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A collection of handy Elixir macros for CQRS applications.
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lib/cqrs/absinthe/args.ex
if Code.ensure_loaded?(Absinthe) do
defmodule Cqrs.Absinthe.Args do
@moduledoc false
def extract_args(fields, opts) do
only = Keyword.get(opts, :only, [])
except = Keyword.get(opts, :except, [])
fields =
case {only, except} do
{[], []} -> fields
{[], except} -> Enum.reject(fields, &Enum.member?(except, elem(&1, 0)))
{only, []} -> Enum.filter(fields, &Enum.member?(only, elem(&1, 0)))
_ -> raise "You can only specify :only or :except"
end
fields
|> Enum.reject(fn {_name, _type, opts} -> Keyword.get(opts, :internal, false) == true end)
|> Enum.map(fn field ->
{name, _type, field_opts} = field
absinthe_type = absinthe_type(field, opts)
required = Keyword.get(field_opts, :required, false)
{name, absinthe_type, required}
end)
end
defp absinthe_type({name, :map, _}, opts) do
source = Keyword.get(opts, :source)
macro = Keyword.get(opts, :macro)
map_type =
get_configured_type_mapping(:map) || get_named_arg_type_mapping(name, opts) ||
raise Cqrs.Absinthe.MapTypeMappingError, source: source, macro: macro, type: name
quote do: unquote(map_type)
end
defp absinthe_type({name, {:array, type}, _}, opts) do
type = absinthe_type({name, type, nil}, opts)
quote do: list_of(unquote(type))
end
defp absinthe_type({name, Ecto.Enum, _}, opts) do
source = Keyword.get(opts, :source)
macro = Keyword.get(opts, :macro)
enum_type =
get_named_arg_type_mapping(name, opts) ||
raise Cqrs.Absinthe.EnumTypeMappingError, source: source, macro: macro, type: name
quote do: unquote(enum_type)
end
defp absinthe_type({_name, :binary_id, _}, _opts), do: quote(do: :id)
defp absinthe_type({_name, type, _}, _opts), do: quote(do: unquote(type))
defp get_configured_type_mapping(type) do
:cqrs_tools
|> Application.get_env(:absinthe, [])
|> Keyword.get(:type_mappings, [])
|> Keyword.get(type)
end
def get_named_arg_type_mapping(name, opts) do
opts
|> Keyword.get(:arg_types, [])
|> Keyword.get(name)
end
end
end