You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: custom_finder_methods.rb
    path of file: ./repos/sorbet-rails/lib/sorbet-rails/model_plugins
    
    the code of the file until where you have to start completion: # typed: strict
require ('sorbet-rails/model_plugins/base')
class SorbetRails::ModelPlugins::CustomFinderMethods < SorbetRails::ModelPlugins::Base

  sig { override.params(root: Parlour::RbiGenerator::Namespace).void }
  def generate(root)
    model_class_rbi = root.create_class(self.model_class_name)
    model_relation_class_rbi = root.create_class(self.model_relation_class_name)
    model_assoc_proxy_class_rbi = root.create_class(self.model_assoc_proxy_class_name)
    model_assoc_relation_rbi = root.create_class(self.model_assoc_relation_class_name)

    custom_module_name = self.model_module_name("CustomFinderMethods")
    custom_module_rbi = root.create_module(custom_module_name)

    # and include the rbi module
    model_class_rbi.create_extend(custom_module_name)
    model_relation_class_rbi.create_include(custom_module_name)
    model_assoc_proxy_class_rbi.create_include(custom_module_name)
    model_assoc_relation_rbi.create_include(custom_module_name)

    custom_module_rbi.create_method(
      "first_n",
      parameters: [ Parameter.new("limit", type: "Integer") ],
      return_type: "T::Array[#{self.model_class_name}]",
    )

    custom_module_rbi.create_method(
      "last_n",
      parameters: [ Parameter.new("limit", type: "Integer") ],
      return_type: "T::Array[#{self.model_class_name}]",
    )

    custom_module_rbi.
    
  def generate(root)
    model_class_rbi = root.create_class(self.model_class_name)
    model_relation_class_rbi = root.create_class(self.model_relation_class_name)
    model_assoc_proxy_class_rbi = root.create_class(self.model_assoc_proxy_class_name)
    model_assoc_relation_rbi = root.create_class(self.model_assoc_relation_class_name)

    custom_module_name = self.model_module_name("CustomFinderMethods")
    custom_module_rbi = root.create_module(custom_module_name)

    # and include the rbi module
    model_class_rbi.create_extend(custom_module_name)
    model_relation_class_rbi.create_include(custom_module_name)
    model_assoc_proxy_class_rbi.create_include(custom_module_name)
    model_assoc_relation_rbi.create_include(custom_module_name)

    custom_module_rbi.create_method(
      "first_n",
      parameters: [ Parameter.new("limit", type: "Integer") ],
      return_type: "T::Array[#{self.model_class_name}]",
    )

    custom_module_rbi.create_method(
      "last_n",
      parameters: [ Parameter.new("limit", type: "Integer") ],
      return_type: "T::Array[#{self.model_class_name}]",
    )

    custom_module_rbi.create_method(
      "find_n",
      parameters: [ Parameter.new("*args", type: "T::Array[T.any(Integer, String)]") ],
      return_type: "T::Array[#{self.model_class_name}]",
    )

    # allow common cases find_by_id
    custom_module_rbi.create_method(
      "find_by_id",
      parameters: [ Parameter.new("id", type: "T.nilable(Integer)") ],
      return_type: "T.nilable(#{self.model_class_name})",
    )
    custom_module_rbi.create_method(
      "find_by_id!",
      parameters: [ Parameter.new("id", type: "Integer") ],
      return_type: self.model_class_name,
    )
  end