add enforce_keys option

CHANGELOG.md

@@ -1,5 +1,10 @@
 ## Changelog
 
+## v2.1.10
+
+* Enhancements
+  * Add `enforce_keys` option to not enforce keys when building struct
+
 ## v2.1.9
 
 * Enhancements

lib/construct.ex

@@ -58,6 +58,7 @@ defmodule Construct do
 
     quote do
       @behaviour Construct
+      @construct_opts unquote(opts)
 
       unquote(pre_ast)
 
@@ -275,7 +276,12 @@ defmodule Construct do
       |> Enum.reverse()
 
     quote do
-      @enforce_keys unquote(enforce_fields)
+      enforce_keys = Keyword.get(@construct_opts, :enforce_keys, true)
+
+      if enforce_keys do
+        @enforce_keys unquote(enforce_fields)
+      end
+
       defstruct unquote(Macro.escape(fields))
     end
   end

mix.exs

@@ -4,7 +4,7 @@ defmodule Construct.Mixfile do
   def project do
     [
       app: :construct,
-      version: "2.1.9",
+      version: "2.1.10",
       elixir: "~> 1.5",
       deps: deps(),
       elixirc_paths: elixirc_paths(Mix.env),

test/integration/struct_test.exs

@@ -53,6 +53,14 @@ defmodule Construct.Integration.StructTest do
     end
   end
 
+  defmodule Test5 do
+    use Construct, enforce_keys: false
+
+    structure do
+      field :a, :string
+    end
+  end
+
   test "struct should be equal with make" do
     assert struct!(Test0) == Test0.make!()
   end
@@ -96,6 +104,8 @@ defmodule Construct.Integration.StructTest do
     end)
 
     assert {:ok, %Test4{a: %Time{}}} = Test4.make()
+
+    assert %Test5{a: nil} = struct!(Test5)
   end
 
   test "cycle deps" do