Class: Rails::Generators::Base

Relationships & Source Files
Extension / Inclusion / Inheritance Descendants
Subclasses: ActionMailbox::Generators::InstallGenerator, ActionText::Generators::InstallGenerator, ActiveRecord::Generators::ApplicationRecordGenerator, ActiveRecord::Generators::Base, ActiveRecord::Generators::MigrationGenerator, ActiveRecord::Generators::ModelGenerator, ActiveRecord::Generators::MultiDbGenerator, Erb::Generators::AuthenticationGenerator, Erb::Generators::Base, Erb::Generators::ControllerGenerator, Erb::Generators::MailerGenerator, Erb::Generators::ScaffoldGenerator, Rails::Generators::AppBase, AppGenerator, Rails::Generators::ApplicationRecordGenerator, Rails::Generators::AuthenticationGenerator, BenchmarkGenerator, ChannelGenerator, Rails::Generators::ControllerGenerator, Rails::Generators::CredentialsGenerator, Rails::Generators::DevcontainerGenerator, Rails::Generators::EncryptedFileGenerator, Rails::Generators::EncryptionKeyFileGenerator, Rails::Generators::GeneratorGenerator, Rails::Generators::HelperGenerator, Rails::Generators::IntegrationTestGenerator, Rails::Generators::JobGenerator, MailboxGenerator, MailerGenerator, Rails::Generators::MasterKeyGenerator, Rails::Generators::MigrationGenerator, Rails::Generators::ModelGenerator, NamedBase, Rails::Generators::PluginGenerator, Rails::Generators::ResourceGenerator, Rails::Generators::ResourceRouteGenerator, Rails::Generators::ScaffoldControllerGenerator, Rails::Generators::ScaffoldGenerator, ScriptGenerator, Rails::Generators::SystemTestGenerator, Rails::Generators::TaskGenerator, TestUnit::Generators::AuthenticationGenerator, TestUnit::Generators::Base, TestUnit::Generators::ChannelGenerator, TestUnit::Generators::ControllerGenerator, TestUnit::Generators::GeneratorGenerator, TestUnit::Generators::HelperGenerator, TestUnit::Generators::InstallGenerator, TestUnit::Generators::IntegrationGenerator, TestUnit::Generators::JobGenerator, TestUnit::Generators::MailboxGenerator, TestUnit::Generators::MailerGenerator, TestUnit::Generators::ModelGenerator, TestUnit::Generators::PluginGenerator, TestUnit::Generators::ScaffoldGenerator, TestUnit::Generators::SystemGenerator, Rails::Generators::Db::System::ChangeGenerator
Super Chains via Extension / Inclusion / Inheritance
Class Chain: self, Thor::Group
Instance Chain: self, `Actions`, Thor::Actions, Thor::Group
Inherits:	Thor::Group `::Object` Thor::Group Rails::Generators::Base
Defined in:	railties/lib/rails/generators/base.rb

Class Method Summary

.base_root

Returns the base root for a common set of generators.
.default_source_root

Returns the default source root for a given generator.
.desc(description = nil)

Tries to get the description from a USAGE file one folder above the source root otherwise uses a default description.
.hide!

Convenience method to hide this generator from the available ones when running rails generator command.
.hook_for(*names, &block)

Invoke a generator based on the value supplied by the user to the given option named “name”.
.namespace(name = nil)

Convenience method to get the namespace from the class name.
.remove_hook_for(*names)

Remove a previously added hook.
.source_root(path = nil)

Returns the source root for this generator using default_source_root as default.
.add_shebang_option! private

Small macro to add ruby as an option to the generator with proper default value plus an instance helper method called shebang.
.banner private

Use Rails default banner.
.base_name private

Sets the base_name taking into account the current class namespace.
.default_aliases_for_option(name, options) private

Returns default aliases for the option name given doing a lookup in aliases.
.default_for_option(config, name, options, default) private

Returns default for the option name given doing a lookup in config.
.default_generator_root private
.default_value_for_option(name, options) private

Returns the default value for the option name given doing a lookup in options.
.generator_name private

Removes the namespaces and get the generator name.
.usage_path private

Instance Attribute Summary

#namespaced? ⇒ Boolean readonly private

Instance Method Summary

#extract_last_module(nesting) private

Takes in an array of nested modules and extracts the last module.
#indent(content, multiplier = 2) private
#module_namespacing(&block) private

Wrap block with namespace of current application if namespace exists and is not skipped.
#namespace private
#namespaced_path private
#wrap_with_namespace(content) private

`Actions` - Included

#add_source	Add the given source to `Gemfile`
#application	Alias for Actions#environment.
#environment	Adds configuration code to a Rails runtime environment.
#gem	Adds a `gem` declaration to the `Gemfile` for the specified gem.
#gem_group	Wraps gem entries inside a group.
#generate	Runs another generator.
#git	Runs one or more git commands.
#github,
#initializer	Creates an initializer file in `config/initializers/`.
#lib	Creates a file in `lib/`.
#rails_command	Runs the specified Rails command.
#rake	Runs the specified Rake task.
#rakefile	Creates a Rake tasks file in `lib/tasks/`.
#readme	Reads the given file at the source root and prints it in the console.
#route	Make an entry in Rails routing file `config/routes.rb`.
#vendor	Creates a file in `vendor/`.
#execute_command	Runs the supplied command using either “rake …” or “rails …” based on the executor parameter provided.
#indentation	Indent the `Gemfile` to the depth of @indentation.
#log	Define log for backwards compatibility.
#optimize_indentation	Returns optimized string with indentation.
#quote	Always returns value in double quotes.
#with_indentation	Manage `Gemfile` indentation for a DSL action block.

Class Method Details

.add_shebang_option! (private)

Small macro to add ruby as an option to the generator with proper default value plus an instance helper method called shebang.

[ GitHub ]

# File 'railties/lib/rails/generators/base.rb', line 396


def self.add_shebang_option! # :doc:
  class_option :ruby, type: :string, aliases: "-r", default: Thor::Util.ruby_command,
                      desc: "Path to the Ruby binary of your choice", banner: "PATH"

  no_tasks {
    define_method :shebang do
      @shebang ||= begin
        command = if options[:ruby] == Thor::Util.ruby_command
          "/usr/bin/env #{File.basename(Thor::Util.ruby_command)}"
        else
          options[:ruby]
        end
        "#!#{command}"
      end
    end
  }
end

.base_name (private)

Sets the base_name taking into account the current class namespace.

[ GitHub ]

# File 'railties/lib/rails/generators/base.rb', line 334


def self.base_name # :doc:
  @base_name ||= if base = name.to_s.split("::").first
    base.underscore
  end
end

.base_root

Returns the base root for a common set of generators. This is used to dynamically guess the default source root.

[ GitHub ]

# File 'railties/lib/rails/generators/base.rb', line 236


def self.base_root
  __dir__
end

.default_aliases_for_option(name, options) (private)

Returns default aliases for the option name given doing a lookup in Rails::Generators.aliases.

[ GitHub ]

# File 'railties/lib/rails/generators/base.rb', line 357


def self.default_aliases_for_option(name, options) # :doc:
  default_for_option(Rails::Generators.aliases, name, options, options[:aliases])
end

.default_for_option(config, name, options, default) (private)

Returns default for the option name given doing a lookup in config.

[ GitHub ]

# File 'railties/lib/rails/generators/base.rb', line 362


def self.default_for_option(config, name, options, default) # :doc:
  if generator_name && (c = config[generator_name.to_sym]) && c.key?(name)
    c[name]
  elsif base_name && (c = config[base_name.to_sym]) && c.key?(name)
    c[name]
  elsif config[:rails].key?(name)
    config[:rails][name]
  else
    default
  end
end

.default_generator_root (private)

[ GitHub ]

# File 'railties/lib/rails/generators/base.rb', line 422


def self.default_generator_root # :doc:
  path = File.expand_path(File.join(base_name, generator_name), base_root)
  path if File.exist?(path)
end

.default_source_root

Returns the default source root for a given generator. This is used internally by ::Rails to set its generators source root. If you want to customize your source root, you should use source_root.

[ GitHub ]

# File 'railties/lib/rails/generators/base.rb', line 227


def self.default_source_root
  return unless base_name && generator_name
  return unless default_generator_root
  path = File.join(default_generator_root, "templates")
  path if File.exist?(path)
end

.default_value_for_option(name, options) (private)

Returns the default value for the option name given doing a lookup in Rails::Generators.options.

[ GitHub ]

# File 'railties/lib/rails/generators/base.rb', line 351


def self.default_value_for_option(name, options) # :doc:
  default_for_option(Rails::Generators.options, name, options, options[:default])
end

.desc(description = nil)

Tries to get the description from a USAGE file one folder above the source root otherwise uses a default description.

[ GitHub ]

# File 'railties/lib/rails/generators/base.rb', line 41


def self.desc(description = nil)
  return super if description

  @desc ||= if usage_path
    ERB.new(File.read(usage_path)).result(binding)
  else
    "Description:\n    Create #{base_name.humanize.downcase} files for #{generator_name} generator."
  end
end

.generator_name (private)

Removes the namespaces and get the generator name. For example, ModelGenerator will return “model” as generator name.

[ GitHub ]

# File 'railties/lib/rails/generators/base.rb', line 342


def self.generator_name # :doc:
  @generator_name ||= if generator = name.to_s.split("::").last
    generator.delete_suffix!("Generator")
    generator.underscore
  end
end

.hide!

Convenience method to hide this generator from the available ones when running rails generator command.

[ GitHub ]

# File 'railties/lib/rails/generators/base.rb', line 61


def self.hide!
  Rails::Generators.hide_namespace(namespace)
end

.hook_for(*names, &block)

Invoke a generator based on the value supplied by the user to the given option named “name”. A class option is created when this method is invoked and you can set a hash to customize it.

Examples

module Rails::Generators
  class ControllerGenerator < Base
    hook_for :test_framework, aliases: "-t"
  end
end

The example above will create a test framework option and will invoke a generator based on the user supplied value.

For example, if the user invoke the controller generator as:

$ bin/rails generate controller Account --test-framework=test_unit

The controller generator will then try to invoke the following generators:

"rails:test_unit", "test_unit:controller", "test_unit"

Notice that “rails:generators:test_unit” could be loaded as well, what Rails looks for is the first and last parts of the namespace. This is what allows any test framework to hook into Rails as long as it provides any of the hooks above.

Options

The first and last part used to find the generator to be invoked are guessed based on class invokes hook_for, as noticed in the example above. This can be customized with two options: :in and :as.

Let’s suppose you are creating a generator that needs to invoke the controller generator from test unit. Your first attempt is:

class AwesomeGenerator < Rails::Generators::Base
  hook_for :test_framework
end

The lookup in this case for test_unit as input is:

"test_unit:awesome", "test_unit"

Which is not the desired lookup. You can change it by providing the :as option:

class AwesomeGenerator < Rails::Generators::Base
  hook_for :test_framework, as: :controller
end

And now it will look up at:

"test_unit:controller", "test_unit"

Similarly, if you want it to also look up in the rails namespace, you just need to provide the :in value:

class AwesomeGenerator < Rails::Generators::Base
  hook_for :test_framework, in: :rails, as: :controller
end

And the lookup is exactly the same as previously:

"rails:test_unit", "test_unit:controller", "test_unit"

Switches

All hooks come with switches for user interface. If you do not want to use any test framework, you can do:

$ bin/rails generate controller Account --skip-test-framework

Or similarly:

$ bin/rails generate controller Account --no-test-framework

Boolean hooks

In some cases, you may want to provide a boolean hook. For example, webrat developers might want to have webrat available on controller generator. This can be achieved as:

Rails::Generators::ControllerGenerator.hook_for :webrat, type: :boolean

Then, if you want webrat to be invoked, just supply:

$ bin/rails generate controller Account --webrat

The hooks lookup is similar as above:

"rails:generators:webrat", "webrat:generators:controller", "webrat"

Custom invocations

You can also supply a block to hook_for to customize how the hook is going to be invoked. The block receives two arguments, an instance of the current class and the class to be invoked.

For example, in the resource generator, the controller should be invoked with a pluralized class name. But by default it is invoked with the same name as the resource generator, which is singular. To change this, we can give a block to customize how the controller can be invoked.

hook_for :resource_controller do |instance, controller|
  instance.invoke controller, [ instance.name.pluralize ]
end

[ GitHub ]

# File 'railties/lib/rails/generators/base.rb', line 174


def self.hook_for(*names, &block)
  options = names.extract_options!
  in_base = options.delete(:in) || base_name
  as_hook = options.delete(:as) || generator_name

  names.each do |name|
    unless class_options.key?(name)
      defaults = if options[:type] == :boolean
        {}
      elsif [true, false].include?(default_value_for_option(name, options))
        { banner: "" }
      else
        { desc: "#{name.to_s.humanize} to be invoked", banner: "NAME" }
      end

      class_option(name, defaults.merge!(options))
    end

    klass = self

    singleton_class.define_method("#{name}_generator") do
      value = class_options[name].default
      Rails::Generators.find_by_namespace(klass.generator_name, value)
    end

    hooks[name] = [ in_base, as_hook ]
    invoke_from_option(name, options, &block)
  end
end

.namespace(name = nil)

Convenience method to get the namespace from the class name. It’s the same as Thor default except that the Generator at the end of the class is removed.

[ GitHub ]

# File 'railties/lib/rails/generators/base.rb', line 54


def self.namespace(name = nil)
  return super if name
  @namespace ||= super.delete_suffix("_generator").sub(/:generators:/, ":")
end

.remove_hook_for(*names)

Remove a previously added hook.

remove_hook_for :orm

[ GitHub ]

# File 'railties/lib/rails/generators/base.rb', line 207


def self.remove_hook_for(*names)
  remove_invocation(*names)

  names.each do |name|
    singleton_class.undef_method("#{name}_generator")
    hooks.delete(name)
  end
end

.source_root(path = nil)

Returns the source root for this generator using default_source_root as default.

[ GitHub ]

# File 'railties/lib/rails/generators/base.rb', line 34


def self.source_root(path = nil)
  @_source_root = path if path
  @_source_root ||= default_source_root
end

.usage_path (private)

[ GitHub ]

# File 'railties/lib/rails/generators/base.rb', line 414


def self.usage_path # :doc:
  paths = [
    source_root && File.expand_path("../USAGE", source_root),
    default_generator_root && File.join(default_generator_root, "USAGE")
  ]
  paths.compact.detect { |path| File.exist? path }
end

Instance Attribute Details

#namespaced? ⇒ `Boolean` (readonly, private)

[ GitHub ]

# File 'railties/lib/rails/generators/base.rb', line 316


def namespaced? # :doc:
  !options[:skip_namespace] && namespace
end

Instance Method Details

#extract_last_module(nesting) (private)

Takes in an array of nested modules and extracts the last module

[ GitHub ]

# File 'railties/lib/rails/generators/base.rb', line 287


def extract_last_module(nesting) # :doc:
  nesting.inject(Object) do |last_module, nest|
    break unless last_module.const_defined?(nest, false)
    last_module.const_get(nest)
  end
end

#indent(content, multiplier = 2) (private)

[ GitHub ]

# File 'railties/lib/rails/generators/base.rb', line 302


def indent(content, multiplier = 2) # :doc:
  spaces = " " * multiplier
  content.each_line.map { |line| line.blank? ? line : "#{spaces}#{line}" }.join
end

#module_namespacing(&block) (private)

Wrap block with namespace of current application if namespace exists and is not skipped

[ GitHub ]

# File 'railties/lib/rails/generators/base.rb', line 296


def module_namespacing(&block) # :doc:
  content = capture(&block)
  content = wrap_with_namespace(content) if namespaced?
  concat(content)
end

#namespace (private)

[ GitHub ]

# File 'railties/lib/rails/generators/base.rb', line 312


def namespace # :doc:
  Rails::Generators.namespace
end

#namespaced_path (private)

[ GitHub ]

# File 'railties/lib/rails/generators/base.rb', line 324


def namespaced_path # :doc:
  @namespaced_path ||= namespace_dirs.join("/")
end

#wrap_with_namespace(content) (private)

[ GitHub ]

# File 'railties/lib/rails/generators/base.rb', line 307


def wrap_with_namespace(content) # :doc:
  content = indent(content).chomp
  "module #{namespace.name}\n#{content}\nend\n"
end

Class: Rails::Generators::Base

Class Method Summary

Instance Attribute Summary

Instance Method Summary

Actions - Included

Class Method Details

.add_shebang_option! (private)

.banner (private)

.base_name (private)

.base_root

.default_aliases_for_option(name, options) (private)

.default_for_option(config, name, options, default) (private)

.default_generator_root (private)

.default_source_root

.default_value_for_option(name, options) (private)

.desc(description = nil)

.generator_name (private)

.hide!

.hook_for(*names, &block)

Examples

Options

Switches

Boolean hooks

Custom invocations

.namespace(name = nil)

.remove_hook_for(*names)

.source_root(path = nil)

.usage_path (private)

Instance Attribute Details

#namespaced? ⇒ Boolean (readonly, private)

Instance Method Details

#extract_last_module(nesting) (private)

#indent(content, multiplier = 2) (private)

#module_namespacing(&block) (private)

#namespace (private)

#namespaced_path (private)

#wrap_with_namespace(content) (private)

`Actions` - Included

#namespaced? ⇒ `Boolean` (readonly, private)