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eventstore
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Event store using PostgreSQL for persistence.
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lib/event_store/jsonb_serializer.ex
defmodule EventStore.JsonbSerializer do
@moduledoc """
Serialize to/from PostgreSQL's native `jsonb` format.
"""
@behaviour EventStore.Serializer
def serialize(%_{} = term) do
term
|> Map.from_struct()
|> Enum.map(fn {k, v} -> {Atom.to_string(k), v} end)
|> Enum.into(%{})
end
def serialize(term), do: term
def deserialize(term, config) do
case Keyword.get(config, :type, nil) do
nil ->
term
type ->
type
|> String.to_existing_atom()
|> to_struct(term)
end
end
# See https://groups.google.com/d/msg/elixir-lang-talk/6geXOLUeIpI/L9einu4EEAAJ
def to_struct(type, term) do
struct = struct(type)
Enum.reduce(Map.to_list(struct), struct, fn {k, _}, acc ->
case Map.fetch(term, Atom.to_string(k)) do
{:ok, v} -> %{acc | k => v}
:error -> acc
end
end)
end
end