feat: object type singleton syntax

README.md

@@ -202,6 +202,14 @@ module Anchor::Types
 end
 ```
 
+#### `Anchor::Types::Object`
+
+```rb
+class CustomPayload < Anchor::Types::Object
+  property :id, Anchor::Types::String, optional: true, description: "ID of payload."
+end
+```
+
 #### `Anchor::Types::Enum`
 
 ```rb

lib/anchor/json_schema/serializer.rb

@@ -18,7 +18,7 @@ def type_property(type)
         when Anchor::Types::Array then { type: "array", items: type_property(type.type) }
         when Anchor::Types::Literal then { enum: [type.value] }
         when Anchor::Types::Reference then { "$ref" => "#/$defs/#{type.name}" }
-        when Anchor::Types::Object then serialize_object(type)
+        when Anchor::Types::Object, Anchor::Types::Object.singleton_class then serialize_object(type)
         when Anchor::Types::Enum.singleton_class then { enum: type.values.map(&:second) }
         when Anchor::Types::Unknown.singleton_class then {}
         else raise RuntimeError

lib/anchor/type_script/serializer.rb

@@ -17,7 +17,7 @@ def type_string(type, depth = 1)
         when Anchor::Types::Array then "Array<#{type_string(type.type, depth)}>"
         when Anchor::Types::Literal then serialize_literal(type.value)
         when Anchor::Types::Reference then type.name
-        when Anchor::Types::Object then serialize_object(type, depth)
+        when Anchor::Types::Object, Anchor::Types::Object.singleton_class then serialize_object(type, depth)
         when Anchor::Types::Enum.singleton_class then type.anchor_schema_name
         when Anchor::Types::Unknown.singleton_class then "unknown"
         else raise RuntimeError

lib/anchor/types.rb

@@ -13,8 +13,23 @@ class Unknown; end
     Literal = Struct.new(:value)
     Union = Struct.new(:types)
     Reference = Struct.new(:name)
-    Object = Struct.new(:properties)
     Property = Struct.new(:name, :type, :optional, :description)
+    class Object
+      attr_reader :properties
+
+      def initialize(properties)
+        @properties = properties
+      end
+
+      class << self
+        attr_reader :properties
+
+        def property(name, type, optional: nil, description: nil)
+          @properties ||= []
+          @properties.push(Property.new(name, type, optional, description))
+        end
+      end
+    end
 
     Relationship = Struct.new(:resource, :resources, :null, :null_elements, keyword_init: true)
 

spec/example/app/resources/exhaustive_resource.rb

@@ -1,18 +1,18 @@
 class ExhaustiveResource < ApplicationResource
-  object = Types::Object.new([
-    Types::Property.new(:a, Types::Literal.new("a")),
-    Types::Property.new("b-dash", Types::Literal.new(1)),
-    Types::Property.new(:c, Types::Maybe.new(Types::String)),
-    Types::Property.new(:d_optional, Types::Maybe.new(Types::String), true),
-  ])
+  class AssertedObject < Types::Object
+    property :a, Types::Literal.new("a")
+    property "b-dash", Types::Literal.new(1)
+    property :c, Types::Maybe.new(Types::String)
+    property :d_optional, Types::Maybe.new(Types::String), optional: true
+  end
 
   attribute :asserted_string, Types::String, description: "My asserted string."
   attribute :asserted_number, Types::Integer
   attribute :asserted_boolean, Types::Boolean
   attribute :asserted_null, Types::Null
   attribute :asserted_unknown, Types::Unknown
-  attribute :asserted_object, object
-  attribute :asserted_maybe_object, Types::Maybe.new(object)
+  attribute :asserted_object, AssertedObject
+  attribute :asserted_maybe_object, Types::Maybe.new(AssertedObject)
   attribute :asserted_array_record, Types::Array.new(Types::Record.new(Types::Integer))
   attribute :asserted_union, Types::Union.new([Types::String, Types::Float])
   attribute :inferred_unknown