Laravel:将分页添加到Json响应中

Question

我有一个数组，用于相互显示用户的联系人列表。

我想为json响应add ->paginate(10)功能，但我找不到必须放在哪里。

我的索引函数：

public function index()
{
$contacts = [];
$user = request()->user();
// Loop through the contacts and format each one
Contact::for($user->id)->get()->each(function ($contact) use ($user, &$contacts) {
$friend = $contact->user1_id === $user->id ? $contact->user2 : $contact->user1;
$contacts[] = $friend->toArray() + ['room' => $contact->room->toArray()];
});
return response()->json($contacts);
}

Answer 1

您可以为联系人创建集合并使用LenfthAwarePaginator

class ContactResourceCollection extends ResourceCollection
{
/**
* Transform the resource into an array.
*
* @param  IlluminateHttpRequest
* @return array
*/
public function toArray($request)
{
$response = [
'data' => $this->collection,
];
if($this->resource instanceof LengthAwarePaginator)
{
$response['pagination'] = [
'total' => $this->resource->total(),
'lastPage' => $this->resource->lastPage(),
'perPage' => $this->resource->perPage(),
'currentPage' => $this->resource->currentPage(),
'nextPageUrl' => $this->resource->nextPageUrl(),
'previousPageUrl' => $this->resource->previousPageUrl(),
];
}
return $response;
}
}

在控制器方法中添加以下行：

return new UserResourceCollection($users);

Answer 2

这是的总代码

$contacts = Contact::where('user_id', $user->id)->paginate(12);
if($contacts->count()){                    
$pageIndex = array();
$lastPage = $contacts->lastPage();
$user = request()->user();
for($i= 2; $i<=$lastPage; $i++){
array_push($pageIndex, $i);
}
return response()->json([
'contacts' => $contacts->map(function ($contact) use ($user) {
if($contact->user1_id  === $user->id){
return [
'friend' => $contact->user2,
'room' => $contact->room,
];
} else {
return [
'friend' => $contact->user1,
'room' => $contact->room,
]; 
}
})->toArray(),  
'per_page' => $contacts->perPage(),
'on_first_page' => $contacts->onFirstPage(),
'last_page' => $contacts->lastPage(),
'first_page_url' => $contacts->url(1),
'next_page_url' => $contacts->nextPageUrl(),
'prev_page_url' => $contacts->previousPageUrl(),
'last_page_url' => $contacts->url($contacts->lastPage()),
'total' => $contacts->total(),
'pageIndexArray' => $pageIndex,
'errors' => false,
]);
} else {
// Do Nothing
}

呼叫获取'URL?page='+Page_index to get the response in JS (AJAX)

Answer 3

我不确定，但尝试：将get()替换为paginate(10)

Contact::for($user->id)->paginate(10)->each(function ($contact) use ($user, &$contacts) {
$friend = $contact->user1_id === $user->id ? $contact->user2 : $contact->user1;
$contacts[] = $friend->toArray() + ['room' => $contact->room->toArray()];
});

Answer 4

您能将查询更改为：吗

$contacts = Contact::for($user->id)->paginate(10);

然后在该查询之后，您可以将for loop用于$contact；

foreach ($contacts as $key => $contact)
{
$friend = $contact->user1_id === $user->id ? $contact->user2 : $contact->user1;
$contacts[] = $friend->toArray() + ['room' => $contact->room->toArray()];
}

进入循环之前先寻呼。