python - 如何通过 django Rest 框架使用数据表服务器端处理

Question

我尝试使用datatables :服务器端处理

我有一个观点:

class DataList(generics.ListAPIView):
    queryset = Data.objects.all()
    serializer_class = DataSerializer
 

还有我的 html :

$(document).ready(function() {
   $('#example').dataTable( {

        "processing": true,   
        /* serverSide:true  */        
        "deferRender": true,           
        "iDisplayLength": 25,
        "paging": true,
        ajax: {
         url: 'http://127.0.0.1:8000/api/datas/',
         dataSrc: ''
        },
       columns: [
            { "data": "id"},
            { "data": "name"},
            { "data": "update_time"},
            { "data": "description"},
        ]
   });

});

这很好用。

然后我注释掉 serverSide:true :

$(document).ready(function() {
   $('#example').dataTable( {

        "processing": true,   
        "serverSide": true,        
        "deferRender": true,           
        "iDisplayLength": 25,
        "paging": true,
        ajax: {
         url: 'http://127.0.0.1:8000/api/datas/',
         dataSrc: ''
        },
       columns: [
            { "data": "id"},
            { "data": "name"},
            { "data": "update_time"},
            { "data": "description"},
        ]
   });

});

分页器、搜索和排序不再工作
看起来它查询了所有数据。

我看到数据表示例是使用 php 的。
我想将数据表与 django Rest 框架集成，我还应该设置什么？

Answer 1

首先，阅读一些有关数据表服务器端处理的文档:https://datatables.net/manual/server-side 。它会告诉您什么数据表发送到后端以及它想要返回什么。只需提供所需的参数即可。

那么让我向您展示我作品中的一些代码。这不是完整的示例，但您将知道将什么传递回 datatable() 函数。

一些常量:

import json


DEFAULT_START_POSITION = 0
DEFAULT_PAGE_SIZE = 10
DEFAULT_SORTING_COLUMN_INDEX = 1
DEFAULT_SORTING_METHOD = 'asc'

#constants for querying
ORDER_DICT = {
    0: 'field1',
    1: 'field2',
}

ORDER_BY = {
    'desc': '-',
    'asc': ''
}

QUERY_FIELDS = ['field1', 'field2']

Python代码主要部分:

def get_sorting(self, request_values):
    return int(request_values.get('iSortCol_0', self.DEFAULT_SORTING_COLUMN_INDEX)),\
           request_values.get('sSortDir_0', self.DEFAULT_SORTING_METHOD).lower()

def get_paging(self, request_values):
    return int(request_values.get('iDisplayStart', self.DEFAULT_START_POSITION)),\
               int(request_values.get('iDisplayLength', self.DEFAULT_PAGE_SIZE))

def render_records(self, current_page_members, query):
    # list to be returned for aaData
    records = []
    # ... do something to put data in the list and return
    return records

def get(self, request):
    # ... receive the request
    # paging
    start, page_size = self.get_paging(request_values)
    # sorting
    sort_column, sort_by = self.get_sorting(request_values)

    # research query
    query = request_values.get('sSearch', '')  # get search term from datatable request
    query_combined = self.get_combined_query(query)

    all_records, filter_count, current_page_records = \
        self.get_member_list(request_values, company_id, query_combined, sort_by, sort_column, start, page_size)

    # json dict to be returned
    records = {
        'iTotalRecords': all_records.count(),    # The total count of records in your database, if query exist, it is the count of filtered records
        'sEcho': request_values.get('sEcho', '0'),    # Represents the rendering count of datatable
        'aaData': [],    # Main data to be rendered in table
    }

    # if no query, all records returned
    records.update({'iTotalDisplayRecords': filter_count if query else records['iTotalRecords']})

    # update aaData list for records
    records['aaData'].extend(self.render_records(current_page_records, query))

    return HttpResponse(json.dumps(records), content_type='application/json')

请再次注意，这不是一个完整的示例，您应该将其扩展以满足您自己的要求。