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A collection of handy Elixir macros for CQRS applications.
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lib/cqrs/absinthe/errors.ex
if Code.ensure_loaded?(Absinthe) do
defmodule Cqrs.Absinthe.InvalidEnumError do
defexception [:module, :field]
def message(%{module: module, field: field}) do
"The field '#{module}.#{field}' is not an enum."
end
end
defmodule Cqrs.Absinthe.InvalidEnumSourceError do
defexception [:module]
def message(%{module: module}),
do: "#{inspect(module)} is not a Cqrs.Query, Cqrs.Command, or an Ecto.Schema"
end
defmodule Cqrs.Absinthe.MapTypeMappingError do
defexception [:source, :macro, :type]
def message(%{source: source, macro: macro, type: type}) do
example = """
#{macro} #{source}, :return_type,
as: :query_name,
arg_types: [#{IO.ANSI.format([:red, to_string(type), ": :existing_absinthe_type"])}]
"""
"""
Missing absinthe type for the type #{source}.#{type}.
Example:
#{IO.ANSI.format([:blue, example])}
"""
end
end
defmodule Cqrs.Absinthe.EnumTypeMappingError do
defexception [:source, :macro, :type]
def message(%{source: source, macro: macro, type: type}) do
example = """
#{macro} #{source}, :return_type,
as: :query_name,
arg_types: [#{IO.ANSI.format([:red, to_string(type), ": :existing_absinthe_enum_type"])}]
"""
"""
Missing absinthe enum type for the type #{source}.#{type}.
Example:
#{IO.ANSI.format([:blue, example])}
"""
end
end
defmodule Cqrs.Absinthe.Errors do
@moduledoc false
def attach_error_handler(opts) do
{provided_then, opts} = Keyword.pop(opts, :then, &Function.identity/1)
Keyword.put(opts, :then, &handle_errors(&1, provided_then))
end
def handle_errors({:error, {:invalid_command, errors}}, _) do
errors =
Enum.flat_map(errors, fn
{key, messages} -> Enum.map(messages, fn msg -> "#{key} #{msg}" end)
end)
{:error, errors}
end
def handle_errors(other, then) when is_function(then, 1) do
then.(other)
end
end
end