如何正确扩展form_for/ActionView :: Helpers :: FormBuilder？

Question

这与Trying扩展ActionView :: Helpers :: FormBuilder类似,但我不想使用:builder => MyThing.

我想扩展表单生成器以添加自定义方法.这是目前的情况:

module ActsAsTreeHelpers
  def acts_as_tree_block(method, &block)
    yield if block_given?
  end

end


ActionView::Helpers::FormBuilder.send :include, ::ActsAsTreeHelpers

安慰:

ruby-1.9.2-p180 :004 > ActionView::Helpers::FormBuilder.included_modules
=> [ActsAsTreeHelpers, ...]

但以下给了我: undefined method acts_as_tree_block for #<ActionView::Helpers::FormBuilder:0xae114dc>

<%= form_for thing do |form| %>
  <%= form.acts_as_tree_block :parent_id, {"test"} %>
<% end %>

我在这里错过了什么？

Answer 1

我也有同样的问题.我试图在我的项目的文件夹配置/初始化程序中添加一个名为form_builder.rb的新文件,它现在运行良好.

以下是我的解决方案的一些内容.base_helper.rb

def field_container(model, method, options = {}, &block)
  css_classes = options[:class].to_a
  if error_message_on(model, method).present?
    css_classes << 'withError'
  end
  content_tag('p', capture(&block), :class => css_classes.join(' '), :id => "#{model}_#{method}_field")
end

form_builder.rb

class ActionView::Helpers::FormBuilder
  def field_container(method, options = {}, &block)
    @template.field_container(@object_name,method,options,&block)
  end

  def error_message_on(method, options = {})
    @template.error_message_on(@object_name, method, objectify_options(options))
  end
end
ActionView::Base.field_error_proc = Proc.new{ |html_tag, instance| "<span class=\"field_with_errors\">#{html_tag}</span>".html_safe }

_form.html.erb

<%= f.field_container :name do %>
  <%= f.label :name, t("name") %> <span class="required">*</span><br />
  <%= f.text_field :name %>
  <%= f.error_message_on :name %>
<% end %>