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我想在我的应用程序(运行 Rails 3.2)中覆盖 date_select 表单助手,以:selectedRails 4 date_select中引入参数。

覆盖默认的 Rails date_select现在有点老了,但我正在引用它来尝试使其工作。

所以我在一个文件中有以下内容lib/,包括在底部environment.rb

ActionView::Helpers::Tags::DateSelect.class_eval do
#
# Note: Using ActionView::Helpers::DateTimeSelector as suggested in 
# linked question doesn't error, but also doesn't seem to do anything.
#
  def datetime_selector(options, html_options)
    datetime = options[:selected] || value(object) || default_datetime(options)
    @auto_index ||= nil

    options = options.dup
    options[:field_name]           = @method_name
    options[:include_position]     = true
    options[:prefix]             ||= @object_name
    options[:index]                = @auto_index if @auto_index && !options.has_key?(:index)

    DateTimeSelector.new(datetime, options, html_options)
  end

end

但是,当尝试启动我的应用程序时,我看到:

NameError: uninitialized constant ActionView::Helpers::Tags

在控制台中播放时可以确认这一点:

1.9.3-p327 :001 > ActionView
 => ActionView 
1.9.3-p327 :002 > ActionView::Helpers
 => ActionView::Helpers 
1.9.3-p327 :003 > ActionView::Helpers::Tags
NameError: uninitialized constant ActionView::Helpers::Tags
  from (irb):3
  from /Users/colin/.rvm/gems/ruby-1.9.3-p327/gems/railties-3.2.11/lib/rails/commands/console.rb:47:in `start'
  from /Users/colin/.rvm/gems/ruby-1.9.3-p327/gems/railties-3.2.11/lib/rails/commands/console.rb:8:in `start'
  from /Users/colin/.rvm/gems/ruby-1.9.3-p327/gems/railties-3.2.11/lib/rails/commands.rb:41:in `<top (required)>'
  from script/rails:6:in `require'
  from script/rails:6:in `<main>'

那么,为什么ActionView::Helpers::Tags无效,什么时候定义类,以及如何正确覆盖该类以覆盖 datetime_selector 方法?


回答

在 Dan 指出我试图对错误的文件进行猴子补丁之后,解决方案相当简单——这段代码完成了这项工作(放置在初始化程序中):

ActionView::Helpers::InstanceTag.class_eval do
  def datetime_selector(options, html_options)
    datetime = options.fetch(:selected) { value(object) || default_datetime(options) }

    @auto_index ||= nil

    options = options.dup
    options[:field_name]           = @method_name
    options[:include_position]     = true
    options[:prefix]             ||= @object_name
    options[:index]                = @auto_index if @auto_index && !options.has_key?(:index)

    ActionView::Helpers::DateTimeSelector.new(datetime, options, html_options)
  end
end
4

1 回答 1

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ActionView::Helpers::Tags在 Rails 4 中是新的(您链接到 rails master 分支,即 4.0 分支),您正在使用 Rails 3.2.x 应用程序,您需要查看该 3.2stable 分支的源代码。这看起来像猴子补丁date_select的地方

于 2013-01-16T13:27:52.123 回答