Handle nested constructors

[sitch]

Would be nice to have something akin to the

%{"nestedField" => %{id: 1}}
|>  Poison.decode! as: %Model{nested_field: [%Nested{}]}

See https://github.com/devinus/poison/pull/58/files

[gamache]

Hi, and thanks for the feature request! I like the syntax you've proposed, so I am going to use this as the active issue for this feature.

[benregn]

Did this feature ever land?

[gamache]

It never did -- it wasn't a pain point here at Appcues, so we never ended up implementing this directly.

Since the constructor created by ExConstructor is marked by defoverridable, the super keyword can be used to the same effect:

iex(3)> defmodule Inner do
...(3)>   defstruct [:b]     
...(3)>   use ExConstructor
...(3)> end
{:module, Inner, <<...>>, :ok}
iex(4)> defmodule Outer do
...(4)>   defstruct [:a, :inner]    
...(4)>   use ExConstructor
...(4)>   def new(map) do
...(4)>     struct = super(map)
...(4)>     %{struct | inner: Inner.new(struct.inner)}
...(4)>   end
...(4)> end
{:module, Outer, <<...>>, :ok}
iex(5)> Outer.new(%{a: 1, inner: %{b: 99}})
%Outer{a: 1, inner: %Inner{b: 99}}