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spawn_statestores
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0.1.0
Spawn Statestores is the storage lib for the Spawn Actors System
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lib/statestores/schemas/value_object_schema.ex
defmodule Statestores.Schemas.ValueObjectSchema do
@moduledoc """
Models a value object.
A value object is one that has no identity. It is mostly used as an embedded object.
"""
@iso8601_structs [
Date,
DateTime,
NaiveDateTime,
Time
]
defmacro __using__(_opts) do
quote do
use Ecto.Schema
import Ecto.Changeset
import Statestores.Schemas..ValueObjectSchema,
only: [to_map: 1, to_map: 2]
end
end
@doc "Transforms a struct and its inner fields to atom-maps"
@spec to_map(instance :: map(), key_type :: :string_keys | :atom_keys) :: map()
def to_map(instance, key_type \\ :atom_keys) do
instance
|> Map.drop([:__struct__, :__meta__])
|> Map.new(fn
{key, value} -> {cast_key(key, key_type), do_cast_to_map(value, key_type)}
end)
end
defp do_cast_to_map(%schema{} = struct, key_type) do
case schema do
schema when schema in @iso8601_structs ->
struct
_ ->
struct
|> Map.from_struct()
|> do_cast_to_map(key_type)
end
end
defp do_cast_to_map(map, key_type) when is_map(map) do
map
|> Map.drop([:__meta__])
|> Map.to_list()
|> Enum.map(fn
{k, v} -> {cast_key(k, key_type), do_cast_to_map(v, key_type)}
end)
|> Enum.into(%{})
end
defp do_cast_to_map(list, key_type) when is_list(list) do
Enum.map(list, fn
{k, v} -> {cast_key(k, key_type), do_cast_to_map(v, key_type)}
v -> do_cast_to_map(v, key_type)
end)
end
defp do_cast_to_map(value, _key_type), do: value
defp cast_key(key, :atom_keys), do: to_atom(key)
defp cast_key(key, :string_keys), do: to_string(key)
defp to_atom(v) when is_atom(v), do: v
defp to_atom(v), do: String.to_atom(v)
end