Rails 3 自定义 FormBuilder 参数 [英] Rails 3 Custom FormBuilder Parameters

问题描述

我为我的应用程序创建了一个自定义 FormBuilder，但我不明白为什么我需要按如下方式传递两个参数:

I create a custom FormBuilder for my application, but I dont understand why I need to pass tow parameters as follow:

f.text_field :my_model, :my_field

这是我的构建器:

class AceBuilder < ActionView::Helpers::FormBuilder
  %w[text_field password_field text_area].each do |method_name|
    define_method(method_name) do |object_name, method, *args|
      options = args.extract_options!

      @template.content_tag(:div, :class => "control-group #{@object.errors[method].length > 0 ? 'error' : ''}") do
        @template.concat(
            @template.content_tag(:label,
                                  options[:label] || method.to_s.humanize,
                                  :class => 'control-label',
                                  :for => "#{object_name}_#{method}"))
        @template.concat(
            @template.content_tag(:div,
                                  :class => "controls") do
              @template.concat(super(method))

              @template.concat(
                  @template.content_tag(:span,
                                        @object.errors[method].join,
                                        :for => "#{object_name}_#{method}",
                                        :class => "help-inline"
                  )
              )
            end
        )
      end
    end
  end

我知道

define_method(method_name) do |object_name, method, *args|

有两个参数，所以我的问题是:

has two parameters, so my question is:

我该如何编写这个 FormBuilder，这样我就可以这样称呼它:

How can I write this FormBuilder, such a way that I can call it like this:

f.text_field :my_field

谢谢.

推荐答案

这很容易，在我意识到如何:用 @​​object_name 替换 object_name

That was easy, after I realize how: replace object_name by @object_name

class AceBuilder < ActionView::Helpers::FormBuilder
  %w[text_field password_field text_area].each do |method_name|
    define_method(method_name) do |method, *args|
      options = args.extract_options!

      @template.content_tag(:div, :class => "control-group #{@object.errors[method].length > 0 ? 'error' : ''}") do
        @template.concat(
            @template.content_tag(:label,
                                  options[:label] || method.to_s.humanize,
                                  :class => 'control-label',
                                  :for => "#{@object_name}_#{method}"))
        @template.concat(
            @template.content_tag(:div,
                                  :class => "controls") do
              @template.concat(super(method))

              @template.concat(
                  @template.content_tag(:span,
                                        @object.errors[method].join,
                                        :for => "#{@object_name}_#{method}",
                                        :class => "help-inline"
                  )
              )
            end
        )
      end
    end
  end

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