Question

我有以下使用Laravel 5.3的模型：

提供者：

// Provider model

$primaryKey = 'id'

public function activities()
{
    return $this->hasMany(Activity::class);
}

活动：

// Activity model

$primaryKey = 'id'

public function provider()
{
    return $this-belongsTo(Provider::class);
}

public function semesters()
{
    return $this->hasMany(Semester::class);
}

public function semesterPurchases()
{
    return $this->hasManyThrough(Purchase::class, Semester::class, 'activity_id', 'purchasable_id')
        ->where('purchasable_type', Semester::class);
}

学期：

// Semester model

$primaryKey = 'id'

public function activity()
{
    return $this->belongsTo(\App\Models\Activity::class, 'activity_id', 'id');
}

购买：

// Purchase model

$primaryKey = 'id'

public function purchasable()
{
    return $this->morphTo();
}

在我的情况下，Semester::class是purchasable_type。是否可以在Provider::class和Purchase::class之间建立关系？为了使做这样的事情成为可能：

$providers = Provider::select('id', 'name', 'address')
  ->with('purchases')
  ->where('providers.id', 1)
  ->get();

我宁愿不参加这样的活动：

$providers = Provider::select('id', 'name', 'address')
  ->with('activities.purchases')
  ->where('providers.id', 1)
  ->get();

我知道我可以在hasManyThrough上使用Activity::class

Answer 1

Laravel不支持直接关系。

我已经为以下情况创建了一个程序包：https://github.com/staudenmeir/eloquent-has-many-deep

class Provider extends Model
{
    use \Staudenmeir\EloquentHasManyDeep\HasRelationships;

    public function purchases()
    {
        return $this->hasManyDeep(
            Purchase::class,
            [Activity::class, Semester::class],
            [null, null, ['purchasable_type', 'purchasable_id']]
        );
    }
}

Provider::find($id)->purchases;

通过多态性的Laravel复杂关系

1 个答案: