57 lines
1.8 KiB
Python
57 lines
1.8 KiB
Python
from rest_framework.pagination import LimitOffsetPagination
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from rest_framework.response import Response
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def _positive_int(integer_string):
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ret = int(integer_string)
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if ret < 1:
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raise ValueError()
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return ret
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class CustomLimitOffsetPagination(LimitOffsetPagination):
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limit_query_param = "limit"
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offset_query_param = "offset"
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def paginate_queryset(self, queryset, request, view=None):
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self.limit = self.get_limit(request)
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if self.limit is None:
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return None
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self.count = self.get_count(queryset)
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self.offset = self.get_offset(request)
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self.request = request
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if self.count == 0 or self.offset >= self.count:
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return []
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return list(queryset[self.offset : self.offset + self.limit])
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def get_offset(self, request):
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try:
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return _positive_int(request.query_params[self.offset_query_param])
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except (KeyError, ValueError):
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return 0
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def get_limit(self, request):
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if self.limit_query_param:
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try:
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return _positive_int(request.query_params[self.limit_query_param])
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except (KeyError, ValueError):
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pass
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return self.default_limit
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def get_paginated_response(self, data):
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pages_count = 0 if self.count == 0 else (self.count + self.limit - 1) // self.limit
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current_page = 0 if self.count == 0 else (self.offset // self.limit) + 1
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return Response(
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{
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"pages_count": pages_count,
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"items_per_page": self.limit,
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"current_page_items_count": len(data),
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"current_page": current_page,
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"total_items": self.count,
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"items": data,
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}
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)
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