我有一个模型CourseModule
,并且每个项目都与同一模型相关。
数据库结构:
模型中的关系:
public function parent()
{
return $this->belongsTo('App\CourseModule','parent_id')->where('parent_id',0);
}
public function children()
{
return $this->hasMany('App\CourseModule','parent_id');
}
我尝试了以下操作,但它仅返回单个关系级别。
Tried:
CourseModule::with('children')->get();
我正在尝试创建如下所示的 json 输出,
预期输出:
[
{
"id": "1",
"parent_id": "0",
"course_id": "2",
"name": "Parent",
"description": "first parent",
"order_id": "1",
"created_at": "-0001-11-30 00:00:00",
"updated_at": "-0001-11-30 00:00:00",
"children": [
{
"id": "2",
"parent_id": "1",
"course_id": "2",
"name": "Child 1",
"description": "child of parent",
"order_id": "2",
"created_at": "-0001-11-30 00:00:00",
"updated_at": "-0001-11-30 00:00:00",
"children": [
{
"id": "3",
"parent_id": "2",
"course_id": "2",
"name": "Child2",
"description": "child of child1",
"order_id": "2",
"created_at": "-0001-11-30 00:00:00",
"updated_at": "-0001-11-30 00:00:00",
"children": [
{
"id": "4",
"parent_id": "3",
"course_id": "2",
"name": "Child 3",
"description": "child of child 2",
"order_id": "2",
"created_at": "-0001-11-30 00:00:00",
"updated_at": "-0001-11-30 00:00:00",
"children": []
}
]
}
]
}
]
}
]
我不明白如何获取内部子对象。