Heroku Deploy:URI::InvalidURIError:错误的URI(不是URI?): ://用户:pass@127.0.0.1/dbname

而不是 require 'rails/all'

require File.expand_path('../boot', __FILE__)

# Require the gems listed in Gemfile, including any gems
# you've limited to :test, :development, or :production.
Bundler.require(*Rails.groups)

require "rails"
# Pick the frameworks you want:
require "active_model/railtie"
require "active_job/railtie"
# require "active_record/railtie"
# require "active_storage/engine"
require "action_controller/railtie"
require "action_mailer/railtie"
require "action_mailbox/engine"
# require "action_text/engine"
require "action_view/railtie"
require "action_cable/engine"
require "sprockets/railtie"

module Draw
  class Application < Rails::Application
    # You don't need this nonsense since you don't even have config/application.yml
    #  ENV.update YAML.load_file('config/application.yml')[Rails.env] rescue {}
    # Settings in config/environments/* take precedence over those specified here.
    # Application configuration should go into files in config/initializers
    # -- all .rb files in that directory are automatically loaded.

    # Set Time.zone default to the specified zone and make Active Record auto-convert to this zone.
    # Run "rake -D time" for a list of tasks for finding time zone names. Default is UTC.
    # config.time_zone = 'Central Time (US & Canada)'

    # The default locale is :en and all translations from config/locales/*.rb,yml are auto loaded.
    # config.i18n.load_path += Dir[Rails.root.join('my', 'locales', '*.{rb,yml}').to_s]
    # config.i18n.default_locale = :de

    # Do not swallow errors in after_commit/after_rollback callbacks.
    # config.active_record.raise_in_transactional_callbacks = true
  end
end

如果你不想使用ActiveRecord,你可以去掉它 /db /config/database.yml .

gem 'rake' 在你的Gemfile中,rails依赖于它。

Max commented ,在新的应用程序中,可以通过 rails new app_name --skip-active-record --api this explanation