Since attributes are an instantiated class now, renamed AttributeSerializer to Attribute

lib/fast_jsonapi/attribute.rb

@@ -1,5 +1,5 @@
 module FastJsonapi
-  class AttributeSerializer
+  class Attribute
     attr_reader :key, :method, :conditional_proc
 
     def initialize(key:, method:, options: {})

lib/fast_jsonapi/object_serializer.rb

@@ -3,7 +3,7 @@
 require 'active_support/core_ext/object'
 require 'active_support/concern'
 require 'active_support/inflector'
-require 'fast_jsonapi/attribute_serializer'
+require 'fast_jsonapi/attribute'
 require 'fast_jsonapi/serialization_core'
 
 module FastJsonapi
@@ -156,7 +156,7 @@ module FastJsonapi
         attributes_list.each do |attr_name|
           method_name = attr_name
           key = run_key_transform(method_name)
-          attributes_to_serialize[key] = AttributeSerializer.new(
+          attributes_to_serialize[key] = Attribute.new(
             key: key,
             method: block || method_name,
             options: options