Django Rest Framework + Datatables + Class Based Views + Server Side Processing - django

Question

How to use Django Rest Framework + Datatables + Class Based Views?

Answer 1

This is a python snipped to use Django Rest Framework + Datatables + Class Based Views.
import re
from rest_framework.generics import GenericAPIView
from rest_framework.pagination import LimitOffsetPagination
from rest_framework.response import Response
class DataTablePagination(LimitOffsetPagination): # pragma: no cover
"""Custom pagination class for datatable server side processing."""
limit_query_param = "length"
offset_query_param = "start"
def get_paginated_response(self, data):
"""See datatables server side processing."""
return Response({
"recordsTotal": self.count,
"recordsFiltered": self.count,
"data": data,
"draw": int(self.request.GET["draw"])
})
#staticmethod
def get_datatable_ordering(request):
"""Parse datatables conf parameters."""
ordering = []
columns = dict()
for key in request.GET:
if key.startswith('columns'):
col = dict()
keys = [i[1:-1] for i in re.findall(r'\[\w+\]', key)]
for i in range(len(keys) - 1):
if i == 0:
if keys[i] not in columns: columns[keys[i]] = dict()
col = columns[keys[i]]
else:
if keys[i] not in col: col[keys[i]] = dict()
col = col[keys[i]]
col[keys[-1]] = request.GET[key]
if 'order[0][column]' in request.GET:
ret = columns[request.GET['order[0][column]']]['data']
if request.GET['order[0][dir]'] != 'asc': ret = '-' + ret
ordering.append(ret.replace('.', '__'))
return ordering
class DatatablesView(GenericAPIView): # pragma: no cover
"""Base view with datatables server side integration."""
ordering = ("id",)
def initialize_request(self, request, *args, **kwargs):
"""Enable server side processing for datatables and `q` searching."""
request.GET = request.GET.copy()
if 'draw' in request.GET:
self.pagination_class = DataTablePagination
self.ordering = self.pagination_class.get_datatable_ordering(
request) or self.ordering
if 'length' in request.GET and str(request.GET['length']) == '-1':
request.GET['length'] = 1e9
if 'search[value]' in request.GET:
request.GET['search'] = request.GET['search[value]']
elif 'q' in request.GET and 'search' not in request.GET:
request.GET['search'] = request.GET['q']
return super().initialize_request(request, *args, **kwargs)