laravel 9.0 Eloquent all() 方法没有 return 关系

Question

我有两个表 Department 和 InspectionSite。

部门迁移

public function up()
    {
        Schema::create('departments', function (Blueprint $table) {
            $table->id();
            $table->string('department_name', 100);
        });
    }

InspectionSite 迁移：

public function up()
    {
        Schema::create('inspection_sites', function (Blueprint $table) {
            $table->id();
            $table->string('site_title');
            $table->foreignIdFor(\App\Models\Department::class);
            $table->timestamps();
        });
    }

部门模型：


class Department extends Model
{
    use HasFactory;
  
    protected $fillable = ['depatment_name'];

    public function sites() {
        return $this->hasMany(InspectionSite::class);
    }

}

InspectionSite 模型

class InspectionSite extends Model
{
    use HasFactory;
    protected $guarded = [];

    public function department() {
        return $this->belongsTo(Department::class, 'department_id');
    }
}

正在从控制器获取数据

 public function get() {
        $selector = ['site_title AS title', 'site_type' ];
        $sites = InspectionSite::all();
        return response()->json($sites->department, 200);
    }

当我调用 find() 方法时它 returns 关系数据但不在 all() 方法中？

public function get() {
    $departments = Department::all();
    return response()->json($departments->sites, 200);
}

Error details

Answer 1

all() 方法 returns Collection 个模型，每个模型应该有 department 关系。

当您尝试 return 时：

return response()->json($sites->department, 200);

您正在 Collection 实例上访问 department 属性。相反，您应该在该集合的每个模型上调用它。

在这里您可以尝试解决方案，具体取决于您想要实现的目标

解决方案一：（推荐）

$sites = InspectionSite::with('department')->get();
return response()->json($sites, 200);
// result
[
  {
    ...
    department: ...
  }
  ...
]

解决方案 2：（Returns 只有部门，没有 InspectionSite 属性）

$sites = InspectionSite::with('department')->get()
->map(function($s) { 
   return $s->department;
});
return response()->json($sites, 200);
// result
[
  {
    [department]
  }
  {
    [department]
  }
]

laravel 9.0 Eloquent all() 方法没有 return 关系

laravel 9.0 Eloquent all() method doesn't return relationship

php

laravel