32 lines
1.1 KiB
Python
32 lines
1.1 KiB
Python
"""Shared pagination classes.
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`CreatedCursorPagination` is the canonical choice for infinite-scroll feeds
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(posts feed, chat message history). Cursor pagination keeps a stable view of
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results even when new items are created at the head, which page/offset
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pagination does not.
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"""
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from rest_framework.pagination import CursorPagination
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class CreatedCursorPagination(CursorPagination):
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"""Cursor pagination ordered by `-created_at` (newest first)."""
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page_size = 20
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ordering = '-created_at'
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cursor_query_param = 'cursor'
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page_size_query_param = 'page_size'
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max_page_size = 100
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class CreatedAscCursorPagination(CursorPagination):
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"""Cursor pagination ordered by `created_at` (oldest first).
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Used for chat history scroll-back where messages are displayed oldest -> newest
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and pagination walks backwards in time from the most recent.
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"""
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page_size = 30
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ordering = '-created_at' # backend orders newest-first; client reverses for display
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cursor_query_param = 'cursor'
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page_size_query_param = 'page_size'
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max_page_size = 100
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