英文:
Laravel querying polymorphic relationships with nested many to many items
问题
以下是您要翻译的内容：
我有4个表格，它们之间有以下关系：
class Note extends Model
{
public function noteable() {
return $this->morphTo();
}
}
class Expense extends Model
{
public function notes()
{
return $this->morphMany(Note::class, 'noteable');
}
}
class Review extends Model
{
public function notes()
{
return $this->morphMany(Note::class, 'noteable');
}
public function repairs()
{
return $this->belongsToMany(Repair::class);
}
}
class Repair extends Model
{
public function reviews()
{
return $this->belongsToMany(Review::class);
}
}
正如您所看到的，Note 是一对多多态关系，而 Reviews 与 Repairs 是多对多关系。
我想要获取所有与 Reviews 关联并且同时具有 Repairs 的 Notes。我该如何执行这样的操作？
根据文档，我尝试像这样做：
$notes = App\Note::query()
->with(['noteable' => function (MorphTo $morphTo) {
$morphTo->morphWith([
Review::class => ['repairs']
]);
}])->get();
我希望我的查询应该返回类似以下的结果：
[
{
"id": 11,
"noteable_id": 4,
"noteable_type": "App\\Expense",
"noteable": {
"id": 4,
"name": "Expense",
"category": "general"
}
},
{
"id": 13,
"noteable_id": 5,
"noteable_type": "App\\Review",
"noteable": {
"id": 5,
"name": "Review 5",
"mileage": 120000,
"repairs": [..., ...] // 我所需的内容
}
}
]
英文:
I have 4 tables with the following relationships:
class Note extends Model
{
public function noteable() {
return $this->morphTo();
}
}
class Expense extends Model
{
public function notes()
{
return $this->morphMany(Note::class, 'noteable');
}
}
class Review extends Model
{
public function notes()
{
return $this->morphMany(Note::class, 'noteable');
}
public function repairs()
{
return $this->belongsToMany(Repair::class);
}
}
class Repair extends Model
{
public function reviews()
{
return $this->belongsToMany(Review::class);
}
}
as you can see Note is in the relationship one to many polymorphic and Reviews is in many to many with Repairs.
I would like to take all Notes that Reviews also has Repairs. How do I do such an operation?
Following the documentation I am trying to do something like this:
$notes = App\Note::query()
->with(['noteable' => function (MorphTo $morphTo) {
$morphTo->morphWith([
Review::class => ['repairs']
]);
}])->get();
I would like to my query should return something like:
[
{
"id": 11,
"noteable_id": 4,
"noteable_type": "App\\Expense",
"noteable": {
"id": 4,
"name": "Expense",
"category": "general"
}
},
{
"id": 13,
"noteable_id": 5,
"noteable_type": "App\\Review",
"noteable": {
"id": 5,
"name": "Review 5",
"mileage": 120000,
"repairs": [..., ...] //what I need
}
}
]
答案1
得分: 1
To load your Repair models for your Reviews, try this:
如果要为您的“Review”加载“Repair”模型，请尝试以下操作：
if ($type == 'App\Review') {
$query->with('repairs')
}
EDIT:
我刚刚对“whereHasMorph”进行了更多的阅读，我认为我对它的作用有所误解。它在最基本的层面上是一个“where”子句，旨在限制查询的结果。我上面建议的相当于将某些内容连接到MySQL子查询，这不是我们想要的！
您实际上想要做的是：
嵌套预加载多态关系
（https://laravel.com/docs/6.x/eloquent-relationships#querying-polymorphic-relationships）
英文:
To load your Repair models for your Reviews, try this:
if ($type == 'App\Review') {
$query->with('repairs')
}
EDIT :
I've just done some more reading on whereHasMorph and I think i was mistaken as to what it is doing. It is at it's most basic level a where clause, designed to constrain the results of the query. What I have suggested above would the the equivalent of joining something to a MySQL subquery. Not what we want!
What you want to do is actually under
> Nested Eager Loading morphTo Relationships
(https://laravel.com/docs/6.x/eloquent-relationships#querying-polymorphic-relationships)
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