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: variables_group_seeder.rb
    path of file: ./repos/gitlabhq/lib/gitlab/seeders/ci
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module Gitlab
  module Seeders
    module Ci
      class VariablesGroupSeeder
        DEFAULT_SEED_COUNT = 10
        
    
        def create_ci_variable(id)
          env = environment_scope == 'unique' ? "env_#{id}" : environment_scope
          key = "#{prefix}#{id}"

          if group.variables.by_environment_scope(env).find_by_key(key).present?
            warn "WARNING: Group CI Variable with key '#{key}' already exists. Skipping to next CI variable..."
            return
          end