为 Rails 3 插件生成测试路由时出错？

Question

我正在尝试为插件“foobar”开发测试，该插件修改了一些标准 Rails 助手。在vendor/plugins/foobar/test/foobar_test.rb中，我有以下内容：

# create the test model
class Thing < ActiveRecord::Base
end

# create the test controller, which renders the included index template
class ThingsController < ActionController::Base
  def index
    @things = Thing.all
    format.html { render(:file => 'index') }
  end

  def destroy
    @thing = Thing.find(params[:id])
    @thing.destroy
    format.html { render(:file => 'index') }
  end
end

# confirm that the test environment is working correctly
class ThingsTest < ActiveSupport::TestCase
  test "model is loaded correctly" do
    assert_kind_of Thing, Thing.new
  end
end

# confirm that the controller and routes are working correctly
class ThingsControllerTest < ActionController::TestCase
  test "should load index" do
    with_routing do |set|
      set.draw do
        resources :things, :only => [:index, :destroy]
      end

      get :index
      assert_response :success
    end
  end
end

当我运行rake时，我得到以下输出：

test_should_load_index(ThingsControllerTest):
NameError: undefined local variable or method `_routes' for ThingsController:Class

知道我做错了什么导致我无法访问路由吗？我已经研究了好几天并搜索了很多文档，但无济于事。感谢您的帮助！

Answer 1

我通过遵循 "创建的基础知识，在 Rails 3.1.0.rc1 和 Ruby 1.9.2 上工作Rails 插件” Rails 指南，并在代码因不兼容而崩溃时更正代码。

我首先运行：

Code$ rails new tester
Code$ cd tester
tester$ rails generate plugin foobar --with-generator

然后修改生成的代码以获取除了默认文件之外的这些文件：

# vendor/plugins/foobar/init.rb
require 'foobar'

---

# vendor/plugins/foobar/lib/foobar.rb

%w{ models controllers helpers }.each do |dir|
  path = File.join(File.dirname(__FILE__), 'app', dir)
  $LOAD_PATH << path
  ActiveSupport::Dependencies.autoload_paths << path
  ActiveSupport::Dependencies.autoload_once_paths.delete(path)
end

# I'm not entirely sure this is the best way to add our plugin's views
# to the view search path, but it works
ActionController::Base.view_paths = 
  ActionController::Base.view_paths + 
  [ File.join(File.dirname(__FILE__), 'app', 'views') ]

---

<!-- vendor/plugins/foobar/lib/app/views/things/index.html.erb -->
<h1>Listing things</h1>

<table>
  <tr>
    <th>Name</th>
    <th></th>
  </tr>

<% @things.each do |thing| %>
  <tr>
    <td><%= thing.name %></td>
    <td><%= link_to 'Destroy', thing, confirm: 'Are you sure?', method: :delete %></td>
  </tr>
<% end %>
</table>

---

# vendor/plugins/foobar/test/database.yml

sqlite:
  :adapter: sqlite
  :dbfile: vendor/plugins/foobar/test/foobar_plugin.sqlite.db

sqlite3:
  :adapter: sqlite3
  :database: vendor/plugins/foobar/test/foobar_plugin.sqlite3.db

postgresql:
  :adapter: postgresql
  :username: postgres
  :password: postgres
  :database: foobar_plugin_test
  :min_messages: ERROR

mysql:
  :adapter: mysql
  :host: localhost
  :username: root
  :password: password
  :database: foobar_plugin_test

---

# vendor/plugins/foobar/test/schema.rb

ActiveRecord::Schema.define(:version => 0) do
  create_table :things, :force => true do |t|
    t.string :name
    t.datetime :created_at
    t.datetime :updated_at
  end
end

---

# vendor/plugins/foobar/test/test_helper.rb

ENV['RAILS_ENV'] = 'test'
ENV['RAILS_ROOT'] ||= File.dirname(__FILE__) + '/../../../..'

require 'test/unit'
require File.expand_path(File.join(ENV['RAILS_ROOT'], 'config/environment.rb'))

def load_schema
  config = YAML::load(IO.read(File.dirname(__FILE__) + '/database.yml'))
  ActiveRecord::Base.logger = Logger.new(File.dirname(__FILE__) + "/debug.log")

  db_adapter = ENV['DB']

  # no db passed, try one of these fine config-free DBs before bombing.
  db_adapter ||=
    begin
      require 'rubygems'
      require 'sqlite'
      'sqlite'
    rescue MissingSourceFile
      begin
        require 'sqlite3'
        'sqlite3'
      rescue MissingSourceFile
      end
    end

  if db_adapter.nil?
    raise "No DB Adapter selected. Pass the DB= option to pick one, or install Sqlite or Sqlite3."
  end

  ActiveRecord::Base.establish_connection(config[db_adapter])
  load(File.dirname(__FILE__) + "/schema.rb")
  require File.dirname(__FILE__) + '/../init'
end

load_schema

---

# vendor/plugins/foobar/test/foobar_test.rb
require File.dirname(__FILE__) + '/test_helper' 

# create the test model
class Thing < ActiveRecord::Base
end

# create the test controller, which renders the included index template
class ThingsController < ActionController::Base
  def index
    @things = Thing.all
    respond_to do |format|
      format.html # index.html.erb
    end
  end

  def destroy
    @thing = Thing.find(params[:id])
    @thing.destroy
    respond_to do |format|
      format.html { redirect_to things_url }
    end
  end
end

# confirm that the test environment is working correctly
class ThingsTest < ActiveSupport::TestCase
  test "schema has loaded correctly" do
    assert_equal [], Thing.all
  end

  test "model is loaded correctly" do
    assert_kind_of Thing, Thing.new
  end
end

# confirm that the controller and routes are working correctly
class ThingsControllerTest < ActionController::TestCase
  test "should load index" do
    with_routing do |set|
      set.draw do
        resources :things, :only => [:index, :destroy]
      end

      get :index
      assert_response :success
    end
  end
end

最后，我们的测试通过：

tester$ cd vendor/plugins/foobar/
foobar$ rake
-- create_table(:things, {:force=>true})
   -> 0.0059s
-- initialize_schema_migrations_table()
   -> 0.0002s
-- assume_migrated_upto_version(0, ["db/migrate"])
   -> 0.0003s
Loaded suite /Users/nick/.rvm/gems/ruby-1.9.2-p0/gems/rake-0.9.2/lib/rake/rake_test_loader
Started
...
Finished in 0.091642 seconds.

3 tests, 3 assertions, 0 failures, 0 errors, 0 skips

Answer 2

调试此问题的最佳选择是这样做，

rake <task> --trace

这将使您更好地了解导致 _routes 错误的原因（即行号）。