OK, now I understood Ecto.Enum - turns out it does exactly what I want:
defmodule Person do
use Ecto.Schema
@primary_key false
embedded_schema do
field(:id, :integer)
field(:name, :string, null: false)
field(:age, :integer)
field(:job, Ecto.Enum, values: Job.ids())
field(:hobbies, {:array, Ecto.Enum}, values: Hobby.ids())
field(:friends, {:array, :integer})
end
end
defmodule Hobby do
@hobbies [:hobby_painting, :hobby_freeclimbing, :hobby_stampcollecting]
def ids(), do: @hobbies
end
iex(1)> data = %{id: 1, name: "Bob", age: "18", job: "job_programmer", friends: [2, 4711], hobbies: ["hobby_freeclimbing", "hobby_painting"]}
iex(2)> p = Ecto.Changeset.cast(%Person{}, data, Map.keys(data)) |> Ecto.Changeset.apply_changes()
%Person{
age: 18,
friends: [2, 4711],
hobbies: [:hobby_freeclimbing, :hobby_painting],
id: 1,
job: :job_programmer,
name: "Bob"
}
:
