fix: default value set to true causes undefined method [] error (#108)

lib/typed/serializer.rb

@@ -35,8 +35,8 @@ def deserialize_from_creation_params(creation_params)
       results = schema.fields.map do |field|
         value = creation_params.fetch(field.name, nil)
 
-        if value.nil? && field.default
-          Success.new(Validations::ValidatedValue.new(field.default))
+        if value.nil? && !field.default.nil?
+          Success.new(Validations::ValidatedValue.new(name: field.name, value: field.default))
         elsif value.nil? || field.works_with?(value)
           field.validate(value)
         else

test/typed/hash_serializer_test.rb

@@ -1,6 +1,18 @@
 # typed: true
 
 class HashSerializerTest < Minitest::Test
+  class StructWithBooleanDefaultSetToTrue < T::Struct
+    include ActsAsComparable
+
+    const :tired, T::Boolean, default: true
+  end
+
+  class StructWithBooleanDefaultSetToFalse < T::Struct
+    include ActsAsComparable
+
+    const :tired, T::Boolean, default: false
+  end
+
   def setup
     @serializer = Typed::HashSerializer.new(schema: Typed::Schema.from_struct(Person))
   end
@@ -109,6 +121,22 @@ def test_it_can_deserialize_with_nested_object
     assert_payload(ALEX_PERSON, result)
   end
 
+  def test_it_can_deserialize_with_default_value_boolean_true
+    serializer = Typed::HashSerializer.new(schema: Typed::Schema.from_struct(StructWithBooleanDefaultSetToTrue))
+    result = serializer.deserialize({})
+
+    assert_success(result)
+    assert_payload(StructWithBooleanDefaultSetToTrue.new(tired: true), result)
+  end
+
+  def test_it_can_deserialize_with_default_value_boolean_false
+    serializer = Typed::HashSerializer.new(schema: Typed::Schema.from_struct(StructWithBooleanDefaultSetToFalse))
+    result = serializer.deserialize({})
+
+    assert_success(result)
+    assert_payload(StructWithBooleanDefaultSetToFalse.new(tired: false), result)
+  end
+
   def test_it_reports_validation_errors_on_deserialize
     result = @serializer.deserialize({name: "Max", ruby_rank: RubyRank::Luminary})