Rails::Generators

Namespace

Module

Class

Methods

api_only!
command_type
fallbacks
file_lookup_paths
help
hidden_namespaces
hide_namespace
hide_namespaces
invoke
lookup_paths
print_generators
print_list
public_namespaces
sorted_groups

Constants

DEFAULT_ALIASES	=	{ rails: { actions: "-a", orm: "-o", javascripts: ["-j", "--js"], resource_controller: "-c", scaffold_controller: "-c", stylesheets: "-y", template_engine: "-e", test_framework: "-t" }, test_unit: { fixture_replacement: "-r", } }
DEFAULT_OPTIONS	=	{ rails: { api: false, assets: true, force_plural: false, helper: true, integration_tool: nil, orm: false, resource_controller: :controller, resource_route: true, scaffold_controller: :scaffold_controller, system_tests: nil, test_framework: nil, template_engine: :erb } }

Class Public methods

api_only!()

Configure generators for API only applications. It basically hides everything that is usually browser related, such as assets and session migration generators, and completely disable helpers and assets so generators such as scaffold won’t create them.

📝 Source code

# File railties/lib/rails/generators.rb, line 116
      def api_only!
        hide_namespaces "assets", "helper", "css", "js"

        options[:rails].merge!(
          api: true,
          assets: false,
          helper: false,
          template_engine: nil
        )

        options[:mailer] ||= {}
        options[:mailer][:template_engine] ||= :erb
      end

🔎 See on GitHub

fallbacks()

Hold configured generators fallbacks. If a plugin developer wants a generator group to fall back to another group in case of missing generators, they can add a fallback.

For example, shoulda is considered a test_framework and is an extension of test_unit. However, most part of shoulda generators are similar to test_unit ones.

Shoulda then can tell generators to search for test_unit generators when some of them are not available by adding a fallback:

Rails::Generators.fallbacks[:shoulda] = :test_unit

📝 Source code

# File railties/lib/rails/generators.rb, line 108
      def fallbacks
        @fallbacks ||= {}
      end

🔎 See on GitHub

help(command = "generate")

Show help message with available generators.

📝 Source code

# File railties/lib/rails/generators.rb, line 170
      def help(command = "generate")
        puts "Usage:"
        puts "  bin/rails #{command} GENERATOR [args] [options]"
        puts
        puts "General options:"
        puts "  -h, [--help]     # Print generator's options and usage"
        puts "  -p, [--pretend]  # Run but do not make any changes"
        puts "  -f, [--force]    # Overwrite files that already exist"
        puts "  -s, [--skip]     # Skip files that already exist"
        puts "  -q, [--quiet]    # Suppress status output"
        puts
        puts "Please choose a generator below."
        puts

        print_generators
      end

🔎 See on GitHub

hidden_namespaces()

Returns an array of generator namespaces that are hidden. Generator namespaces may be hidden for a variety of reasons. Some are aliased such as “rails:migration” and can be invoked with the shorter “migration”.

📝 Source code

# File railties/lib/rails/generators.rb, line 134
      def hidden_namespaces
        @hidden_namespaces ||= begin
          orm      = options[:rails][:orm]
          test     = options[:rails][:test_framework]
          template = options[:rails][:template_engine]

          [
            "rails",
            "resource_route",
            "#{orm}:migration",
            "#{orm}:model",
            "#{test}:controller",
            "#{test}:helper",
            "#{test}:integration",
            "#{test}:system",
            "#{test}:mailer",
            "#{test}:model",
            "#{test}:scaffold",
            "#{test}:view",
            "#{test}:job",
            "#{template}:controller",
            "#{template}:scaffold",
            "#{template}:mailer",
            "action_text:install",
            "action_mailbox:install",
            "devcontainer"
          ]
        end
      end

🔎 See on GitHub

hide_namespace(*namespaces)

Alias for: hide_namespaces

hide_namespaces(*namespaces)

Also aliased as: hide_namespace

📝 Source code

# File railties/lib/rails/generators.rb, line 164
      def hide_namespaces(*namespaces)
        hidden_namespaces.concat(namespaces)
      end

🔎 See on GitHub

invoke(namespace, args = ARGV, config = {})

Receives a namespace, arguments, and the behavior to invoke the generator. It’s used as the default entry point for generate, destroy, and update commands.

📝 Source code

# File railties/lib/rails/generators.rb, line 261
      def invoke(namespace, args = ARGV, config = {})
        names = namespace.to_s.split(":")
        if klass = find_by_namespace(names.pop, names.any? && names.join(":"))
          args << "--help" if args.empty? && klass.arguments.any?(&:required?)
          klass.start(args, config)
          run_after_generate_callback if config[:behavior] == :invoke
        else
          options = sorted_groups.flat_map(&:last)
          error = Command::CorrectableNameError.new("Could not find generator '#{namespace}'.", namespace, options)

          puts <<~MSG
            #{error.detailed_message}
            Run `bin/rails generate --help` for more options.
          MSG
          exit 1
        end
      end

🔎 See on GitHub

print_generators()

📝 Source code

# File railties/lib/rails/generators.rb, line 192
      def print_generators
        sorted_groups.each { |b, n| print_list(b, n) }
      end

🔎 See on GitHub

public_namespaces()

📝 Source code

# File railties/lib/rails/generators.rb, line 187
      def public_namespaces
        lookup!
        subclasses.map(&:namespace)
      end

🔎 See on GitHub

sorted_groups()

📝 Source code

# File railties/lib/rails/generators.rb, line 196
      def sorted_groups
        namespaces = public_namespaces
        namespaces.sort!

        groups = Hash.new { |h, k| h[k] = [] }
        namespaces.each do |namespace|
          base = namespace.split(":").first
          groups[base] << namespace
        end

        rails = groups.delete("rails")
        rails.map! { |n| n.delete_prefix("rails:") }
        rails.delete("app")
        rails.delete("plugin")
        rails.delete("encrypted_file")
        rails.delete("encryption_key_file")
        rails.delete("master_key")
        rails.delete("credentials")
        rails.delete("db:system:change")

        hidden_namespaces.each { |n| groups.delete(n.to_s) }

        [[ "rails", rails ]] + groups.sort.to_a
      end

🔎 See on GitHub

Class Private methods

command_type()

📝 Source code

# File railties/lib/rails/generators.rb, line 306
        def command_type # :doc:
          @command_type ||= "generator"
        end

🔎 See on GitHub

file_lookup_paths()

📝 Source code

# File railties/lib/rails/generators.rb, line 314
        def file_lookup_paths # :doc:
          @file_lookup_paths ||= [ "{#{lookup_paths.join(',')}}", "**", "*_generator.rb" ]
        end

🔎 See on GitHub

lookup_paths()

📝 Source code

# File railties/lib/rails/generators.rb, line 310
        def lookup_paths # :doc:
          @lookup_paths ||= %w( rails/generators generators )
        end

🔎 See on GitHub

print_list(base, namespaces)

📝 Source code

# File railties/lib/rails/generators.rb, line 285
        def print_list(base, namespaces) # :doc:
          namespaces = namespaces.reject { |n| hidden_namespaces.include?(n) }
          super
        end

🔎 See on GitHub