1 defmodule Pleroma.Pagination do
3 Implements Mastodon-compatible pagination.
13 def fetch_paginated(query, params) do
14 options = cast_params(params)
19 |> enforce_order(options)
22 def paginate(query, options) do
24 |> restrict(:min_id, options)
25 |> restrict(:since_id, options)
26 |> restrict(:max_id, options)
27 |> restrict(:order, options)
28 |> restrict(:limit, options)
31 defp cast_params(params) do
39 changeset = cast({%{}, param_types}, params, Map.keys(param_types))
43 defp restrict(query, :min_id, %{min_id: min_id}) do
44 where(query, [q], q.id > ^min_id)
47 defp restrict(query, :since_id, %{since_id: since_id}) do
48 where(query, [q], q.id > ^since_id)
51 defp restrict(query, :max_id, %{max_id: max_id}) do
52 where(query, [q], q.id < ^max_id)
55 defp restrict(query, :order, %{min_id: _}) do
56 order_by(query, [u], fragment("? asc nulls last", u.id))
59 defp restrict(query, :order, _options) do
60 order_by(query, [u], fragment("? desc nulls last", u.id))
63 defp restrict(query, :limit, options) do
64 limit = Map.get(options, :limit, @default_limit)
70 defp restrict(query, _, _), do: query
72 defp enforce_order(result, %{min_id: _}) do
77 defp enforce_order(result, _), do: result