如何在 Laravel 上构建合并和构建组查询？

Question

现在我正在使用这个查询来显示下面的结果 查询：

 $data['faculty'] = Faculty::select('faculties.id', 'faculties.faculty', 'faculties.slug', 'faculties.status','s.semester','fs.faculty_id')
->join('faculty_semester as fs', 'faculties.id', '=', 'fs.faculty_id')
->join('semesters as s', 's.id', '=', 'fs.semester_id')
->orderBy('faculties.faculty', 'asc')
->get();

显示结果

1     BBA      FIRST SEM
2     BBA      SECOND SEM   
3     BBA      FOURTH SEM
4     BBA      THIRD SEM
5     BBS      SECOND YEAR
6     BBS      FIRST YEAR

但我想在群组中显示。 如何在 Laravel 上构建组查询以显示在结果下方

1     BBA      FIRST SEM, 
               SECOND SEM
               THIRD SEM
               FOURTH SEM
2     BBS      FIRST YEAR
               SECOND YEAR

Answer 1

我建议使用预先加载，在模型中声明关系

https://laravel.com/docs/5.5/eloquent-relationships#eager-loading，所以你可以避免使用连接..

你试过了吗？

$data['faculty'] = Faculty::select('faculties.id', 'faculties.faculty', 'faculties.slug', 'faculties.status','s.semester','fs.faculty_id')
->join('faculty_semester as fs', 'faculties.id', '=', 'fs.faculty_id')
->join('semesters as s', 's.id', '=', 'fs.semester_id')
->groupBy('faculties.faculty')
->get();