从链接 table（多对多）中检索数据。 Laravel

Question

我正在尝试从我的链接 table sfees 获取数据，它由 student_id 来自学生 table 和 mfee_id 来自 M_fees table。我的模型是：

Student:
class student extends Model
{
    //
    protected $fillable = ['first_name','middle_name','last_name','address','contact','dob','grade_id','status','scholorship','admission_year','passout_year'];

    public function grade() {
    return $this->belongsTo(Grade::class);
  }

  public function M_Fees() {
    return $this->belongsToMany('App\M_Fees');
  }
}

M_fees:

class M_fees extends Model
{
     protected $fillable = ['fee_type','amount'];

     public function Student()
{
     return $this->belongsToMany('App\Student');
}
}

我的 table sfees 结构如下：

现在，我如何检索特定学生的 M_fees 'fee_type 和数量）？我在我的控制器中使用了以下内容：

$student=Student::all()->whereLoose('id',$sid);
foreach ($student->M_fees as $M_fees) {
    echo $M_fees->pivot->fee_type;
}

但是好像没有效果。

谁能帮帮我？

Answer 1

兄弟试试this.Sometimes你需要定义枢轴tablename.Hope会help.Let我知道plz。

学生：

class student extends Model
{
    protected $table = "table_name";
    protected $fillable = ['first_name','middle_name','last_name','address','contact','dob','grade_id','status','scholorship','admission_year','passout_year'];

    public function grade() {
    return $this->belongsTo(Grade::class);
  }

  public function M_Fees() {
    return $this->belongsToMany('App\M_Fees','sfees');
  }
}

M_fees

class M_fees extends Model
{
     protected $table = "table_name";
     protected $fillable = ['fee_type','amount'];

     public function Student()
{
     return $this->belongsToMany('App\Student','sfees');
}
}

兄弟，我认为你的循环有一个 problem.You 必须循环遍历学生并且对于每个学生你都必须收取费用，amount.try 这个。

foreach ($student as $single_student) {

foreach ($single_student->M_fees as $M_fees) {

    echo $M_fees->pivot->fee_type;
}
}

希望它会work.let我知道

从链接 table（多对多）中检索数据。 Laravel

Retrieving data from linking table (Many to Many). Laravel

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laravel-5.2