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我使用globalize gem来翻译我的 Rails 应用程序中的内容。当我将语言从默认语言 :en 更改为 :de 时，一切正常，但是当我想将语言从 :de 更改为 :en 时，我得到一个NoMethodError (undefined method 'color' for nil:NilClass)

我做了一些研究并尝试了一些方法，但不得不承认我并不完全理解这一点，这可能是错误的原因：

application_controller.rb

def set_locale
  I18n.locale = params[:locale] || I18n.default_locale
  request.subdomain
  request.env["HTTP_ACCEPT_LANGUAGE"]
  request.remote_ip
end

def default_url_options(options = {})
  (I18n.locale.to_sym.eql?(I18n.default_locale.to_sym) ? {} : {locale: I18n.locale})
end

我将非常感谢提示如何解决问题或对此代码如何工作的一些解释将非常受欢迎。

这是模型：

page.rb

class Page < ActiveRecord::Base

translates :name, :permalink

validates_uniqueness_of :permalink, :message => "This url is already taken"
validates_presence_of :permalink
validates_presence_of :name
validates_format_of   :permalink, :with => /\A[a-zA-Z0-9-_]*\z/i, :message => 'Url can only contain downcase letters from a-z and numbers from 0-9 and a dash and underscore'

before_save :only_allow_one_home_page

belongs_to :label
has_many :chapters
accepts_nested_attributes_for :chapters, :allow_destroy => true

mount_uploader :backgroundimage, BackgroundimageUploader

def chapters_for_form
 collection = chapters.where(page_id: id)
 collection.any? ? collection : chapters.build
end

def to_param
  permalink
end

end

和控制器： pages_controller.rb

def set_page
  @page = Page.find_by_permalink(params[:id])
end

和路线：

resources :labels, do
  resources :pages
end
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1 回答 1

1

尝试更改link_to以下内容：

<%= link_to 'E', params.merge(locale: "en") %>

一点解释：

# You must have `before_action :set_locale` somewhere in your controllers
# So, this method is called before your controller code does its job
def set_locale
  # This just sets current locale to params[:locale]
  # So when you request URL like http://example.org/controller/action?locale=de,
  # params[:locale] contains 'de'
  I18n.locale = params[:locale] || I18n.default_locale
end

# default_url_options is function which, well, adds default options
# to every call of url_for helper method
# It is also called internally when you build paths and urls for
# resources, like 'labels_path' or 'pages_url'
def default_url_options(options = {})
  # This line just says to add 'locale=...' parameter (locale: I18n.locale) to the request,
  # unless default locale is selected
  # This will preserve your locale between requests
  (I18n.locale.to_sym.eql?(I18n.default_locale.to_sym) ? {} : {locale: I18n.locale})
end

现在，回到错误。您必须为您的 link_to 助手提供 URL 参数。您只提供“语言环境”，但它应该以某种方式确定您希望链接指向哪个页面。通过添加params.merge(locale: en)我们指示它使用当前参数（因此它将链接到当前页面），只需额外添加locale参数给它。

于 2015-08-06T10:13:10.633 回答