View Source OnePiece.Commanded.QueryHandler behaviour (OnePiece.Commanded v0.19.1)
Defines a module as a "Query Handler". For more information about queries, please read the following:
Summary
Callbacks
Handle the incoming params and return the result data.
Functions
Convert the module into a OnePiece.Commanded.QueryHandler.
Types
Callbacks
@callback handle(params :: any()) :: {:ok, view_model()} | {:error, error()}
Handle the incoming params and return the result data.
Functions
@spec __using__(opts :: []) :: any()
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