诗歌rails 之自定义Helper模块

关键字: Rails Helper

Rails默认为每个controller指定一个helper，所有的helper都放在app/helpers目录下
但是有些Helper我们希望是全局共享的，一般我们将这些Helper方法都扔在ApplicationHelper模块里
其实我们可以在app/helpers目录下建立我们自定义的Helper模块，如formatting_helper、path_helper等

# formatting_helper.rb
module FormattingHelper
  def free_when_zero(price)
    price.zero? ? "FREE" : number_to_currency(price)
  end

  def yes_no(bool)
    bool? 'Yes' : 'No'
  end
end

# path_helper.rb
module PathHelper
  def articles_path_for_article(article)
    if article.tip?
      tips_articles_path
    else
      news_articles_path
    end
  end

  def product_path(product)
    if product.kind_of? Book
      book_path(product)
    else
      movie_path(product)
    end
  end
end

# formatting_helper.rb module FormattingHelper   def free_when_zero(price)     price.zero? ? "FREE" : number_to_currency(price)   end    def yes_no(bool)     bool? 'Yes' : 'No'   end end  # path_helper.rb module PathHelper   def articles_path_for_article(article)     if article.tip?       tips_articles_path     else       news_articles_path     end   end    def product_path(product)     if product.kind_of? Book       book_path(product)     else       movie_path(product)     end   end end 

要想使用这些Helper，我们只需修改ApplicationController即可

class ApplicationController < ActionController::Base
  helper :formatting, :path
end

class ApplicationController < ActionController::Base   helper :formatting, :path end 

或者直接使用helper :all来使用所有的Helper