I am not sure if supporting use/* is the right way forward here. The
`Kernel.use/2` macro is reserved for invoking a module's `__using__/1`
macro. To be honest, I don't like the fact that you're setting the module
attributes and defining the `embedded_schema` in the same macro. You can
easily just define the `@primary_key` in the `__using__/1` macro and
explicitly define the `embedded_schema` in `CreateRecurringTransfer`
itself, but that's my preference.
Either way, if you have defined a `__using__/3` macro, you can always
invoke it explicitly. Although I would rename it to avoid any confusion for
developers reading the code in the future and potentially thinking it has
something to do with `Kernel.use/2`.
defmodule Command do
defmacro aggregate_schema(opts \\ [], do: block) do
unless Keyword.has_key?(opts, :aggregate_identifier) do
raise ArgumentError, "Missing :aggregate_identifier key"
end
aggregate_identifier = Keyword.fetch!(opts, :aggregate_identifier)
quote do
use Ecto.Schema
@primary_key { @aggregate_identifier_key, :binary_id, autogenerate:
true }
@derive Jason.Encoder
embedded_schema unquote(block)
end
end
end
defmodule CreateRecurringTransfer do
require Command
Command.aggregate_schema [aggregate_identifier: :id] do
field(:dtstart, :naive_datetime)
field(:dtend, :naive_datetime)
embeds_one(:amount, PositiveAmount)
embeds_one(:rrule, Rrule)
embeds_one(:owned_by, CustomerIdentity)
embeds_one(:from_account, TransferAccount)
embeds_one(:to_account, TransferAccount)
end
end
On Sunday, 8 August 2021 at 16:15:59 UTC-4 [email protected] wrote:
> I am trying to do the following,
>
> defmodule Command do
> defmacro __using__(opts \\ [], do: block) do
> unless Keyword.has_key?(opts, :aggregate_identifier) do
> raise ArgumentError, "Missing :aggregate_identifier key"
> end
>
> aggregate_identifier = Keyword.fetch!(opts, :aggregate_identifier)
>
> quote do
> use Ecto.Schema
> @primary_key { @aggregate_identifier_key, :binary_id, autogenerate:
> true }
> @derive Jason.Encoder
> embedded_schema unquote(block)
> end
> end
> end
>
>
> Just so I can do something like,
>
> defmodule CreateRecurringTransfer do
> use Command, [aggregate_identifier: :id] do
> field(:dtstart, :naive_datetime)
> field(:dtend, :naive_datetime)
> embeds_one(:amount, PositiveAmount)
> embeds_one(:rrule, Rrule)
> embeds_one(:owned_by, CustomerIdentity)
> embeds_one(:from_account, TransferAccount)
> embeds_one(:to_account, TransferAccount)
> end
> end
>
> But I get `** (CompileError) iex:3: undefined function use/3` which I
> assume what I am trying to do is not supported.
>
> I am curious to understand why it doesn't work (beside maybe not being
> supported), and what would be the problem by trying to support it
>
--
You received this message because you are subscribed to the Google Groups
"elixir-lang-core" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/elixir-lang-core/46c25948-b96e-4982-b710-0ebeae1b5e96n%40googlegroups.com.
