feat: Add schema method to structs (#60)

lib/sorbet-schema.rb

@@ -10,7 +10,7 @@
 loader = Zeitwerk::Loader.new
 loader.push_dir(__dir__.to_s)
 loader.ignore(__FILE__)
-loader.ignore("#{__dir__}/sorbet-schema/*.rb")
+loader.ignore("#{__dir__}/sorbet-schema/**/*.rb")
 loader.inflector.inflect(
   "json_serializer" => "JSONSerializer"
 )
@@ -21,6 +21,12 @@
 # but contains extensions, so we need to manually require it.
 require_relative "sorbet-schema/hash_transformer"
 
+# We want to add a default `schema` method to structs
+# that will guarentee a schema can be created for use
+# with serialization. This can (and should) be overridden
+# in child struct classes.
+require_relative "sorbet-schema/t/struct"
+
 # Sorbet-aware namespace to super-charge your projects
 module Typed
   Value = T.type_alias { T.untyped }

lib/sorbet-schema/t/struct.rb

@@ -0,0 +1,12 @@
+# typed: strict
+
+module T
+  class Struct
+    extend T::Sig
+
+    sig { overridable.returns(Typed::Schema) }
+    def self.schema
+      Typed::Schema.from_struct(self)
+    end
+  end
+end

test/t/struct_test.rb

@@ -0,0 +1,15 @@
+# typed: true
+
+class StructTest < Minitest::Test
+  def test_schema_can_be_derived_from_struct
+    expected_schema = Typed::Schema.new(
+      fields: [
+        Typed::Field.new(name: :name, type: String),
+        Typed::Field.new(name: :capital, type: T::Utils.coerce(T::Boolean))
+      ],
+      target: City
+    )
+
+    assert_equal(expected_schema, City.schema)
+  end
+end