如何使用 Laravel rest api 在 vue-tables-2 上添加分页？

Question

我应该怎么做才能从 Laravel 端点对 Vue 服务器表启用分页？

我的组件：

<template>
    <div>
        <v-server-table :columns="columns" url="/object/find" :options="options">
        </v-server-table>
    </div>
</template>
<script>
export default {
data () {
      return {
        columns: ['name', 'type', 'created_by', 'created_at'],
        options: {
          perPage: 5,
          perPageValues: [5, 10, 15, 25, 50, 100],
          pagination: {chunk: 5},
          dateColumns: ['created_at'],
          dateFormat: 'DD-MM-YYYY HH:mm',
          datepickerOptions: {
            showDropdowns: true,
            autoUpdateInput: true,
          }
          filterable: ['name', 'type','created_by', 'created_at'],
          sortable: ['name', 'type', 'created_by', 'created_at'],
          requestAdapter (data) {
            return {
              sort: data.orderBy ? data.orderBy : 'name',
              direction: data.ascending ? 'asc' : 'desc',
              limit: data.limit ? data.limit : 5,
              page: data.page,
              name: data.query.name,
              created_by: data.query.created_by,
              type: data.query.type,
              created_at: data.query.created_at
            }
          },
          responseAdapter ({data}) {
            return {
              data,
              count: data.length
            }
          },
        }
      }
    },
 }
</script>

控制器：

public function findObjects(Request $request)
    {
        $objects = Objects::withTrashed();
        $sort = $request->get('sort');
        $direction = $request->get('direction');
        $name = $request->get('name');
        $created_by = $request->get('created_by');
        $type = $request->get('type');
        $limit = (int)$request->get('limit');
        $page = (int)$request->get('page');
        $created_at = $request->get('created_at');
        if ($sort !== null && $direction !== null) {
            $objects->orderBy($sort, $direction);
        }
        if ($name !== null) {
            $objects->where('name', 'like', '%' . $name . '%');
        }
        if ($created_by !== null) {
            $objects->where('created_by', 'like', '%' . $created_by . '%');
        }
        if ($type !== null) {
            $objects->where('type', 'like', '%' . $type . '%');
        }
        if ($created_at !== null) {
            $date_range = json_decode($created_at);
            $objects->whereBetween('created_at', [Carbon::parse($date_range->start), Carbon::parse($date_range->end)]);
        }

         return $objects->get();
    }

所有过滤器都可以正常工作。当我使用 LIMIT 或 TAKE 或 PAGINATE 时，它将返回 5 个项目，并且分页链接在组件中不起作用。 我应该在我的控制器和组件中做什么以在页面上显示例如 5 个项目？

Answer 1

请仔细阅读文档here

您需要返回一个带有两个属性的 JSON 对象：

data : array - 具有相同键的行对象数组。

count: number - 限制前的总数。

例如，您的 JSON 应如下所示：

[ 
    "data": [
       { 
          "name": "Name1", 
          "created_at": "01-01-2019 00:00:01, 
          "updated_at": "02-01-2019 10:12:13",
          "pushed_at" : "01-01-2019 00:00:05"
       },
       { 
          "name": "Name2", 
          "created_at": "01-01-2019 00:00:01, 
          "updated_at": "02-01-2019 10:12:13",
          "pushed_at" : "01-01-2019 00:00:05"
       }, 
       { 
          "name": "Name3", 
          "created_at": "01-01-2019 00:00:01, 
          "updated_at": "02-01-2019 10:12:13",
          "pushed_at" : "01-01-2019 00:00:05"
       }
    ],
    "count":100
]

在您的控制器中，您不会返回 vue-table-2 分页的总行数。在您的回复中添加计数将解决您的问题

使用以下代码更改您的控制器代码：

public function findObjects(Request $request)
{
    $objects    = Objects::withTrashed();
    $sort       = $request->get('sort');
    $direction  = $request->get('direction');
    $name       = $request->get('name');
    $created_by = $request->get('created_by');
    $type       = $request->get('type');
    $limit      = (int)$request->get('limit');
    $page       = (int)$request->get('page');
    $created_at = $request->get('created_at');
    if ($sort !== null && $direction !== null) {
        $objects->orderBy($sort, $direction);
    }
    if ($name !== null) {
        $objects->where('name', 'like', '%' . $name . '%');
    }
    if ($created_by !== null) {
        $objects->where('created_by', 'like', '%' . $created_by . '%');
    }
    if ($type !== null) {
        $objects->where('type', 'like', '%' . $type . '%');
    }
    if ($created_at !== null) {
        $date_range = json_decode($created_at);
        $objects->whereBetween('created_at', [Carbon::parse($date_range->start), Carbon::parse($date_range->end)]);
    }

    $count = $objects->count();

    $objects->offset($limit * ($page - 1))->limit($limit);

    $data = $objects->get()->toArray();

    return response()->json([
        'data'  => $data,
        'count' => $count
    ]);
}

并像这样更改您的 vuejs 代码

<template>
<div>
    <v-server-table :columns="columns" url="/object/find" :options="options">
    </v-server-table>
</div>
</template>
<script>
export default {
data () {
      return {
        columns: ['name', 'type', 'created_by', 'created_at'],
        options: {
          perPage: 5,
          perPageValues: [5, 10, 15, 25, 50, 100],
          pagination: {chunk: 5},
          dateColumns: ['created_at'],
          dateFormat: 'DD-MM-YYYY HH:mm',
          datepickerOptions: {
            showDropdowns: true,
            autoUpdateInput: true,
          }
          filterable: ['name', 'type','created_by', 'created_at'],
          sortable: ['name', 'type', 'created_by', 'created_at'],
          requestAdapter (data) {
            return {
              sort: data.orderBy ? data.orderBy : 'name',
              direction: data.ascending ? 'asc' : 'desc',
              limit: data.limit ? data.limit : 5,
              page: data.page,
              name: data.query.name,
              created_by: data.query.created_by,
              type: data.query.type,
              created_at: data.query.created_at
            }
          }
        }
      }
    },
 }
</script>

Answer 2

为了启用分页，您需要在 SQL 语句中完成。如果您使用 SQL Server，请使用 OFFSET/FETCH。如果您使用 MYSQL，请使用 LIMIT/OFFSET。使用此链接作为参考：

What is the best way to paginate results in SQL Server