Question

我遵循第3章的Hartl书，我们从静态页面开始。我们被告知：

$ git checkout -b static-pages

没有问题。然后，我们被告知要执行命令：

$ rails generate controller StaticPages home help --no-test-framework

当我这样做时，我在命令行中得到了这个：

sample_app/config/application.rb:31:in `<top (required)>': undefined local variable or method `config' for main:Object (NameError)
from /Users/NormalUse/.rvm/gems/ruby-2.0.0-p451@railstutorial_rails_4_0/gems/railties-4.0.5/lib/rails/commands.rb:43:in `require'
from /Users/NormalUse/.rvm/gems/ruby-2.0.0-p451@railstutorial_rails_4_0/gems/railties-4.0.5/lib/rails/commands.rb:43:in `<top (required)>'
from bin/rails:8:in `require'
from bin/rails:8:in `<main>'

config/application.rb:31的第31行是：

config.assets.initialize_on_precompile = false

由于Heroku问题，我添加了

。我尝试取出那条线，然后再犯了大约50个错误。

这是我们应该使用的gemfile

source 'https://rubygems.org'
ruby '2.0.0'
#ruby-gemset=railstutorial_rails_4_0
gem 'rails', '4.0.5'

group :development, :test do
gem 'sqlite3', '1.3.8'
gem 'rspec-rails', '2.13.1'
end

group :test do
gem 'selenium-webdriver', '2.35.1'
gem 'capybara', '2.1.0'
end

gem 'sass-rails', '4.0.1'
gem 'uglifier', '2.1.1'
gem 'coffee-rails', '4.0.1'
gem 'jquery-rails', '3.0.4'
gem 'turbolinks', '1.1.1'
gem 'jbuilder', '1.0.2'


group :doc do
gem 'sdoc', '0.3.20', require: false
end

group :production do
gem 'pg', '0.15.1'
gem 'rails_12factor', '0.0.2'
end

这是完整的application.rb文件：

require File.expand_path('../boot', __FILE__)

# Pick the frameworks you want:
require "active_model/railtie"
require "active_record/railtie"
require "action_controller/railtie"
require "action_mailer/railtie"
require "action_view/railtie"
require "sprockets/railtie"
#require "rails/test_unit/railtie"

# Require the gems listed in Gemfile, including any gems
# you've limited to :test, :development, or :production.
Bundler.require(*Rails.groups)

module SampleApp
class Application < Rails::Application
# Settings in config/environments/* take precedence over those specified here.
# Application configuration should go into files in config/initializers
# -- all .rb files in that directory are automatically loaded.

# Set Time.zone default to the specified zone and make Active Record auto-convert to     this zone.
# Run "rake -D time" for a list of tasks for finding time zone names. Default is UTC.
# config.time_zone = 'Central Time (US & Canada)'

# The default locale is :en and all translations from config/locales/*.rb,yml are auto  loaded.
# config.i18n.load_path += Dir[Rails.root.join('my', 'locales', '*.{rb,yml}').to_s]
# config.i18n.default_locale = :de
end
end
config.assets.initialize_on_precompile = false

我可以尝试任何想法吗？

编辑：将这个：config.assets.initialize_on_precompile = false移到课堂上，如下所示，我收到了很多错误！

以下是前5行错误：/Users/NormalUse/ror/sample_app/config/environments/development.rb:1:in `<top (required)>': undefined method `configure' for #<SampleApp::Application:0x007fa2178a73a0> (NoMethodError) from /Users/NormalUse/.rvm/gems/ruby-2.0.0-p451@railstutorial_rails_4_0/gems/activesupport-4.0.5/lib/active_support/dependencies.rb:229:in `require' from /Users/NormalUse/.rvm/gems/ruby-2.0.0-p451@railstutorial_rails_4_0/gems/activesupport-4.0.5/lib/active_support/dependencies.rb:229:in `block in require' from /Users/NormalUse/.rvm/gems/ruby-2.0.0-p451@railstutorial_rails_4_0/gems/activesupport-4.0.5/lib/active_support/dependencies.rb:214:in `load_dependency' from /Users/NormalUse/.rvm/gems/ruby-2.0.0-p451@railstutorial_rails_4_0/gems/activesupport-4.0.5/lib/active_support/dependencies.rb:229:in `require' from /Users/NormalUse/.rvm/gems/ruby-2.0.0-p451@railstutorial_rails_4_0/gems/railties-4.0.5/lib/rails/engine.rb:591:in `block (2 levels) in <class:Engine>'

编辑编辑：我只想对那些帮助我的人表示非常感谢。我无法想象它是多么艰难和沮丧，它可以帮助我们这些真正属于这一切的人。我现在正在巡航，我们已经确定两个不同安装版本的Rails是冲突的。

Answer 1

晚会，但我（希望！）来了答案：你几乎肯定安装了Rails 4.1和Rails 4.0。您遇到问题的格式对于Rails 4.1是正确的，并且将由Rails 4.1生成。

您可以通过运行gem list --local rails验证安装了哪些版本。

所以你已经检查并看到你安装了两个版本。现在怎么办？你必须卸载吗？

都能跟得上！生成新项目时，只需指定包含在下划线中的版本号：

rails _4.0.5_ new my_awesome_project

如果没有指定版本号，它将使用最新版本 - 因此您完全有效的Rails 4.1项目在您更换Gemfile时会突然中断。

Answer 2

如果你把它放在课堂内怎么办？

module SampleApp
  class Application < Rails::Application
    config.assets.initialize_on_precompile = false
  end
end

Answer 3

尝试使用：

gem 'rails', '4.0.4'

我实际上已经跳过了installed all the gems for the entire thing，这节省了我的时间。

Answer 4

好的，我的config / environments / development.rb文件中的Rails.application.configure do看起来需要更改为：SampleApp::Application.configure do。感谢this question and answer

Rails Hartl课程：未定义的局部变量或方法

4 个答案: