require 'net/http'
require 'uri'

namespace :repository do
  desc "get repositories list and delete old repositories list at 11:00 every day"
  task :get_repositories do
    save_repositories
    delete_repositories
  end

  def save_repositories
    languages.each do |language|

      uri =
          URI.parse("https://api.github.com/search/repositories?q=language:#{language}&sort=stars&order=desc")
      https = Net::HTTP.new(uri.host, uri.port)
      https.use_ssl = true
      response = https.start {
        https.get(uri.request_uri)
      }

      if response.code == '200'
        results = ActiveSupport::JSON.decode response.body
        results["items"].each do |repository|
          Repository.create(name: repository["name"], language: repository["language"],
                            url: repository["html_url"], scores: repository["score"], issues: repository["issues"])
        end
      end
    end
  end

  def delete_repository
    puts "Hello World"
  end

  def languages
    ["Javascript", "Ruby", "Python", "Java", "Go"]
  end
end

class Repository < ApplicationRecord

end

rake aborted!
NameError: uninitialized constant Repository

task get_repositories: :environment do
  hogehoge
end