ruby-on-rails - Generator Ruby Gem 中没有用于配置的方法 'configuration'

Question

我对这个感到困惑。我最近写了一个 gem，它为 Rails 项目添加了一个生成器。我正在尝试向 gem 添加配置以设置生成器的默认值。但是，当我尝试从生成器引用模块的配置方法时，出现了 no method 'configuration' 错误。

相关代码如下:

componentize.rb

require 'rails'
require "componentize/engine"
require "componentize/version"
require "componentize/configuration"

module Componentize
  class << self
    attr_accessor :configuration
  end

  def self.configuration
    @configuration ||= Configuration.new
  end

  def self.configure
    yield(configuration)
  end

  def self.reset
    @configuration = Configuration.new
  end
end

componentize/configuration.rb

module Componentize
  class Configuration
    attr_accessor :extension, :view_partial_dir, :inline_style_partial_dir, :block_style_partial_dir, :import_file

    def initialize
      @extension = 'erb'
      @view_partial_dir = 'application'
      @inline_style_partial_dir = 'blocks'
      @block_style_partial_dir = 'sections'
      @import_file = 'base.scss'
    end
  end
end

componentize/component_generator.rb

require 'rails/generators/named_base'

module Componentize
  class ComponentGenerator < Rails::Generators::NamedBase
    # Componentize.configuration will error here.
  end
end

就其值(value)而言，如果我在我的测试中 puts Componentize.configuration.extension，它会 puts 'erb' 就像它应该的那样，所以我知道配置方法在某处可用。

spec/lib/generators/componentize/component_spec.rb

require 'fileutils'
require 'spec_helper'
require 'generator_spec'
require 'generators/componentize/component_generator'

describe Componentize::ComponentGenerator, type: :generator do
  destination File.expand_path('../tmp', __FILE__)
  arguments %w(test-component)

  before :all do
    prepare_destination
    create_tmp_dirs_and_files
    show_me_componentize
    run_generator
  end

  it "creates a view file" do
    assert_file "app/views/application/_test_component.html.erb"
  end

  it "creates an scss file" do
    assert_file "app/assets/stylesheets/blocks/_test_component.scss"
  end

  it "finds a base.scss file" do
    assert_file "app/assets/stylesheets/base.scss"
  end

  private

  def create_tmp_dirs_and_files
    FileUtils.mkdir_p('spec/lib/generators/tmp/app/assets/stylesheets')
    FileUtils.touch('spec/lib/generators/tmp/app/assets/stylesheets/base.scss')
  end

  def show_me_componentize
    puts Componentize.configuration.extension # works just fine
  end
end

有人明白为什么我会收到 no method 'configuration' 错误吗？

编辑 1

让我们来解决一下这个问题。继续写完所有将使用该配置的代码，当我运行测试时一切都通过了。因此，当测试运行时，Componentize.configuration.extension 和 Configuration 类中的任何其他 attr_accessors 都可以正常工作。我遇到的失败是当我尝试在 Rails 项目中运行 gem 的生成器时，当我删除配置时，生成器运行，当我有配置时，它给出了无方法错误。

Answer 1

好吧，首先，我觉得这有点超出我的知识范围，但我只是大胆地猜测一下。

  class << self
    attr_accessor :configuration
  end

  def self.configuration
    @configuration ||= Configuration.new
  end

也许问题与这两个 block 都将在同一 namespace 下创建配置方法有关？

此外，我正在尝试在这里运行纯 ruby​​ 进行测试，并进行了一些小的更改，但没有出现任何错误:

module Componentize
  class << self
    attr_accessor :configuration
  end

  def self.configuration
    @configuration ||= Configuration.new
  end

  def self.configure
    yield(configuration)
  end

  def self.reset
    @configuration = Configuration.new
  end

  class Configuration
    attr_accessor :extension

    def initialize
      @extension = 'erb'
    end
  end

  class ComponentGenerator # < Rails::Generators::NamedBase
    @default_extension = Componentize.configuration.extension # failure here
    # More code
  end

  ComponentGenerator.new
end