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# -*- coding: utf-8 -*-
#
import coreapi
from rest_framework import filters
from rest_framework.fields import DateTimeField
from rest_framework.serializers import ValidationError
from django.core.cache import cache
import logging
from common import const
__all__ = ["DatetimeRangeFilter", "IDSpmFilter", "CustomFilter"]
class DatetimeRangeFilter(filters.BaseFilterBackend):
def filter_queryset(self, request, queryset, view):
if not hasattr(view, 'date_range_filter_fields'):
return queryset
try:
fields = dict(view.date_range_filter_fields)
except ValueError:
msg = "View {} datetime_filter_fields set is error".format(view.name)
logging.error(msg)
return queryset
kwargs = {}
for attr, date_range_keyword in fields.items():
if len(date_range_keyword) != 2:
continue
for i, v in enumerate(date_range_keyword):
value = request.query_params.get(v)
if not value:
continue
try:
field = DateTimeField()
value = field.to_internal_value(value)
if i == 0:
lookup = "__gte"
else:
lookup = "__lte"
kwargs[attr+lookup] = value
except ValidationError as e:
print(e)
continue
if kwargs:
queryset = queryset.filter(**kwargs)
return queryset
class IDSpmFilter(filters.BaseFilterBackend):
def get_schema_fields(self, view):
return [
coreapi.Field(
name='spm', location='query', required=False,
type='string', example='',
description='Pre post objects id get spm id, then using filter'
)
]
def filter_queryset(self, request, queryset, view):
spm = request.query_params.get('spm')
if not spm:
return queryset
cache_key = const.KEY_CACHE_RESOURCES_ID.format(spm)
resources_id = cache.get(cache_key)
if not resources_id or not isinstance(resources_id, list):
return queryset
queryset = queryset.filter(id__in=resources_id)
return queryset
class CustomFilter(filters.BaseFilterBackend):
def get_schema_fields(self, view):
fields = []
defaults = dict(
location='query', required=False,
type='string', example='',
description=''
)
if not hasattr(view, 'custom_filter_fields'):
return []
for field in view.custom_filter_fields:
if isinstance(field, str):
defaults['name'] = field
elif isinstance(field, dict):
defaults.update(field)
else:
continue
fields.append(coreapi.Field(**defaults))
return fields
def filter_queryset(self, request, queryset, view):
return queryset