Ruby 在Rails 5控制台中运行帮助程序

我正在尝试在rails控制台中测试一些助手

我读过一篇描述一些技巧的文章

在我的第一次尝试中，我开始在

helpers

对象上调用我的helpers：

[10] pry(main)> helper.class
=> ActionView::Base
[1] pry(main)> helper.link_to gravatar_for(User.first, size: 50), User.first
  User Load (0.2ms)  SELECT  "users".* FROM "users" ORDER BY "users"."id" ASC LIMIT ?  [["LIMIT", 1]]
NoMethodError: undefined method `gravatar_for' for main:Object
from (pry):1:in `__pry__'
[2] pry(main)> include UsersHelper
=> Object
[3] pry(main)> helper.link_to gravatar_for(User.first, size: 50), User.first
  User Load (0.2ms)  SELECT  "users".* FROM "users" ORDER BY "users"."id" ASC LIMIT ?  [["LIMIT", 1]]
NoMethodError: undefined method `image_tag' for main:Object
from /Users/max/Dropbox/work/src/github.com/mbigras/micro-twitter/app/helpers/users_helper.rb:7:in `gravatar_for'
[4] pry(main)> include ActionView::Helpers::AssetTagHelper
=> Object
[5] pry(main)> helper.link_to gravatar_for(User.first, size: 50), User.first
  User Load (0.1ms)  SELECT  "users".* FROM "users" ORDER BY "users"."id" ASC LIMIT ?  [["LIMIT", 1]]
  User Load (0.1ms)  SELECT  "users".* FROM "users" ORDER BY "users"."id" ASC LIMIT ?  [["LIMIT", 1]]
ArgumentError: arguments passed to url_for can't be handled. Please require routes or provide your own implementation
from /Users/max/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/actionview-5.0.0.1/lib/action_view/helpers/url_helper.rb:38:in `url_for'
[6] pry(main)> include ActionView::Helpers::UrlHelper
=> Object
[7] pry(main)> helper.link_to gravatar_for(User.first, size: 50), User.first
  User Load (0.3ms)  SELECT  "users".* FROM "users" ORDER BY "users"."id" ASC LIMIT ?  [["LIMIT", 1]]
  User Load (0.2ms)  SELECT  "users".* FROM "users" ORDER BY "users"."id" ASC LIMIT ?  [["LIMIT", 1]]
ArgumentError: arguments passed to url_for can't be handled. Please require routes or provide your own implementation
from /Users/max/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/actionview-5.0.0.1/lib/action_view/helpers/url_helper.rb:38:in `url_for'
[8] pry(main)> include ActionController::Metal
TypeError: wrong argument type Class (expected Module)
from (pry):8:in `include'
[9] pry(main)>

然后我尝试了一种不同的技术，我在答案中看到了这种技术，它创建了一个

views\u helper

对象。老实说，我不确定

helper

对象与

views\u helper

对象有何不同，但无论如何，我仍然无法运行命令

[15] pry(main)> views_helper.class
=> ActionView::Base
[11] pry(main)> views = Rails::Application::Configuration.new(Rails.root).paths["app/views"]; nil
=> nil
[12] pry(main)> views_helper = ActionView::Base.new views; nil
=> nil
[13] pry(main)> views_helper.link_to gravatar_for(User.first, size: 50), User.first
  User Load (0.1ms)  SELECT  "users".* FROM "users" ORDER BY "users"."id" ASC LIMIT ?  [["LIMIT", 1]]
  User Load (0.1ms)  SELECT  "users".* FROM "users" ORDER BY "users"."id" ASC LIMIT ?  [["LIMIT", 1]]
ArgumentError: arguments passed to url_for can't be handled. Please require routes or provide your own implementation
from /Users/max/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/actionview-5.0.0.1/lib/action_view/helpers/url_helper.rb:38:in `url_for'
[14] pry(main)>

---

我希望能够将一些东西放在config/env文件中的某个地方，或者在控制台上运行一个“包含所有内容以便我的助手‘正常工作’”的oneliner。这可能吗？

我不确定是否会自动将助手方法加载到控制台中，但是 您可以通过在控制台中调用ApplicationController.helpers来访问各个帮助程序方法。

ArgumentError: arguments passed to url_for can't be handled. Please require routes or provide your own implementation

当我尝试使用我的Rails 5.1应用程序中的

帮助程序时出错。请链接到

将
route.url\u helpers
包含到
helper
对象中，这样可以解决我的问题：

main > helper.singleton_class.include Rails.application.routes.url_helpers
=> #<Class:#<ActionView::Base:0x00007fb02c2f7478>>

main > helper.link_to 'user', User.find(1)
=> "<a href=\"/users/1\">user</a>"

main>helper.singleton\u class.include Rails.application.routes.url\u helpers
=>#简单的方法是使用模块名称空间：

UserHelper.some_method

但是，您应该使用self来定义方法：

module UserHelper
  def self.some_method
    puts 'hello world!'
  end 
end