Use alias_method for better readability

app-policies-application_policy.rb

# app/policies/application_policy.rb
class ApplicationPolicy
  attr_reader :user, :record
  def initialize(current_user, record)
    @user = user
    @record = record
  end
end

app-policies-post_policy.rb

# app/policies/post_policy.rb
class PostPolicy < ApplicationPolicy
  alias_method :post, :record

  def update?
    post.user == user
  end
end