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: uniqueness_of.rb
    path of file: ./repos/database_validations/lib/database_validations/rubocop/cop
    
    the code of the file until where you have to start completion: module RuboCop
  module Co
    
        def on_send(node)
          if node.method_name == :validates_uniqueness_of
            add_offense(node, location: :selector)
          elsif node.method_name == :validates
            uniqueness(node) do |option|
              add_offense(option)
            end
          end