Created
September 27, 2023 20:33
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defmodule MapHelpers do | |
@iso8601_structs [ | |
Date, | |
DateTime, | |
NaiveDateTime, | |
Time | |
] | |
@doc """ | |
Transforms a struct and its inner fields to the given key type | |
""" | |
@spec from_struct(instance :: map()) :: map() | |
def from_struct(instance) do | |
instance | |
|> Map.drop([:__struct__, :__meta__]) | |
|> Map.new(fn | |
{key, value} -> {key, do_cast_from_struct(value)} | |
end) | |
end | |
defp do_cast_from_struct(%schema{} = struct) do | |
case schema do | |
schema when schema in @iso8601_structs -> | |
struct | |
_ -> | |
struct | |
|> Map.from_struct() | |
|> do_cast_from_struct() | |
end | |
end | |
defp do_cast_from_struct(map) when is_map(map) do | |
map | |
|> Map.drop([:__meta__]) | |
|> Map.to_list() | |
|> Enum.map(fn | |
{k, v} -> {k, do_cast_from_struct(v)} | |
end) | |
|> Enum.into(%{}) | |
end | |
defp do_cast_from_struct(list) when is_list(list) do | |
Enum.map(list, fn | |
{k, v} -> {k, do_cast_from_struct(v)} | |
v -> do_cast_from_struct(v) | |
end) | |
end | |
defp do_cast_from_struct(value), do: value | |
end |
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