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one_piece_commanded
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Extend Commanded package
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lib/one_piece/commanded/query_handler.ex
defmodule OnePiece.Commanded.QueryHandler do
@type t :: struct()
@type error :: any()
@doc """
Handle the incoming `params` and return the result data.
"""
@callback handle(params :: any()) :: {:ok, t()} | {:error, error()}
@doc """
Convert the module into a `OnePiece.Commanded.QueryHandler`.
## Usage
defmodule MyQueryHandler do
use OnePiece.Commanded.QueryHandler
import Ecto.Query, only: [from: 2]
@impl OnePiece.Commanded.QueryHandler
def handle(params) do
query = from u in User,
where: u.age > 18 or is_nil(params.email),
select: u
{:ok, Repo.all(query)}
end
end
"""
defmacro __using__ do
quote do
@behaviour OnePiece.Commanded.QueryHandler
end
end
end