背景
用laravel好几年了, 这次写接口的时候, 突然发现分页数据返回的格式有点杂，而且作为一个api不需要返回这么多用不着的数据, 于是就想着看看能不能改下
{
    "code": 200,
    "data": {
        "current_page": 1,
        "data": [
            {
                "id": 1,
                "name": "技术部",
                "description": "",
                "qr_code_path": "http://mag.com/1.jpg",
                "created_at": "2020-06-24 16:12:43",
                "updated_at": "2020-06-24 16:12:44"
            }
        ],
        "first_page_url": "http://mag.com/department?page=1",
        "from": 1,
        "last_page": 1,
        "last_page_url": "http://mag.com/department?page=1",
        "next_page_url": null,
        "path": "http://mag.com/department",
        "per_page": 10,
        "prev_page_url": null,
        "to": 1,
        "total": 1
    },
    "message": "success"
}

解决
寻找发现

Illuminate\Database\Eloquent\Builder 文件



调用组装分页数据的地方
随即再跟进Illuminate\Database\Concerns\BuildsQueries


可以看到我用红色标出来是是返回的分页类, 用蓝色标出来是用容器加载的这个类
继续查找这个类Illuminate\Pagination\LengthAwarePaginator

发现组装分页数据的是这个类中toArray方法



刚刚上面也说这个分页类是通过容器加载的，那我们只要在容器内重新加载下这个类就行
于是我先自定义了一个分页类，继承了上面的分页类，并重写了toArray方法



然后在AppServiceProvider容器内重新绑定了这个分页类的实现

测试一下



完美解决
总结
主要还是用到了类的重写和容器,  没啥特别复杂的操作

			场景：我调用接口 传入分页大小等数据，接口返回总数的和列表


demo  
链接：http://www.jb51.net/article/94243.htm





    use Illuminate\Pagination\LengthAwarePaginator;
    use Illuminate\Pagination\Paginator;
    use Illuminate\Http\Request;
# 仅做演示 #
   public function userList(Request $request) {
        $users = [
            ['username'=>'zhangsan', 'age'=>26],
            ['username'=>'lisi', 'age'=>23],
            ['username'=>'wangwu', 'age'=>62],
            ['username'=>'zhaoliu', 'age'=>46],
            ['username'=>'wangmazi', 'age'=>25],
            ['username'=>'lanzi', 'age'=>24],
            ['username'=>'pangzi', 'age'=>21]
        ];
        $perPage = 3;
        if ($request->has('page')) {
            $current_page = $request->input('page');
            $current_page = $current_page <= 0 ? 1 :$current_page;
        } else {
            $current_page = 1;
        }
        $item = array_slice($users, ($current_page-1)*$perPage, $perPage); //注释1
        $total = count($users);
        $paginator =new LengthAwarePaginator($item, $total, $perPage, $currentPage, [
            'path' => Paginator::resolveCurrentPath(), //注释2
            'pageName' => 'page',
        ]);
        $userlist = $paginator->toArray()['data'];
        return view('userlist', compact('userlist', 'paginator'));
    }



本场景代码
public function index(Request $request){
    $paginator =new LengthAwarePaginator([], 100,5, 1, [
        'path' => Paginator::resolveCurrentPath(), //注释2
        'pageName' => 'page',
    ]);
    echo  $paginator->appends(['sort' => 'votes'])->render();
    exit;



							
		

laravel paginator接口使用分页/自定义分页
在使用laravel开发后端接口时，需要分页。但是paginate（）无法传递当前页面值，只能传一个展示条数；
之后发现这么写挺蠢的，拿到数据再做分页，有问题;

在使用laravel开发后端接口时，需要分页。但是paginate（）无法传递当前页面值，只能传一个展示条数；
查看paginator
Illuminate\Pagination;
class Paginator extends AbstractPaginator {}

可以看到继承AbstractPaginator
trait MyPage
{
    protected function page($data = [],$perPage = 10,$page = 1)
    {
        $offset = ($page * $perPage) - $perPage;
        $res = new LengthAwarePaginator(array_slice($data, $offset, $perPage, true), count($data), $perPage, $page);
        $res = $res->toArray();
        return [
            //使用array_values去掉索引数组key
            'data'=>array_values($res['data']),
            'total'=>$res['total']
        ];
    }
}

创建一个trait直接使用LengthAwarePaginator

可以传入
$perPage //展示条数
$page //页码

可以看到数据如下
array:2 [
  "data" => array:1 [
    0 => array:5 [
      "id" => 2
      "name" => "test"
    ]
  ]
  "total" => 2
]

此数据就可供前端使用了

在控制器中
class TestController extends Controller
{
    use MyPage;
    
    省略....
    public function index(Request $request){
    ...
    	$data = User::get()->toArray();
    	$res = $this->page($data,$perPage,$page);
    	...
    }

之后发现这么写挺蠢的，拿到数据再做分页，有问题;
所以更新
	use Illuminate\Database\Eloquent\Builder;
	//把分页应该放到查询里
    public function paginate(Builder $query, $page = 1, $perpage = 10, $load = ''){
        $skip = ($page - 1)*$perpage;
        $count = $query->count('*');
        $totalPage = $count == 0 ? 0 : (int)ceil($count / $perpage);
        if($load === ''){
            $list = $query->skip($skip)->take($perpage)->get()->toArray();
        }else{
            $list = $query->skip($skip)->take($perpage)->get()->load($load)->toArray();
        }
        return [
            'data'=>$list,
            'total'=>$count,
            'totalPage'=>$totalPage,
        ];
    }

控制器里的代码还是差不多
	public function list(Request $req){
		...
		$data = $this->paginate(User::select('*'),$req->page1,$req->perpage);
		...
	}

后台接口
namespace App\Http\Controllers;

use App\Show;
use Illuminate\Http\Request;

class ShowController extends Controller
{
    //
    public function index(Request $request){
    //判断是不是ajax 请求
        if (request()->ajax()) {
            $data = Show::paginate(5)->toArray();
            return $data;
        } else {
           $data = Show::paginate(5)->toArray();
           return view('show.index',compact('data'));
        }

    }
    public function del(Request $request){
      
    	$ids =$request->id;  //接过来传过来的id字符串
    	$data = explode(',', $ids);//字符串分割数组
    	Show::destroy($data);  //使用函数destroy 批量删除   注意数据库字段的 是 id   否则删除失败 
    	$data = Show::paginate(5);
        return $data;
    }

}

返回的数据


<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
       <link rel="stylesheet" href="http://apps.bdimg.com/libs/bootstrap/3.3.0/css/bootstrap.min.css">
       <script src="http://apps.bdimg.com/libs/jquery/2.1.1/jquery.min.js"></script>
       <script src="http://apps.bdimg.com/libs/bootstrap/3.3.0/js/bootstrap.min.js"></script>

    <title>Document</title>
</head>
<body  align="center">
 <table  align="center">
  <thead>
 	<tr>
 		<td></td>
 		<td>id</td>
 		<td>名称</td>
 		<td>数量</td>
 		<td>价格</td>
 	</tr>
  </thead>
  <tbody id='tbody'>
 	@foreach ($data['data'] as $v)

 	<tr>
 		<td><input type="checkbox" name="box" value="{{ $v['id'] }}"></td>
 		<td>{{ $v['id']}}</td>
 		<td>{{ $v['cart_name']}}</td>
 		<td>{{ $v['num']}}</td>
 		<td>{{ $v['price']}}</td>
 	</tr>
    @endforeach
     </tbody>
 </table>
 <div id="fen">
 <a path="{{$data['first_page_url']}}" class="page">首页</a>
 <a path="{{$data['prev_page_url']}}" class="page" >上一页</a>
 <a path="{{$data['next_page_url']}}" class="page" >下一页</a>
 <a path="{{$data['last_page_url']}}" class="page">尾页</a>
 </div>
 <br>
 <button id='pi'>批删</button>
</body>
</html>

<script type="text/javascript">
   $(document).on('click','.page',function(){
    var path = $(this).attr('path');
    console.log(path);
    $.get(path,function(res){
        console.log(res);
        str = "";
        arr = "";
        $.each(res.data,function(k,v){
          str += "<tr>";
          str += '<td><input type="checkbox" name="box" value=" ' + v.id + '"></td>';
          str += "<td>"+ v.id + "</td>";
          str += "<td>"+ v.cart_name + "</td>";
          str += "<td>"+ v.num + "</td>";
          str += "<td>"+ v.price + "</td>";
          str += "</tr>";
        })
        arr += '<a path="'+res.first_page_url+'" class="page">首页</a>';
        arr += '<a path="'+res.prev_page_url+'" class="page">上一页</a>';
        arr += '<a path="'+res.next_page_url+'" class="page">下一页</a>';
        arr += '<a path="'+res.last_page_url+'" class="page">尾页</a>';
        $('#tbody').html(str);
        $('#fen').html(arr);
    })




   })






	 $("#pi").on("click", function(){
    var ids ="";
	    $("[name=box]:checked").each(function() {
          ids += ',' + $(this).val();
       });
      ids = ids.substr(1);
      var url = "{{route('show.del') }}"
      $.get(url,{id:ids},function(res){
        console.log(res);
        str = "";
        $.each(res.data,function(k,v){
          str += "<tr>";
          str += '<td><input type="checkbox" name="box" value=" ' + v.id + '"></td>';
          str += "<td>"+ v.id + "</td>";
          str += "<td>"+ v.cart_name + "</td>";
          str += "<td>"+ v.num + "</td>";
          str += "<td>"+ v.price + "</td>";
          str += "</tr>";
        })
        $('#tbody').html(str);

      });
	  });






</script>