railties/lib/rails/generators/rails/app/templates/config/environments/development.rb.tt

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require "active_support/core_ext/integer/time"

Rails.application.configure do
  # Settings specified here will take precedence over those in config/application.rb.

  # In the development environment your application's code is reloaded any time
  # it changes. This slows down response time but is perfect for development
  # since you don't have to restart the web server when you make code changes.
  config.enable_reloading = true

  # Do not eager load code on boot.
  config.eager_load = false

  # Show full error reports.
  config.consider_all_requests_local = true

  # Enable server timing.
  config.server_timing = true

  # Enable/disable caching. By default caching is disabled.
  # Run rails dev:cache to toggle caching.
  if Rails.root.join("tmp/caching-dev.txt").exist?
    <%- unless options.api? -%>
    config.action_controller.perform_caching = true
    config.action_controller.enable_fragment_cache_logging = true

    <%- end -%>
    config.cache_store = :memory_store
    config.public_file_server.headers = { "Cache-Control" => "public, max-age=#{2.days.to_i}" }
  else
    config.action_controller.perform_caching = false

    config.cache_store = :null_store
  end
  <%- unless skip_active_storage? -%>

  # Store uploaded files on the local file system (see config/storage.yml for options).
  config.active_storage.service = :local
  <%- end -%>
  <%- unless options.skip_action_mailer? -%>

  # Don't care if the mailer can't send.
  config.action_mailer.raise_delivery_errors = false

  config.action_mailer.perform_caching = false

  config.action_mailer.default_url_options = { host: "localhost", port: 3000 }
  <%- end -%>

  # Print deprecation notices to the Rails logger.
  config.active_support.deprecation = :log

  # Raise exceptions for disallowed deprecations.
  config.active_support.disallowed_deprecation = :raise

  # Tell Active Support which deprecation messages to disallow.
  config.active_support.disallowed_deprecation_warnings = []

  <%- unless options.skip_active_record? -%>
  # Raise an error on page load if there are pending migrations.
  config.active_record.migration_error = :page_load

  # Highlight code that triggered database queries in logs.
  config.active_record.verbose_query_logs = true

  <%- end -%>
  <%- unless options[:skip_active_job] -%>
  # Highlight code that enqueued background job in logs.
  config.active_job.verbose_enqueue_logs = true

  <%- end -%>
  <%- unless skip_sprockets? -%>
  # Suppress logger output for asset requests.
  config.assets.quiet = true
  <%- end -%>

  # Raises error for missing translations.
  # config.i18n.raise_on_missing_translations = true

  # Annotate rendered view with file names.
  config.action_view.annotate_rendered_view_with_filenames = true

  <%- unless skip_action_cable? -%>
  # Uncomment if you wish to allow Action Cable access from any origin.
  # config.action_cable.disable_request_forgery_protection = true

  <%- end -%>
  # Raise error when a before_action's only/except options reference missing actions.
  config.action_controller.raise_on_missing_callback_actions = true
  <%- unless skip_rubocop? -%>

  # Apply autocorrection by RuboCop to files generated by `bin/rails generate`.
  config.generators.apply_rubocop_autocorrect_after_generate!
  <%- end -%>
end