Adds configurations to infer attributes from

lib/schemable/configuration.rb

@@ -8,7 +8,9 @@ module Schemable
       :custom_type_mappers,
       :disable_factory_bot,
       :use_serialized_instance,
-      :custom_defined_enum_method
+      :custom_defined_enum_method,
+      :infer_attributes_from_custom_method,
+      :infer_attributes_from_jsonapi_serializable
     )
 
     def initialize
@@ -18,8 +20,10 @@ module Schemable
       @custom_type_mappers = {}
       @decimal_as_string = false
       @disable_factory_bot = true
-      @custom_defined_enum_method = nil
       @use_serialized_instance = false
+      @custom_defined_enum_method = nil
+      @infer_attributes_from_custom_method = nil
+      @infer_attributes_from_jsonapi_serializable = false
     end
 
     def type_mapper(type_name)

lib/schemable/definition.rb

@@ -18,7 +18,9 @@ module Schemable
     #  V1::UserSerializer
     #
     def serializer
-      raise NotImplementedError, 'serializer method must be implemented in the definition class'
+      raise NotImplementedError, 'You must implement the serializer method in the definition class in order to use the infer_serializer_from_jsonapi_serializable configuration option.' if configuration.infer_attributes_from_jsonapi_serializable
+
+      nil
     end
 
     # Returns the attributes defined in the serializer (Auto generated from the serializer).
@@ -28,7 +30,11 @@ module Schemable
     # @example
     #  [:id, :name, :email, :created_at, :updated_at]
     def attributes
-      serializer.attribute_blocks.transform_keys { |key| key.to_s.underscore.to_sym }.keys || nil
+      return (serializer&.attribute_blocks&.transform_keys { |key| key.to_s.underscore.to_sym }&.keys || nil) if configuration.infer_attributes_from_jsonapi_serializable
+
+      return model.send(configuration.infer_attributes_from_custom_method).map(&:to_sym) if configuration.infer_attributes_from_custom_method
+
+      model.attribute_names
     end
 
     # Returns the relationships defined in the serializer.
@@ -271,7 +277,7 @@ module Schemable
     # @example
     #  User
     def model
-      self.class.name.gsub('Swagger::Definitions::', '').gsub(':Class', '').constantize
+      self.class.name.gsub('Swagger::Definitions::', '').constantize
     end
 
     def serialized_instance

sig/schemable/configuration.rbs

@@ -1,5 +1,6 @@
 module Schemable
   class Configuration
+
     attr_accessor orm: Symbol
     attr_accessor timestamps: bool
     attr_accessor float_as_string: bool
@@ -8,6 +9,8 @@ module Schemable
     attr_accessor use_serialized_instance: bool
     attr_accessor custom_defined_enum_method: Symbol?
     attr_accessor custom_type_mappers: Hash[Symbol, any]
+    attr_accessor infer_attributes_from_jsonapi_serializable: bool
+    attr_accessor infer_attributes_from_custom_method: Symbol?
 
 
     def initialize: -> void