Question

我试图在rails控制台中测试一些助手。

我阅读了描述某些技巧的another answer。

在我的第一次尝试中，我开始在helpers对象上调用我的助手：

[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)>

然后我尝试了在创建views_helper对象的答案中看到的另一种技术。老实说，我不确定helper对象与views_helper对象的不同之处，但无论哪种方式，我仍然无法运行我的命令。

[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)>

我希望能够在某个地方的config / env文件中放置一些内容，或者在控制台上运行一个oneliner，其中包含所有内容，以便我的帮助者能够正常工作＆＃39;＆＃34 ;.这可能吗？

Answer 1

我碰到了同样的

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

我在Rails 5.1应用程序中尝试使用helper.link_to时出现

错误。

将route.url_helpers包含在这样的helper对象中为我解决了问题：

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>"

Answer 2

我不确定将辅助方法自动加载到控制台中您可以通过在控制台中调用ApplicationController.helpers.your_method来访问各个帮助程序方法。

Answer 3

简单的方法是使用模块命名空间：

UserHelper.some_method

但是，你应该使用self来定义方法：

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

在Rails 5控制台

3 个答案: