Make ex_constructor a TypedStruct plugin #2
Description
Since upstream TypedStruct 0.2.0 now supports plugins, Contructor could be a plugin. This way, it would be composable with other TypedStruct plugins.
The API would look like:
defmodule ConstructorExampleUser do
use TypedStruct
# Use the “standard” typedstruct macro.
typedstruct do
plugin Constructor # Register Constructor as a plugin. Code can be injected here.
plugin TypedStructLens # Let’s say we also want to generate lenses.
field :id, integer(), constructor: &is_integer/1, enforce: true
field :role, :user | :admin, constructor: &is_valid_role/1, enforce: true
field :first_name, String.t(), default: "", constructor: &is_string/1
field :last_name, String.t(), default: "", constructor: &is_string/1
end
def is_valid_role(value) do
case value do
:admin -> {:ok, value}
:user -> {:ok, value}
_ -> {:error, "invalid role!"}
end
end
end