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ecto
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0.1.0
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 get_change changeset, field do
changeset
else
force_change changeset, field, Ecto.Type.load!(type, timestamp_tuple(use_usec))
end
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
type = timestamps[:type]
usec = timestamps[:usec]
inserted_at = if field = Keyword.fetch!(timestamps, :inserted_at) do
quote do
before_insert Ecto.Model.Timestamps, :put_timestamp, [unquote(field), unquote(type), unquote(usec)]
end
end
updated_at = if field = Keyword.fetch!(timestamps, :updated_at) do
quote do
before_insert Ecto.Model.Timestamps, :put_timestamp, [unquote(field), unquote(type), unquote(usec)]
before_update Ecto.Model.Timestamps, :put_timestamp, [unquote(field), unquote(type), unquote(usec)]
end
end
{inserted_at, updated_at}
end
end
end