Laravel 数据透视表与其他表的结果

Question

我对关系数据透视表和结果感到困惑。 例如 ： 我有 3 个表 + 1 个用于插入数据的表

structurals
    id
    name

indicators
    id
    name

structural_indicator (Pivot Table)
    id
    structural_id
    indicator_id

quality_indicators (Insert Table)
    id
    structural_indicator_id
    numerator_score
    denominator_score
    date_at

这是我的关系：

    //Indicator Model
    public function structurals() {
        return $this->belongsToMany(Structural::class, 'structural_indicator');
    }

    //Structural Model
    public function Indicators() {
        return $this->belongsToMany(Indicator::class, 'structural_indicator')
                ->withPivot(['id']);
    }

对于与数据透视表的关系，没问题。

但我想要一个带有插入表 (quality_indicators) 的关系数据透视表，按 structural_id 和 date_at 搜索，并显示带有 quality_indicators 的结果数据透视表。

Answer 1

你需要创建StructuralIndicatorPivotModel如下

<?php

namespace yournamespace;

use Illuminate\Database\Eloquent\Model;

class StructuralIndicatorPivotModel extends Model
{
    /**
     *
     */
    protected $table = 'structural_indicator';

    /**
     *
     */
    protected $with = ['qualityIndicator'];

    /**
     *
     */
    public function qualityIndicator()
    {
        return $this->hasOne(QualityIndicator::class, 'structural_indicator_id', 'id');
    }
}

然后您需要在Indicator 和Structural 模型中添加与数据透视表的关系 指标模型

<?php

namespace yournamespace;

use Illuminate\Database\Eloquent\Model;

class Indicator extends Model
{
    /**
     *
     */
    public function structurals() {
        return $this->belongsToMany(Structural::class, 'structural_indicator');
    }

    /**
     *
     */
    public function structuralIndicatorPivot() {
        return $this->hasMany(StructuralIndicatorPivotModel::class, 'indicator_id');
    }
}

结构模型

<?php

namespace yournamespace;

use Illuminate\Database\Eloquent\Model;

class Structural extends Model
{
    /**
     *
     */
   public function indicators() {
    return $this->belongsToMany(Indicator::class, 'structural_indicator');
}

    /**
     *
     */
    public function structuralIndicatorPivot() {
        return $this->hasMany(StructuralIndicatorPivotModel::class, 'structural_id');
    }
}

所以现在您可以将查询编写为Structural::where('id', 'someId')->with('structuralIndicatorPivot')->get() 或Indicator::where('id', 'someId')->with('structuralIndicatorPivot')->get() 和quality_indicators 数据将自动加载，因为它与$with 的StructuralIndicatorPivotModel 相关联。

Answer 2

我正在尝试使用此依赖项 https://github.com/staudenmeir/eloquent-has-many-deep

但错误：

调用模型 [App\Models\Indicator] 上的未定义关系 [pivot]。

这是我的模型和支点

class Structural extends Model
{

    public function indicators()
    {
        return $this->belongsToMany(Indicator::class, 'structural_indicator')
                    ->withPivot(['id'])
                    ->using(StructuralIndicator::class);
    }

    public function qualityIndicator(){
        return $this->hasManyDeep(Indicator::class,
            [StructuralIndicator::class, QualityIndicator::class],
            ['structural_id', 'structural_indicator_id'],
            ['id', 'id']
        );
    }
}

class Indicator extends Model
{
    public function structurals()
    {
        return $this->belongsToMany(Structural::class, 'structural_indicator')->using(StructuralIndicator::class);
    }
}

class StructuralIndicator extends Pivot
{
    public function structural(){
        return $this->belongsTo(Structural::class);
    }
    
    public function indicator(){
        return $this->belongsTo(Indicator::class);
    }

    public function qualityIndicator()
    {
        return $this->hasMany(QualityIndicator::class, 'structural_indicator_id');
    }
}

class QualityIndicator extends Model
{
    public function structuralIndicator()
    {
        return $this->belongsToMany(StructuralIndicator::class, 'structural_indicator_id');
    }
}

这是我在控制器中的代码：

$structural = Structural::with('indicators')->with('indicators.pivot.qualityIndicator')->where('id', 6)->first();