Laravel 模型嵌套查询

Question

我试图编写一个查询来从数据库中获取完整的用户饮食。问题是我无法从 diet_food table 获取数据。这是我的 tables:

diet_settings（id，total_days，等等）。用户饮食基本信息
eating_types（id，diet_id，eating_time，等等）。早餐、午餐等信息
diet_food（id、eating_type_id、产品等）。与每种饮食类型相关的食物。

这是我在控制器中使用的查询 class:

$diet = Diet::with("eatingType.dietFood")->get()->find($id)->toArray();

所以当我使用 var_dump() 时，它是这样的：

array (size=7)
'id' => int 2
'user_id' => int 1
'total_days' => int 1
'total_eating' => int 6
'notes' => string '' (length=0)
'created' => string '2016-09-01' (length=10)
'eating_type' => 
    array (size=3)
      0 => 
         array (size=6)
           'id' => int 7
           'diet_id' => int 2
           'eating_time' => string '8:00' (length=4)
           'eating_type' => string 'Breakfast' (length=10)
           'recommended_rate' => int 0
           'diet_food' => 
               array (size=0)
                   ...
      1 => 
        array (size=6)
          'id' => int 8
          'diet_id' => int 2
          'eating_time' => string '12:00' (length=5)
          'eating_type' => string 'Lunch' (length=14)
          'recommended_rate' => int 0
          'diet_food' => 
              array (size=0)
                 ...

在数组中，diet_food 是空的，即使我在数据库中存储了数据。

饮食模型

class Diet extends Model
{
    public $table = "diet_settings";
    public $timestamps = false;

    public function eatingType(){
        return $this->hasMany(EatingType::class);
    }
}

饮食类型模型

class EatingType extends Model
{
    public $timestamps = false;
    public $table = "eating_types";

    public function dietFood(){
        return $this->hasMany(DietFood::class, 'id','eating_type_id');
    }
    public function diet(){
        return $this->belongsTo(Diet::class);
    }
}

减肥食品模型

class DietFood extends Model
{
    public $timestamps = false;
    public $table = "diet_food";

    public function eatingType(){
        return $this->belongsTo(EatingType::class);
    }
}

Answer 1

按照本指南解决了枢轴问题：http://laraveldaily.com/pivot-tables-and-many-to-many-relationships/

此外，当您输出数据时，应该这样做：

$diets = Diet::with('eating')->get();
foreach($diets as $diet){
    var_dump($diet->eating->toArray());
}

Laravel 模型嵌套查询

Laravel Model nested query

relationship

eloquent

laravel-5

饮食模型

饮食类型模型

减肥食品模型