Module: Rails::Generators

Includes:
Command::Behavior
Defined in:
activejob/lib/rails/generators/job/job_generator.rb,
actionmailer/lib/rails/generators/mailer/mailer_generator.rb,
actioncable/lib/rails/generators/channel/channel_generator.rb,
actionmailbox/lib/rails/generators/mailbox/mailbox_generator.rb,
railties/lib/rails/generators.rb,
railties/lib/rails/generators/base.rb,
railties/lib/rails/generators/actions.rb,
railties/lib/rails/generators/app_base.rb,
railties/lib/rails/generators/app_name.rb,
railties/lib/rails/generators/database.rb,
railties/lib/rails/generators/migration.rb,
railties/lib/rails/generators/test_case.rb,
railties/lib/rails/generators/named_base.rb,
railties/lib/rails/generators/active_model.rb,
railties/lib/rails/generators/model_helpers.rb,
railties/lib/rails/generators/resource_helpers.rb,
railties/lib/rails/generators/testing/behaviour.rb,
railties/lib/rails/generators/testing/assertions.rb,
railties/lib/rails/generators/generated_attribute.rb,
railties/lib/rails/generators/rails/app/app_generator.rb,
railties/lib/rails/generators/actions/create_migration.rb,
railties/lib/rails/generators/rails/task/task_generator.rb,
railties/lib/rails/generators/testing/setup_and_teardown.rb,
railties/lib/rails/generators/rails/model/model_generator.rb,
railties/lib/rails/commands/application/application_command.rb,
railties/lib/rails/generators/rails/assets/assets_generator.rb,
railties/lib/rails/generators/rails/helper/helper_generator.rb,
railties/lib/rails/generators/rails/plugin/plugin_generator.rb,
railties/lib/rails/generators/rails/resource/resource_generator.rb,
railties/lib/rails/generators/rails/scaffold/scaffold_generator.rb,
railties/lib/rails/generators/rails/benchmark/benchmark_generator.rb,
railties/lib/rails/generators/rails/generator/generator_generator.rb,
railties/lib/rails/generators/rails/migration/migration_generator.rb,
railties/lib/rails/generators/rails/controller/controller_generator.rb,
railties/lib/rails/generators/rails/master_key/master_key_generator.rb,
railties/lib/rails/generators/rails/credentials/credentials_generator.rb,
railties/lib/rails/generators/rails/db/system/change/change_generator.rb,
railties/lib/rails/generators/rails/system_test/system_test_generator.rb,
railties/lib/rails/generators/rails/encrypted_file/encrypted_file_generator.rb,
railties/lib/rails/generators/rails/resource_route/resource_route_generator.rb,
railties/lib/rails/generators/rails/integration_test/integration_test_generator.rb,
railties/lib/rails/generators/rails/application_record/application_record_generator.rb,
railties/lib/rails/generators/rails/encryption_key_file/encryption_key_file_generator.rb,
railties/lib/rails/generators/rails/scaffold_controller/scaffold_controller_generator.rb

Overview

:nodoc:

Defined Under Namespace

Modules: Actions, AppName, Database, Db, Migration, ModelHelpers, ResourceHelpers, Testing Classes: ARGVScrubber, ActiveModel, AppBase, AppGenerator, ApplicationRecordGenerator, AssetsGenerator, Base, BenchmarkGenerator, ChannelGenerator, ControllerGenerator, CredentialsGenerator, EncryptedFileGenerator, EncryptionKeyFileGenerator, Error, GeneratedAttribute, GeneratorGenerator, HelperGenerator, IntegrationTestGenerator, JobGenerator, MailboxGenerator, MailerGenerator, MasterKeyGenerator, MigrationGenerator, ModelGenerator, NamedBase, PluginGenerator, ResourceGenerator, ResourceRouteGenerator, ScaffoldControllerGenerator, ScaffoldGenerator, SystemTestGenerator, TaskGenerator, TestCase

Constant Summary collapse

DEFAULT_ALIASES =
{
  rails: {
    actions: "-a",
    orm: "-o",
    javascripts: "-j",
    javascript_engine: "-je",
    resource_controller: "-c",
    scaffold_controller: "-c",
    stylesheets: "-y",
    stylesheet_engine: "-se",
    scaffold_stylesheet: "-ss",
    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,
    stylesheets: true,
    stylesheet_engine: :css,
    scaffold_stylesheet: true,
    system_tests: nil,
    test_framework: nil,
    template_engine: :erb
  }
}
RAILS_DEV_PATH =

We need to store the RAILS_DEV_PATH in a constant, otherwise the path can change in Ruby 1.8.7 when we FileUtils.cd.

File.expand_path("../../../../../..", __dir__)

Class Method Summary collapse

Methods included from ActiveSupport::Concern

#append_features, #class_methods, extended, #included, #prepend_features, #prepended

Class Method Details

.add_generated_file(file) ⇒ Object

:nodoc:


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# File 'railties/lib/rails/generators.rb', line 289

def add_generated_file(file) # :nodoc:
  (@@generated_files ||= []) << file
  file
end

.after_generate_callbacksObject

:nodoc:


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# File 'railties/lib/rails/generators.rb', line 97

def after_generate_callbacks # :nodoc:
  @after_generate_callbacks ||= []
end

.aliasesObject

:nodoc:


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# File 'railties/lib/rails/generators.rb', line 89

def aliases #:nodoc:
  @aliases ||= DEFAULT_ALIASES.dup
end

.api_only!Object

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.


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# File 'railties/lib/rails/generators.rb', line 121

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

.configure!(config) ⇒ Object

:nodoc:


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# File 'railties/lib/rails/generators.rb', line 73

def configure!(config) #:nodoc:
  api_only! if config.api_only
  no_color! unless config.colorize_logging
  aliases.deep_merge! config.aliases
  options.deep_merge! config.options
  fallbacks.merge! config.fallbacks
  templates_path.concat config.templates
  templates_path.uniq!
  hide_namespaces(*config.hidden_namespaces)
  after_generate_callbacks.replace config.after_generate_callbacks
end

.fallbacksObject

Hold configured generators fallbacks. If a plugin developer wants a generator group to fallback 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

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# File 'railties/lib/rails/generators.rb', line 113

def fallbacks
  @fallbacks ||= {}
end

.find_by_namespace(name, base = nil, context = nil) ⇒ Object

Rails finds namespaces similar to Thor, it only adds one rule:

Generators names must end with “_generator.rb”. This is required because Rails looks in load paths and loads the generator just before it's going to be used.

find_by_namespace :webrat, :rails, :integration

Will search for the following generators:

"rails:webrat", "webrat:integration", "webrat"

Notice that “rails:generators:webrat” could be loaded as well, what Rails looks for is the first and last parts of the namespace.


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# File 'railties/lib/rails/generators.rb', line 244

def find_by_namespace(name, base = nil, context = nil) #:nodoc:
  lookups = []
  lookups << "#{base}:#{name}"    if base
  lookups << "#{name}:#{context}" if context

  unless base || context
    unless name.to_s.include?(?:)
      lookups << "#{name}:#{name}"
      lookups << "rails:#{name}"
    end
    lookups << "#{name}"
  end

  lookup(lookups)

  namespaces = subclasses.index_by(&:namespace)
  lookups.each do |namespace|
    klass = namespaces[namespace]
    return klass if klass
  end

  invoke_fallbacks_for(name, base) || invoke_fallbacks_for(context, name)
end

.help(command = "generate") ⇒ Object

Show help message with available generators.


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# File 'railties/lib/rails/generators.rb', line 180

def help(command = "generate")
  puts "Usage: 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

.hidden_namespacesObject

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”, others are private to other generators such as “css:scaffold”.


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# File 'railties/lib/rails/generators.rb', line 140

def hidden_namespaces
  @hidden_namespaces ||= begin
    orm      = options[:rails][:orm]
    test     = options[:rails][:test_framework]
    template = options[:rails][:template_engine]
    css      = options[:rails][:stylesheet_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",
      "#{css}:scaffold",
      "#{css}:assets",
      "css:assets",
      "css:scaffold",
      "action_text:install",
      "action_mailbox:install"
    ]
  end
end

.hide_namespaces(*namespaces) ⇒ Object Also known as: hide_namespace


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

def hide_namespaces(*namespaces)
  hidden_namespaces.concat(namespaces)
end

.invoke(namespace, args = ARGV, config = {}) ⇒ Object

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.


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# File 'railties/lib/rails/generators.rb', line 271

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)
    suggestion  = Rails::Command::Spellchecker.suggest(namespace.to_s, from: options)
    suggestion_msg = "Maybe you meant #{suggestion.inspect}?" if suggestion

    puts <<~MSG
      Could not find generator '#{namespace}'. #{suggestion_msg}
      Run `bin/rails generate --help` for more options.
    MSG
  end
end

.optionsObject

:nodoc:


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# File 'railties/lib/rails/generators.rb', line 93

def options #:nodoc:
  @options ||= DEFAULT_OPTIONS.dup
end

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# File 'railties/lib/rails/generators.rb', line 201

def print_generators
  sorted_groups.each { |b, n| print_list(b, n) }
end

.public_namespacesObject


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# File 'railties/lib/rails/generators.rb', line 196

def public_namespaces
  lookup!
  subclasses.map(&:namespace)
end

.sorted_groupsObject


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# File 'railties/lib/rails/generators.rb', line 205

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_secrets")
  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

.templates_pathObject

:nodoc:


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# File 'railties/lib/rails/generators.rb', line 85

def templates_path #:nodoc:
  @templates_path ||= []
end