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: wp_version.rb
    path of file: ./repos/wpscan/app/models
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module WPScan
  module Model
    # WP Version
    class WpVersion < CMSScanner::Model::Version
      include Vulnerable

      def initialize(number, opts = {})
        raise Error::InvalidWordPressVersion unless WpVersion.valid?(number.to_s)

        super(number, opts)
      end

      # @param [ String ] number
      #
      # @return [ Boolean ] true if the number is a valid WP version, false otherwise
      def self.valid?(number)
        all.include?(number)
      end

      # @return [ Array<String> ] All the version numbers
      def self.all
        return @all_numbers if @all_numbers

        @all_numbers = []

        DB::Fingerprints.wp_fingerprints.each_value do |fp|
          @all_numbers << fp.values
        end

        # @all_numbers.flatten.uniq.sort! {
    
      def self.all
        return @all_numbers if @all_numbers

        @all_numbers = []

        DB::Fingerprints.wp_fingerprints.each_value do |fp|
          @all_numbers << fp.values
        end

        # @all_numbers.flatten.uniq.sort! {} doesn't produce the same result here.
        @all_numbers.flatten!
        @all_numbers.uniq!
        @all_numbers.sort! { |a, b| Gem::Version.new(b) <=> Gem::Version.new(a) }
      end

      # Retrieve the metadata from the vuln API if available (and a valid token is given),
      # or the local metadata db otherwise
      # @return [ Hash ]
      def metadata
        @metadata ||= db_data.empty? ? DB::Version.metadata_at(number) : db_data
      end

      # @return [ Hash ]
      def db_data
        @db_data ||= DB::VulnApi.wordpress_data(number)
      end

      # @return [ Array<Vulnerability> ]
      def vulnerabilities
        return @vulnerabilities if @vulnerabilities

        @vulnerabilities = []

        Array(db_data['vulnerabilities']).each do |json_vuln|
          @vulnerabilities << Vulnerability.load_from_json(json_vuln)
        end

        @vulnerabilities
      end

      # @return [ String ]
      def release_date
        @release_date ||= metadata['release_date'] || 'Unknown'
      end

      # @return [ String ]
      def status
        @status ||= metadata['status'] || 'Unknown'
      end
    end