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lib/rivet/ecto/collection/touch.ex
defmodule Rivet.Ecto.Collection.Touch do
defmacro __using__(opts) do
quote location: :keep, bind_quoted: [opts: opts] do
@doc """
Update our updated_at but only if it hasn't changed within a minute
(less load)
"""
@update_min_seconds 60
def touch(this_id) when is_binary(this_id) do
with {:ok, this} <- one(id: this_id) do
touch(this)
end
end
def touch(%{id: this_id, updated_at: updated}) do
now = System.monotonic_time(:second) + System.time_offset(:second)
if now - DateTime.to_unix(updated) > @update_min_seconds do
from(u in @model, where: u.id == ^this_id)
|> @repo.update_all(set: [updated_at: DateTime.utc_now()])
end
end
# Allow for models without timestamps.
def touch(this), do: this
end
end
end