# File lib/rails.rb, line 51
def configuration
  application.config
end

The Configuration instance used to configure the Rails environment

# File lib/rails.rb, line 74
def env
  @_env ||= ActiveSupport::EnvironmentInquirer.new(ENV["RAILS_ENV"].presence || ENV["RACK_ENV"].presence || "development")
end

Returns the current Rails environment.

Rails.env # => "development"
Rails.env.development? # => true
Rails.env.production? # => false
Rails.env.local? # => true              true for "development" and "test", false for anything else

# File lib/rails.rb, line 81
def env=(environment)
  @_env = ActiveSupport::EnvironmentInquirer.new(environment)
end

Sets the Rails environment.

Rails.env = "staging" # => "staging"

# File lib/rails.rb, line 92
def error
  ActiveSupport.error_reporter
end

Returns the ActiveSupport::ErrorReporter of the current Rails project, otherwise it returns nil if there is no project.

Rails.error.handle(IOError) do
  # ...
end
Rails.error.report(error)

# File lib/rails.rb, line 100
def event
  ActiveSupport.event_reporter
end

Returns the ActiveSupport::EventReporter of the current Rails project, otherwise it returns nil if there is no project.

Rails.event.notify("my_event", { message: "Hello, world!" })

# File lib/rails/gem_version.rb, line 5
def self.gem_version
  Gem::Version.new VERSION::STRING
end

Returns the currently loaded version of Rails as a Gem::Version.

# File lib/rails.rb, line 113
def groups(*groups)
  hash = groups.extract_options!
  env = Rails.env
  groups.unshift(:default, env)
  groups.concat ENV["RAILS_GROUPS"].to_s.split(",")
  groups.concat hash.map { |k, v| k if v.map(&:to_s).include?(env) }
  groups.compact!
  groups.uniq!
  groups
end

Returns all Rails groups for loading based on:

• The Rails environment;

• The environment variable RAILS_GROUPS;

• The optional envs given as argument and the hash with group dependencies;

Rails.groups assets: [:development, :test]
# => [:default, "development", :assets] for Rails.env == "development"
# => [:default, "production"]           for Rails.env == "production"

# File lib/rails.rb, line 129
def public_path
  application && Pathname.new(application.paths["public"].first)
end

Returns a Pathname object of the public folder of the current Rails project, otherwise it returns nil if there is no project:

Rails.public_path
  # => #<Pathname:/Users/someuser/some/path/project/public>

# File lib/rails.rb, line 64
def root
  application && application.config.root
end

Returns a Pathname object of the current Rails project, otherwise it returns nil if there is no project:

Rails.root
  # => #<Pathname:/Users/someuser/some/path/project>

# File lib/rails/version.rb, line 7
def self.version
  VERSION::STRING
end

Returns the currently loaded version of Rails as a string.