frenzy/lib/frenzy_web/views/feed_view.ex

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Elixir
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defmodule FrenzyWeb.FeedView do
use FrenzyWeb, :view
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alias Frenzy.{Repo, Item}
import Ecto.Query
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@spec next_page_path(Plug.Conn.t(), [Frenzy.Item.t()]) :: String.t() | nil
def next_page_path(_conn, []), do: nil
def next_page_path(conn, items) do
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%Item{id: id, date: date} = List.last(items)
has_older = Repo.exists?(from i in Item, where: i.date < ^date)
if has_older do
Phoenix.Controller.current_path(conn, %{before: id})
else
nil
end
end
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@spec prev_page_path(Plug.Conn.t(), [Frenzy.Item.t()]) :: String.t() | nil
def prev_page_path(_conn, []), do: nil
def prev_page_path(conn, [%Item{id: id, date: date} | _]) do
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has_newer = Repo.exists?(from i in Item, where: i.date > ^date)
if has_newer do
Phoenix.Controller.current_path(conn, %{after: id})
else
nil
end
end
end