Methods

Instance Public methods

add_source(source, options = {}, &block)

Add the given source to Gemfile

If block is given, gem entries in block are wrapped into the source group.

add_source "http://gems.github.com/"

add_source "http://gems.github.com/" do
  gem "rspec-rails"
end
πŸ“ Source code 
# File railties/lib/rails/generators/actions.rb, line 151
      def add_source(source, options = {}, &block)
        log :source, source

        in_root do
          if block
            append_file_with_newline "Gemfile", "\nsource #{quote(source)} do", force: true
            with_indentation(&block)
            append_file_with_newline "Gemfile", "end", force: true
          else
            prepend_file "Gemfile", "source #{quote(source)}\n", verbose: false
          end
        end
      end
πŸ”Ž See on GitHub

application(data = nil, options = {})

Alias for: environment

environment(data = nil, options = {})

Adds configuration code to a Rails runtime environment.

By default, adds code inside the Application class in config/application.rb so that it applies to all environments.

environment %(config.asset_host = "cdn.provider.com")

Results in:

# config/application.rb
class Application < Rails::Application
  config.asset_host = "cdn.provider.com"
  # ...
end

If the :env option is specified, the code will be added to the corresponding file in config/environments instead.

environment %(config.asset_host = "localhost:3000"), env: "development"

Results in:

# config/environments/development.rb
Rails.application.configure do
  config.asset_host = "localhost:3000"
  # ...
end

:env can also be an array. In which case, the code is added to each corresponding file in config/environments.

The code can also be specified as the return value of the block:

environment do
  %(config.asset_host = "cdn.provider.com")
end

environment(nil, env: "development") do
  %(config.asset_host = "localhost:3000")
end
Also aliased as: application
πŸ“ Source code 
# File railties/lib/rails/generators/actions.rb, line 206
      def environment(data = nil, options = {})
        sentinel = "class Application < Rails::Application\n"
        env_file_sentinel = "Rails.application.configure do\n"
        data ||= yield if block_given?

        in_root do
          if options[:env].nil?
            inject_into_file "config/application.rb", optimize_indentation(data, 4), after: sentinel, verbose: false
          else
            Array(options[:env]).each do |env|
              inject_into_file "config/environments/#{env}.rb", optimize_indentation(data, 2), after: env_file_sentinel, verbose: false
            end
          end
        end
      end
πŸ”Ž See on GitHub

gem(*args)

Adds a gem declaration to the Gemfile for the specified gem.

gem "rspec", group: :test
gem "technoweenie-restful-authentication", lib: "restful-authentication", source: "http://gems.github.com/"
gem "rails", "3.0", git: "https://github.com/rails/rails"
gem "RedCloth", ">= 4.1.0", "< 4.2.0"
gem "rspec", comment: "Put this comment above the gem declaration"

Note that this method only adds the gem to the Gemfile; it does not install the gem.

Options

:version

The version constraints for the gem, specified as a string or an array of strings:

gem "my_gem", version: "~> 1.1"
gem "my_gem", version: [">= 1.1", "< 2.0"]

Alternatively, can be specified as one or more arguments following the gem name:

gem "my_gem", ">= 1.1", "< 2.0"
:comment

Outputs a comment above the gem declaration in the Gemfile.

gem "my_gem", comment: "First line.\nSecond line."

Outputs:

# First line.
# Second line.
gem "my_gem"
:group

The gem group in the Gemfile that the gem belongs to.

:git

The URL of the git repository for the gem.

Any additional options passed to this method will be appended to the gem declaration in the Gemfile. For example:

gem "my_gem", comment: "Edge my_gem", git: "https://example.com/my_gem.git", branch: "master"

Outputs:

# Edge my_gem
gem "my_gem", git: "https://example.com/my_gem.git", branch: "master"
πŸ“ Source code 
# File railties/lib/rails/generators/actions.rb, line 67
      def gem(*args)
        options = args.extract_options!
        name, *versions = args

        # Set the message to be shown in logs. Uses the git repo if one is given,
        # otherwise use name (version).
        parts, message = [ quote(name) ], name.dup

        # Output a comment above the gem declaration.
        comment = options.delete(:comment)

        if versions = versions.any? ? versions : options.delete(:version)
          _versions = Array(versions)
          _versions.each do |version|
            parts << quote(version)
          end
          message << " (#{_versions.join(", ")})"
        end
        message = options[:git] if options[:git]

        log :gemfile, message

        parts << quote(options) unless options.empty?

        in_root do
          str = []
          if comment
            comment.each_line do |comment_line|
              str << indentation
              str << "# #{comment_line}"
            end
            str << "\n"
          end
          str << indentation
          str << "gem #{parts.join(", ")}"
          append_file_with_newline "Gemfile", str.join, verbose: false
        end
      end
πŸ”Ž See on GitHub

gem_group(*names, &block)

Wraps gem entries inside a group.

gem_group :development, :test do
  gem "rspec-rails"
end
πŸ“ Source code 
# File railties/lib/rails/generators/actions.rb, line 111
      def gem_group(*names, &block)
        options = names.extract_options!
        str = names.map(&:inspect)
        str << quote(options) unless options.empty?
        str = str.join(", ")
        log :gemfile, "group #{str}"

        in_root do
          append_file_with_newline "Gemfile", "\ngroup #{str} do", force: true
          with_indentation(&block)
          append_file_with_newline "Gemfile", "end", force: true
        end
      end
πŸ”Ž See on GitHub

generate(what, *args)

Runs another generator.

generate "scaffold", "Post title:string body:text"
generate "scaffold", "Post", "title:string", "body:text"

The first argument is the generator name, and the remaining arguments are joined together and passed to the generator.

πŸ“ Source code 
# File railties/lib/rails/generators/actions.rb, line 332
      def generate(what, *args)
        log :generate, what

        options = args.extract_options!
        options[:abort_on_failure] = !options[:inline]

        rails_command "generate #{what} #{args.join(" ")}", options
      end
πŸ”Ž See on GitHub

git(commands = {})

Runs one or more git commands.

git :init
# => runs `git init`

git add: "this.file that.rb"
# => runs `git add this.file that.rb`

git commit: "-m 'First commit'"
# => runs `git commit -m 'First commit'`

git add: "good.rb", rm: "bad.cxx"
# => runs `git add good.rb; git rm bad.cxx`
πŸ“ Source code 
# File railties/lib/rails/generators/actions.rb, line 237
      def git(commands = {})
        if commands.is_a?(Symbol)
          run "git #{commands}"
        else
          commands.each do |cmd, options|
            run "git #{cmd} #{options}"
          end
        end
      end
πŸ”Ž See on GitHub

github(repo, options = {}, &block)

πŸ“ Source code 
# File railties/lib/rails/generators/actions.rb, line 125
      def github(repo, options = {}, &block)
        str = [quote(repo)]
        str << quote(options) unless options.empty?
        str = str.join(", ")
        log :github, "github #{str}"

        in_root do
          if @indentation.zero?
            append_file_with_newline "Gemfile", "\ngithub #{str} do", force: true
          else
            append_file_with_newline "Gemfile", "#{indentation}github #{str} do", force: true
          end
          with_indentation(&block)
          append_file_with_newline "Gemfile", "#{indentation}end", force: true
        end
      end
πŸ”Ž See on GitHub

initializer(filename, data = nil)

Creates an initializer file in config/initializers/. The code can be specified as an argument or as the return value of the block.

initializer "api.rb", <<~RUBY
  API_KEY = "123456"
RUBY

initializer "api.rb" do
  %(API_KEY = "123456")
end
πŸ“ Source code 
# File railties/lib/rails/generators/actions.rb, line 319
      def initializer(filename, data = nil)
        log :initializer, filename
        data ||= yield if block_given?
        create_file("config/initializers/#{filename}", optimize_indentation(data), verbose: false)
      end
πŸ”Ž See on GitHub

lib(filename, data = nil)

Creates a file in lib/. The contents can be specified as an argument or as the return value of the block.

lib "foreign.rb", <<~RUBY
  # Foreign code is fun
RUBY

lib "foreign.rb" do
  "# Foreign code is fun"
end
πŸ“ Source code 
# File railties/lib/rails/generators/actions.rb, line 275
      def lib(filename, data = nil)
        log :lib, filename
        data ||= yield if block_given?
        create_file("lib/#{filename}", optimize_indentation(data), verbose: false)
      end
πŸ”Ž See on GitHub

rails_command(command, options = {})

Runs the specified Rails command.

rails_command "db:migrate"
rails_command "db:migrate", env: "production"
rails_command "db:migrate", abort_on_failure: true
rails_command "stats", capture: true
rails_command "gems:install", sudo: true

Options

:env

The Rails environment in which to run the command. Defaults to ENV["RAILS_ENV"] || "development".

:abort_on_failure

Whether to halt the generator if the command exits with a non-success exit status.

:capture

Whether to capture and return the output of the command.

:sudo

Whether to run the command using sudo.

πŸ“ Source code 
# File railties/lib/rails/generators/actions.rb, line 391
      def rails_command(command, options = {})
        if options[:inline]
          log :rails, command
          command, *args = Shellwords.split(command)
          in_root do
            silence_warnings do
              ::Rails::Command.invoke(command, args, **options)
            end
          end
        else
          execute_command :rails, command, options
        end
      end
πŸ”Ž See on GitHub

rake(command, options = {})

Runs the specified Rake task.

rake "db:migrate"
rake "db:migrate", env: "production"
rake "db:migrate", abort_on_failure: true
rake "stats", capture: true
rake "gems:install", sudo: true

Options

:env

The Rails environment in which to run the task. Defaults to ENV["RAILS_ENV"] || "development".

:abort_on_failure

Whether to halt the generator if the task exits with a non-success exit status.

:capture

Whether to capture and return the output of the task.

:sudo

Whether to run the task using sudo.

πŸ“ Source code 
# File railties/lib/rails/generators/actions.rb, line 364
      def rake(command, options = {})
        execute_command :rake, command, options
      end
πŸ”Ž See on GitHub

rakefile(filename, data = nil)

Creates a Rake tasks file in lib/tasks/. The code can be specified as an argument or as the return value of the block.

rakefile "bootstrap.rake", <<~RUBY
  task :bootstrap do
    puts "Boots! Boots! Boots!"
  end
RUBY

rakefile "bootstrap.rake" do
  project = ask("What is the UNIX name of your project?")

  <<~RUBY
    namespace :#{project} do
      task :bootstrap do
        puts "Boots! Boots! Boots!"
      end
    end
  RUBY
end
πŸ“ Source code 
# File railties/lib/rails/generators/actions.rb, line 302
      def rakefile(filename, data = nil)
        log :rakefile, filename
        data ||= yield if block_given?
        create_file("lib/tasks/#{filename}", optimize_indentation(data), verbose: false)
      end
πŸ”Ž See on GitHub

readme(path)

Reads the given file at the source root and prints it in the console.

readme "README"
πŸ“ Source code 
# File railties/lib/rails/generators/actions.rb, line 442
      def readme(path)
        log File.read(find_in_source_paths(path))
      end
πŸ”Ž See on GitHub

route(routing_code, namespace: nil)

Make an entry in Rails routing file config/routes.rb

route "root 'welcome#index'"
route "root 'admin#index'", namespace: :admin
πŸ“ Source code 
# File railties/lib/rails/generators/actions.rb, line 409
      def route(routing_code, namespace: nil)
        namespace = Array(namespace)
        namespace_pattern = route_namespace_pattern(namespace)
        routing_code = namespace.reverse.reduce(routing_code) do |code, name|
          "namespace :#{name} do\n#{rebase_indentation(code, 2)}end"
        end

        log :route, routing_code

        in_root do
          if namespace_match = match_file("config/routes.rb", namespace_pattern)
            base_indent, *, existing_block_indent = namespace_match.captures.compact.map(&:length)
            existing_line_pattern = /^[ ]{,#{existing_block_indent}}\S.+\n?/
            routing_code = rebase_indentation(routing_code, base_indent + 2).gsub(existing_line_pattern, "")
            namespace_pattern = /#{Regexp.escape namespace_match.to_s}/
          end

          inject_into_file "config/routes.rb", routing_code, after: namespace_pattern, verbose: false, force: false

          if behavior == :revoke && namespace.any? && namespace_match
            empty_block_pattern = /(#{namespace_pattern})((?:\s*end\n){1,#{namespace.size}})/
            gsub_file "config/routes.rb", empty_block_pattern, verbose: false, force: true do |matched|
              beginning, ending = empty_block_pattern.match(matched).captures
              ending.sub!(/\A\s*end\n/, "") while !ending.empty? && beginning.sub!(/^[ ]*namespace .+ do\n\s*\z/, "")
              beginning + ending
            end
          end
        end
      end
πŸ”Ž See on GitHub

vendor(filename, data = nil)

Creates a file in vendor/. The contents can be specified as an argument or as the return value of the block.

vendor "foreign.rb", <<~RUBY
  # Foreign code is fun
RUBY

vendor "foreign.rb" do
  "# Foreign code is fun"
end
πŸ“ Source code 
# File railties/lib/rails/generators/actions.rb, line 258
      def vendor(filename, data = nil)
        log :vendor, filename
        data ||= yield if block_given?
        create_file("vendor/#{filename}", optimize_indentation(data), verbose: false)
      end
πŸ”Ž See on GitHub

Instance Private methods

execute_command(executor, command, options = {})

Runs the supplied command using either β€œrake …” or β€œrails …” based on the executor parameter provided.

πŸ“ Source code 
# File railties/lib/rails/generators/actions.rb, line 461
        def execute_command(executor, command, options = {}) # :doc:
          log executor, command
          sudo = options[:sudo] && !Gem.win_platform? ? "sudo " : ""
          config = {
            env: { "RAILS_ENV" => (options[:env] || ENV["RAILS_ENV"] || "development") },
            verbose: false,
            capture: options[:capture],
            abort_on_failure: options[:abort_on_failure],
          }

          in_root { run("#{sudo}#{Shellwords.escape Gem.ruby} bin/#{executor} #{command}", config) }
        end
πŸ”Ž See on GitHub

indentation()

Indent the Gemfile to the depth of @indentation

πŸ“ Source code 
# File railties/lib/rails/generators/actions.rb, line 494
        def indentation # :doc:
          "  " * @indentation
        end
πŸ”Ž See on GitHub

log(*args)

Define log for backwards compatibility. If just one argument is sent, invoke say, otherwise invoke say_status. Differently from say and similarly to say_status, this method respects the quiet? option given.

πŸ“ Source code 
# File railties/lib/rails/generators/actions.rb, line 450
        def log(*args) # :doc:
          if args.size == 1
            say args.first.to_s unless options.quiet?
          else
            args << (behavior == :invoke ? :green : :red)
            say_status(*args)
          end
        end
πŸ”Ž See on GitHub

optimize_indentation(value, amount = 0)

Returns optimized string with indentation

Also aliased as: rebase_indentation
πŸ“ Source code 
# File railties/lib/rails/generators/actions.rb, line 487
        def optimize_indentation(value, amount = 0) # :doc:
          return "#{value}\n" unless value.is_a?(String)
          "#{value.strip_heredoc.indent(amount).chomp}\n"
        end
πŸ”Ž See on GitHub

quote(value)

Always returns value in double quotes.

πŸ“ Source code 
# File railties/lib/rails/generators/actions.rb, line 475
        def quote(value) # :doc:
          if value.respond_to? :each_pair
            return value.map do |k, v|
              "#{k}: #{quote(v)}"
            end.join(", ")
          end
          return value.inspect unless value.is_a? String

          "\"#{value.tr("'", '"')}\""
        end
πŸ”Ž See on GitHub

with_indentation(&block)

Manage Gemfile indentation for a DSL action block

πŸ“ Source code 
# File railties/lib/rails/generators/actions.rb, line 499
        def with_indentation(&block) # :doc:
          @indentation += 1
          instance_eval(&block)
        ensure
          @indentation -= 1
        end
πŸ”Ž See on GitHub