+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
defmodule Pleroma.Pagination do
@moduledoc """
Implements Mastodon-compatible pagination.
@default_limit 20
- def fetch_paginated(query, params) do
+ def fetch_paginated(query, params, type \\ :keyset)
+
+ def fetch_paginated(query, params, :keyset) do
options = cast_params(params)
query
- |> paginate(options)
+ |> paginate(options, :keyset)
|> Repo.all()
|> enforce_order(options)
end
- def paginate(query, options) do
+ def fetch_paginated(query, params, :offset) do
+ options = cast_params(params)
+
+ query
+ |> paginate(options, :offset)
+ |> Repo.all()
+ end
+
+ def paginate(query, options, method \\ :keyset)
+
+ def paginate(query, options, :keyset) do
query
|> restrict(:min_id, options)
|> restrict(:since_id, options)
|> restrict(:limit, options)
end
+ def paginate(query, options, :offset) do
+ query
+ |> restrict(:offset, options)
+ |> restrict(:limit, options)
+ end
+
defp cast_params(params) do
param_types = %{
min_id: :string,
since_id: :string,
max_id: :string,
+ offset: :integer,
limit: :integer
}
order_by(query, [u], fragment("? desc nulls last", u.id))
end
+ defp restrict(query, :offset, %{offset: offset}) do
+ offset(query, ^offset)
+ end
+
defp restrict(query, :limit, options) do
limit = Map.get(options, :limit, @default_limit)