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Add ability to rename attributes #125

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19 changes: 16 additions & 3 deletions lib/saxy/builder.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -77,7 +77,15 @@ end
defimpl Saxy.Builder, for: Any do
defmacro __deriving__(module, _struct, options) do
name = Keyword.fetch!(options, :name)
attribute_fields = Keyword.get(options, :attributes, [])

attribute_fields =
options
|> Keyword.get(:attributes, [])
|> Map.new(fn
field when is_atom(field) -> {field, field}
{field, attribute} -> {field, attribute}
end)

children_fields = Keyword.get(options, :children, [])

quote do
Expand All @@ -87,8 +95,13 @@ defimpl Saxy.Builder, for: Any do

attributes =
struct
|> Map.take(unquote(attribute_fields))
|> Enum.to_list()
|> Map.take(unquote(Map.keys(attribute_fields)))
|> Enum.map(fn {field, value} ->
case unquote(Macro.escape(attribute_fields)) do
%{^field => attribute} -> {attribute, value}
_ -> {field, value}
end
end)

children =
Enum.map(
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10 changes: 10 additions & 0 deletions test/saxy/builder_test.exs
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Original file line number Diff line number Diff line change
Expand Up @@ -114,6 +114,16 @@ defmodule Saxy.BuilderTest do
}
end

defmodule DeliveryOption do
@derive {Saxy.Builder, name: "option", attributes: [:cost, :days, order_before: "order-before"]}
defstruct [:cost, :days, :order_before]
end

test "builds structs with renamed attributes" do
delivery_option = %DeliveryOption{cost: 300, days: 4, order_before: 18}
assert build(delivery_option) == {"option", [{"cost", "300"}, {"days", "4"}, {"order-before", "18"}], []}
end

@tag :property

property "number" do
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