Laravel 链接范围查询

Question

我的数据库有两个范围查询。

我查询的数据是这样的：

   {
       year: "2015",
       term: "Summer",
       subject_code: "DIGM",
       course_no: "350",
       instr_type: "Lab",
       instr_method: "Face To Face",
       section: "003",
       crn: "42953",
       course_title: "Digital Storytelling",
       credits: "3.0",
       day: "R",
       time: "06:30 pm - 09:20 pm",
       instructor: "Teacher Name",
       campus: "University Building",
       max_enroll: "18",
       enroll: "18",
       building: "PLACE",
       room: null,
       description: "By surfing the internet and playing computer games, by lectures, assigned readings, class screening, and research projects, this class explores the impact of digital media on art, design and daily living. This is a writing intensive course. ",
       pre_reqs: "",
       co_reqs: ""
   }

search 只是根据用户输入查找项目，例如课程名称或其讲师

/**
 * Search for course title or subject name
 * @param $query
 * @param $searchTerm Course Title or Subject Name i.e. "ECEC 355" or
 *                    "Digital Logic"
 * @return mixed
 */
public function scopeSearch($query, $searchTerm) {
    return $query
        ->where('course_title', 'like', '%' . $searchTerm . '%')
        ->orWhere(DB::raw("subject_code || ' ' ||  course_no"),
            'like',
            '%' . $searchTerm . '%'
        )
        ->orWhere('instructor', 'like', '%' . $searchTerm . '%')
        ;
}

以下范围仅查询returns讲义。我试过这样的查询：$class->lectures()->get() 并且有效 - 它提取了所有讲座。

public function scopeLectures($query) {
    return $query
        ->where('instr_type', 'like', LECTURE) // where LECTURE is a constant
        ;
}

但是，如果我将范围查询链接在一起：

$class::search('digm 350')->lecture()->get();

我会得到 search 而不是 search->lab 的所有结果。

不太清楚为什么。

Answer 1

原因是您在搜索中执行的 OR。当您应用两个范围时，生成的查询是：

where `course_title` like ? or subject_code || ' ' ||  course_no like ? or `instructor` like ? and `instr_type` like ?

而你需要的是

where (`course_title` like ? or subject_code || ' ' ||  course_no like ? or `instructor` like ? and `instr_type` like ?)

请注意，第一个范围的约束已放在括号中。

您需要更改在 search 范围内应用约束的方式：

public function scopeSearch($query, $searchTerm) {
  return $query->where(function($query) use ($searchTerm) {
    $query
      ->where('course_title', 'like', '%' . $searchTerm . '%')
      ->orWhere(DB::raw("subject_code || ' ' ||  course_no"), 'like', '%' . $searchTerm . '%')
      ->orWhere('instructor', 'like', '%' . $searchTerm . '%');
 });

}

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