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A collection of handy Elixir macros for CQRS applications.
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lib/cqrs/absinthe/mutation.ex
if Code.ensure_loaded?(Absinthe) do
defmodule Cqrs.Absinthe.Mutation do
@moduledoc false
alias Cqrs.{BoundedContext, Absinthe.Args, Absinthe.Metadata}
def create_input_object(command_module, opts) do
function_name = BoundedContext.__function_name__(command_module, opts)
input_object_fields = create_input_object_fields(command_module, opts)
quote do
input_object unquote(:"#{function_name}_input") do
(unquote_splicing(input_object_fields))
end
end
end
defp create_input_object_fields(command_module, opts) do
command_module.__fields__()
|> Args.extract_args(opts)
|> Enum.map(fn {name, absinthe_type, required, opts} ->
case required do
true -> quote do: field(unquote(name), non_null(unquote(absinthe_type)), unquote(opts))
false -> quote do: field(unquote(name), unquote(absinthe_type), unquote(opts))
end
end)
end
def create_mutatation(command_module, returns, opts) do
function_name = BoundedContext.__function_name__(command_module, opts)
args = create_mutatation_args(command_module, function_name, opts)
quote do
field unquote(function_name), unquote(returns) do
unquote_splicing(args)
resolve(fn args, resolution ->
attrs = Map.get(args, :input, args)
opts = Metadata.merge(resolution, unquote(opts))
BoundedContext.__dispatch_command__(unquote(command_module), attrs, opts)
end)
end
end
end
defp create_mutatation_args(command_module, function_name, opts) do
if Keyword.get(opts, :input_object?, false) do
args =
quote do
arg(:input, unquote(:"#{function_name}_input"))
end
[args]
else
create_mutatation_args(command_module, opts)
end
end
defp create_mutatation_args(command_module, opts) do
command_module.__fields__()
|> Args.extract_args(opts)
|> Enum.map(fn {name, absinthe_type, required, opts} ->
case required do
true -> quote do: arg(unquote(name), non_null(unquote(absinthe_type)), unquote(opts))
false -> quote do: arg(unquote(name), unquote(absinthe_type), unquote(opts))
end
end)
end
end
end