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The JSON:API extension for the Ash Framework.
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lib/ash_json_api/includes/includer.ex
defmodule AshJsonApi.Includes.Includer do
@moduledoc false
alias AshJsonApi.Request
@spec get_includes(record_or_records :: struct | list(struct) | nil, Request.t()) ::
{struct | list(struct), list(struct)}
def get_includes(nil, _) do
{nil, []}
end
def get_includes(record_or_records, %Request{includes: includes}) when includes == %{},
do: {record_or_records, []}
def get_includes(records, %Request{includes_keyword: includes_keyword})
when is_list(records) do
{records, includes_map} = get_includes_map(records, includes_keyword)
{records, Map.values(includes_map)}
end
def get_includes(%{results: results} = paginator, request) do
{records, includes} = get_includes(results, request)
{%{paginator | results: records}, includes}
end
def get_includes(record, request) do
{[record], includes} = get_includes([record], request)
{record, includes}
end
defp get_includes_map(preloaded, includes_keyword, includes_map \\ %{})
defp get_includes_map(related, [], includes_map), do: {related, includes_map}
defp get_includes_map(preloaded, %Ash.Query{load: load}, includes_map),
do: get_includes_map(preloaded, load, includes_map)
defp get_includes_map(preloaded, includes_keyword, includes_map) do
includes_keyword
|> Enum.reduce({preloaded, includes_map}, fn
{relationship, further}, {preloaded_without_linkage, includes_map} ->
linkage_only? =
case further do
%{__linkage_only__: true} -> true
_ -> false
end
{related, includes_map} =
preloaded
|> Enum.flat_map(fn record ->
record
|> Map.get(relationship, [])
|> List.wrap()
end)
|> get_includes_map(further, includes_map)
preloaded_with_linkage =
Enum.map(
preloaded_without_linkage,
fn record ->
related =
record
|> Map.get(relationship, [])
|> List.wrap()
add_linkage(record, relationship, related)
end
)
includes_map =
if linkage_only? do
includes_map
else
related
|> List.wrap()
|> Enum.reduce(includes_map, fn related_item, includes_map ->
type = AshJsonApi.Resource.Info.type(related_item)
id = AshJsonApi.Resource.encode_primary_key(related_item)
case Map.fetch(includes_map, {type, id}) do
{:ok, _} ->
Map.update!(includes_map, {type, id}, fn existing ->
merge_linkages(existing, related_item)
end)
:error ->
Map.put(includes_map, {type, id}, Map.put_new(related_item, :__linkage__, %{}))
end
end)
end
{preloaded_with_linkage, includes_map}
end)
end
defp add_linkage(record, relationship, related) do
record
|> Map.put_new(:__linkage__, %{})
|> Map.update!(:__linkage__, fn linkage ->
Map.put(linkage, relationship, related)
end)
end
defp merge_linkages(record, to_merge) do
linkage_to_merge = Map.get(to_merge, :__linkage__, %{})
record
|> Map.update!(:__linkage__, fn linkage ->
Map.merge(linkage, linkage_to_merge, fn _key, a, b ->
a ++ b
end)
end)
end
end