid ... | Kevin Flynn | Lorem commo... | the_grid.jpg | grid... | 2011-06-02 18:54:12 | 2011-06-02 18:54:12 | 0
25 | You're either ... | Gary Winston | Lorem ipsum... | one_or_zero.jpg | bina... | 2011-04-25 15:34:18 | 2011-04-25 15:34:18 | 2
我目前使用 DB::select(DB::raw()) 運(yùn)行它，這可能不是正確的方法.
I currently have this running by using DB::select( DB::raw()) which probably isn't the correct way to do this.
問題是什么才是能夠產(chǎn)生這些結(jié)果的查詢的正確方法?
The question is what is the proper way to get eloquent to produce the query that generates those results?
推薦答案
改用這個:http://softonsofa.com/tweaking-eloquent-relations-how-to-get-hasmany-relation-count-高效
對于嵌套的 select/join 語句，您需要:
$sub = Comment::selectRaw('count(comment_id) as count')
->where('approved', '?')
->where('comment.blog_fk', '?')
->toSql();
Blog::selectRaw(DB::raw("blog.*, ({$sub}) as comment_count"))
->setBindings([true, DB::raw('blog.blog_id')], 'select')
->get();
或者干脆把所有東西都放在selectRaw中.
Or simply put everything in selectRaw.
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