访问具有一对多关系的子属性

Question

我有模型 Member、Loan 和 Interestamount。 Loan 与 Interestamount 有 hasMany 关系。我似乎无法从 Interestamount.

访问数据

我可以在 blade 中显示贷款 id 和 Interestamount，但无法为给定的 Loan 排序 Interestamount。

LoanController.php

public function loanInterest($criteria){
    //$loanData = Loan::all();
    $loanData =Loan::findOrFail($criteria);
    return view($this->_pagePath.'loan.loaninterest',compact('loanData'));
}

web.php

Route::any('loaninterest/{criteria?}','LoanController@loanInterest')
    ->name('loaninterest');

Loan.php

use Illuminate\Database\Eloquent\Model;
class Loan extends Model
{
    protected $fillable = [
        'amount',
        'interest',
        'status',
        'duration',
        'member_id',
        'loan_type_id',
        'interest_type_id',
        'loan_payment_type_id'
    ];

    // protected $appends = 'interest_amount

    public function getInterestAmountAttribute()
    {
        return ($this->amount)/100 * $this->interest;
    }

    public function interestamount()
    {
        return $this->hasMany(InterestAmount::class,'loan_id','id');
    }
}

InterestAmount.php

use Illuminate\Database\Eloquent\Model;
class InterestAmount extends Model
{
    protected $fillable = ['interestamount'];

    public function loan()
    {
        return $this->belongsTo(Loan::class,'loan_id','id');
    }
}

loaninterest.blade.php

<tr>
    <td>{{$loanData->member->name}}</td>
    @foreach($loanData->interestamount() as $int)
        <td>{{$int->interestamount}} </td>
    @endforeach     
</tr>

loan.blade.php

<a href="{{route('loaninterest', $loan->id) }}">Interest detail</a>

Answer 1

将您的贷款利息更改为此

<td>{{$loanData->member->name}}</td>
  @foreach($loanData->interestamount as $int)
   <td>{{$int->interestamount}} </td>
  @endforeach     
</tr>

当我们使用 $loanData->interestamount() 时，它指的是一个查询构建器，但是当我们使用 $loanData->interestamount 时，它 returns 与 $loanData->interestamount()->get()

相同的相关集合

Answer 2

$loanData->interestamount() returns 查询生成器实例而不是查询结果。

有几种方法可以从关系函数中获取结果。

其中之一是调用get()函数

例子

$loanData->interestamount()->get();

另一种方法是调用关系函数not as a function but as a property

例子

$loanData->interestamount;

因此在您的 blade 文件中 @foreach()

@foreach($loanData->interestamount as $int)
    <td>{{$int->interestamount}} </td>
@endforeach

Answer 3

我不知道原因，但我这样做了并且成功了。

  <td>{{$loanData->member->name}}</td>
  @foreach($loanData->interestamount()->get() as $int)
 <td>{{$int->interestamount}} </td>
  @endforeach

访问具有一对多关系的子属性

accessing child attribute with one to many relationship

has-many

laravel

eloquent