Mysql 回答和问题数据库的Laravel自定义查询

我有三张桌子，叫做考试、问题和答案。他们是通过外国id连接的。我有一个连接问答表的功能。我有一个问题和多个答案。当我加入时，我看到许多相同的问题，只有一个答案（这是正常的）。有没有办法通过查询生成器在一个查询（数组）中加入1个问题和多个答案

考试表

        $table->id();

        $table->string('language_code');
        $table->string('title');
        $table->integer('subcategory_id')->nullable();
        $table->string('section');
        $table->string('class');
        $table->string('subject')->nullable();
        $table->string('time')->default('60');

        $table->timestamps();

问题表

        $table->id();

        $table->integer('exam_id');
        $table->string('q_pic')->nullable();
        $table->string('q_name')->nullable();
        $table->string('q_text');

        $table->timestamps();

答案表

        $table->id();

        $table->integer('user_id');
        $table->integer('question_id');
        $table->text('user_answer')->nullable();
        $table->integer('user_answer_id');
        $table->integer('c_answer_id'); 

        $table->timestamps();

这是我的视图函数

public function view($id)
{
    $questions = DB::table('questions')
        ->leftJoin('answers','answers.question_id','=','questions.id')
        ->where('questions.exam_id','=',$id)
        ->get();

    return view('main/view',compact('questions'));
}

---

如果正确设置了关系，则不需要连接即可实现此目的

你的关系应该是这样的：

//use App\Question;
$questionsWithAnswers = Question::where('id', $id)->with('answers')->get();

考试模式：

public function questions()
{
  return $this->hasMany(Question::class);
}

public function exam()
{
  return $this->belongsTo(Exam::class);
}

public function answers()
{
  return $this->hasMany(Answer::class);
}

public function question()
{
  return $this->belongsTo(Question::class);
}

问题模型：

public function questions()
{
  return $this->hasMany(Question::class);
}

public function exam()
{
  return $this->belongsTo(Exam::class);
}

public function answers()
{
  return $this->hasMany(Answer::class);
}

public function question()
{
  return $this->belongsTo(Question::class);
}

应答模式：

public function questions()
{
  return $this->hasMany(Question::class);
}

public function exam()
{
  return $this->belongsTo(Exam::class);
}

public function answers()
{
  return $this->hasMany(Answer::class);
}

public function question()
{
  return $this->belongsTo(Question::class);
}

现在您可以这样查询：

//use App\Question;
$questionsWithAnswers = Question::where('id', $id)->with('answers')->get();

---

这将为您提供一系列问题和相关答案。

如果您正确设置了关系，则无需加入即可实现此目的

你的关系应该是这样的：

//use App\Question;
$questionsWithAnswers = Question::where('id', $id)->with('answers')->get();

考试模式：

public function questions()
{
  return $this->hasMany(Question::class);
}

public function exam()
{
  return $this->belongsTo(Exam::class);
}

public function answers()
{
  return $this->hasMany(Answer::class);
}

public function question()
{
  return $this->belongsTo(Question::class);
}

问题模型：

public function questions()
{
  return $this->hasMany(Question::class);
}

public function exam()
{
  return $this->belongsTo(Exam::class);
}

public function answers()
{
  return $this->hasMany(Answer::class);
}

public function question()
{
  return $this->belongsTo(Question::class);
}

应答模式：

public function questions()
{
  return $this->hasMany(Question::class);
}

public function exam()
{
  return $this->belongsTo(Exam::class);
}

public function answers()
{
  return $this->hasMany(Answer::class);
}

public function question()
{
  return $this->belongsTo(Question::class);
}

现在您可以这样查询：

//use App\Question;
$questionsWithAnswers = Question::where('id', $id)->with('answers')->get();

这将为您提供一系列问题和相关答案