關鍵字: Rails Helper Rails默認為每個controller指定一個helper，所有的helper都放在app/helpers目錄下
但是有些Helper我們希望是全局共享的，一般我們將這些Helper方法都扔在ApplicationHelper模塊里
其實我們可以在app/helpers目錄下建立我們自定義的Helper模塊，如formatting_helper、path_helper等
ruby代碼

#?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 要想使用這些Helper，我們只需修改ApplicationController即可
ruby代碼

class?ApplicationController?<?ActionController::Base??

??helper?:formatting,?:path??

end??

class ApplicationController < ActionController::Base helper :formatting, :path end 或者直接使用helper :all來使用所有的Helper

轉(zhuǎn)載于:https://www.cnblogs.com/orez88/articles/1520407.html

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