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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
get_includes_list(records, includes_keyword)
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_list(related, []), do: {related, []}
defp get_includes_list(preloaded, %Ash.Query{load: load}),
do: get_includes_list(preloaded, load)
defp get_includes_list(preloaded, include_keyword) do
include_keyword
|> Enum.reduce({preloaded, []}, fn {relationship, further},
{preloaded_without_linkage, includes_list} ->
{related, further_includes} =
preloaded
|> Enum.flat_map(fn record ->
record
|> Map.get(relationship, [])
|> List.wrap()
end)
|> get_includes_list(further)
preloaded_with_linkage =
Enum.map(
preloaded_without_linkage,
fn record ->
related =
record
|> Map.get(relationship, [])
|> List.wrap()
add_linkage(record, relationship, related)
end
)
{preloaded_with_linkage, [related, further_includes, includes_list]}
end)
|> flatten_includes_list()
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 flatten_includes_list({related, includes_list}) do
{related, List.flatten(includes_list)}
end
end