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A toolkit for data mapping and language integrated query for Elixir
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lib/ecto/model/timestamps.ex
defmodule Ecto.Model.Timestamps do
@moduledoc """
Automatically manage timestamps.
If the user calls `Ecto.Schema.timestamps/0` in their schema, the
model will automatically set callbacks based on the schema information
to update the configured `:inserted_at` and `:updated_at` fields
according to the given type.
"""
defmacro __using__(_) do
quote do
@before_compile Ecto.Model.Timestamps
end
end
import Ecto.Changeset
@doc """
Puts a timestamp in the changeset with the given field and type.
"""
def put_timestamp(changeset, field, type, use_usec) do
if skip_timestamp?(changeset, field) do
changeset
else
{:ok, value} = Ecto.Type.load(type, timestamp_tuple(use_usec))
force_change changeset, field, value
end
end
defp skip_timestamp?(changeset, field) do
get_change(changeset, field) &&
# If we are on update and the data came from the model,
# we can't effectively track changes so we force an update.
not (changeset.action == :update and changeset.opts[:source] == :model)
end
defp timestamp_tuple(_use_usec = true) do
erl_timestamp = :os.timestamp
{_, _, usec} = erl_timestamp
{date, {h, m, s}} =:calendar.now_to_datetime(erl_timestamp)
{date, {h, m, s, usec}}
end
defp timestamp_tuple(_use_usec = false) do
{date, {h, m, s}} = :erlang.universaltime
{date, {h, m, s, 0}}
end
defmacro __before_compile__(env) do
timestamps = Module.get_attribute(env.module, :ecto_timestamps)
if timestamps do
args = [timestamps[:type], timestamps[:usec]]
inserted_at =
if field = Keyword.fetch!(timestamps, :inserted_at) do
quote do
before_insert Ecto.Model.Timestamps, :put_timestamp, [unquote(field)|args]
end
end
updated_at =
if field = Keyword.fetch!(timestamps, :updated_at) do
quote do
before_insert Ecto.Model.Timestamps, :put_timestamp, [unquote(field)|args]
before_update Ecto.Model.Timestamps, :put_timestamp, [unquote(field)|args]
end
end
quote do
args = unquote(args)
unquote(inserted_at)
unquote(updated_at)
end
end
end
end