我想你是错过了gem，添加这一行到Gemfile然后运行bundle install

gem "recaptcha", "~> 5.12"

字符串
然后用这些内容创建初始化器文件

Recaptcha.configure do |config|
  config.site_key  = Rails.application.credentials.dig(:google_recaptcha, :site_key)
  config.secret_key = Rails.application.credentials.dig(:google_recaptcha, :secret_key)

  # Uncomment the following line if you are using a proxy server:
  # config.proxy = 'http://myproxy.com.au:8080'

  # Uncomment the following lines if you are using the Enterprise API:
  # config.enterprise = true
  # config.enterprise_api_key = 'AIzvFyE3TU-g4K_Kozr9F1smEzZSGBVOfLKyupA'
  # config.enterprise_project_id = 'my-project'
end

型
把这个加到你的苗条档案里

= recaptcha_tags(noscript: false)

型
这个应该能用