我正在测试rails控制台中的一些助手。
我读过描述一些技巧的文章。
在我的第一次尝试中，我开始调用helpers对象上的助手：
[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)>
然后我尝试了一种不同的技术，我在答案中看到了它创建了一个
views_helper对象老实说，我不确定helper对象与views_helper对象有什么不同，但无论如何，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)>
我希望能够把一些东西放到config/env文件中的某个地方，或者在控制台上运行一个oneliner，它“包含所有东西，这样我的助手就可以工作了”这可能吗？
最佳答案
我不确定是否会自动将helper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.your_method来访问各个帮助程序方法。