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manjufy/flatten_nested_json.ex

Forked from poteto/flatten_nested_json.ex
Created April 8, 2017 11:53
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Flatten deeply nested Map in Elixir
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flatten_nested_json.ex
defmodule Json do
def flatten(%{} = json) do
json
|> Map.to_list()
|> to_flat_map(%{})
end
def flatten(%{} = json) when json == %{}, do: %{}
defp to_flat_map([{_k, %{} = v} | t], acc), do: to_flat_map(Map.to_list(v), to_flat_map(t, acc))
defp to_flat_map([{k, v} | t], acc), do: to_flat_map(t, Map.put_new(acc, k, v))
defp to_flat_map([], acc), do: acc
end
%{id: "1", foo: %{bar: %{qux: "hello world"}, baz: 123}}
|> Json.flatten()
|> IO.inspect()
# %{baz: 123, id: "1", qux: "hello world"}
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