问Laravel更新模型的一对多关系项目

EN

class User extends Model
{
    public function items()
    {
        return $this->hasMany(Item::class, "userId");
    }
}

class Item extends Model
{
    public function user()
    {
        return $this->belongsTo(User::class, "userId");
    }
}

{
    "userAttribute1": "Something",
    "userAttribute2": "Something else",
    "items": [
        {
            "name": "Name1"
        },
        {
            "name": "Name2"
        }
    ]
}

// Controller method for PUT /users/<id>
public function update(User $user, Request $request)
{
    // Update user attributes normal way
    $user->fill($request->validated());
    $user->save();
    
    // Array, e.g. [ { "name": "Name1" }, { "name": "Name2" } ]
    $newItems = $request->validated()["items"];
    
    // Collection of items
    $currentItems = $user->items;
    
    // Array to keep track of which items to delete later
    $removeItemIds = [];
    
    foreach ($currentItems as $i => $currentItem)
    {
        // currentItem is Item model

        $exists = false;
        
        foreach ($newItems as $j => $newItem)
        {
            // newItem is array, e.g. { "name": "Name1" }

            if ($currentItem->name === $newItem["name"])
            {
                $exists = true;
                break;
            }
        }
        
        if ($exists)
        {
            // New item already exists, remove from newItems array
            unset($newItems[$j]);
        }
        else
        {
            // Current item does't exist anymore, remove from currentItems collection and mark as deletable
            $removeItemIds[] = $currentItem->id;
            unset($currentItems[$i]);
        }
    }
    
    // Add remaining new items
    foreach ($newItems as $newItem)
    {
        $item = Item::make($newItem);
        $item->userId = $user->id;
        $item->save();
        
        $currentItems->push($item);
    }
    
    // Delete extra items
    $user->items()->whereIn("id", $removeItemIds)->delete();
    
    // Update relation so the returned data is up-to-date as well
    $user->setRelation("items", $currentItems);
    
    return [
        "user" => new UserResource($user),
    ];
}