将ActionView :: Helpers :: FormBuilder传递给partial [英] Passing ActionView::Helpers::FormBuilder to a partial

问题描述

我试图在给定某个AJAX请求的情况下创建表单元素。

这是我的设置：

查看：

 <％= link_to'下一步'，check_unique_id_students_path，：remote => true％> 
 
< div id =guardian_student_details>< / div> 
  

控制器：

  def check_unique_id 
 @student = Student.new 
 @this_form = ActionView :: Helpers :: FormBuilder.new（：student，@student，@template，{}，proc {}） 
 end 
  

JS：

<$ p： jQuery（＃guardian_student_details）。html（<％= escape_javascript（render：partial =>student_details，：locals => {：s => @this_form }）％>）;


部分：

 <％puts s.text_field：first_name％> 
 <％puts s.field_helpers％> 
  

出于调试的目的，我在我的部分开头部分放置了以下几行：

 <％puts s.class.to_s％> 
 <％puts s.object.to_s％> 
  

打印出来：

  ActionView :: Helpers :: FormBuilder 
 Student 
  

工作。但是，轨道提供了以下错误：

  ActionView :: Template :: Error（nil：NilClass的未定义方法`text_field'） ：
 1：<％puts s.class.to_s％> 
 2：< p> 
 3：<％= s.text_field：first_name，：class => 'text_input is_empty'％> 
 4：<％= s.label：first_name％>< strong> *< / strong> 
 5：< / p> 
 6：
  

app / views / students / _student_details.html.erb：3：in _app_views_students__student_details_html_erb__2485891544130782916_2214680440'
app / views / students / check_unique_id.js.erb：2：in _app_views_students_check_unique_id_js_erb__3504800328150418937_2214933160'

这意味着s是NIL，我之前只验证了2行。有人有任何想法吗？我不知道这是否与在控制器中初始化的@template变量有关。我玩过并接受几乎任何东西，如果打印是零。
任何帮助，将不胜感激。谢谢

最后说明：

我试图实现这一点： recensted_attributes_for partials的AJAX更新

解决方案

对于任何需要在控制器中构建表单构建器的人来说，view_context仍然适用。使用Rails 4.1.4：

  @object = Object.new 
 @f = ActionView :: Helpers :: FormBuilder .new（：object，@object，view_context，{}）
  

I am atempting to dinamically create form elements given a certain AJAX request.

This is my setup:

View:

    <%= link_to 'Next', check_unique_id_students_path, :remote => true %>

    <div id="guardian_student_details"></div>

Controller:

def check_unique_id
    @student = Student.new
    @this_form = ActionView::Helpers::FormBuilder.new(:student, @student, @template, {}, proc{})
  end

JS:

jQuery("#guardian_student_details").html("<%=escape_javascript(render :partial => "student_details", :locals => { :s => @this_form }) %>");

Partial:

<% puts s.text_field :first_name   %>
<% puts s.field_helpers   %>

For debugging purposes i placed the following lines at the very beginning of my partial:

<% puts s.class.to_s %>
<% puts s.object.to_s %>

This prints out :

ActionView::Helpers::FormBuilder
Student

This should work. However rails is giving the following error:

ActionView::Template::Error (undefined method `text_field' for nil:NilClass):
1: <% puts s.class.to_s   %>
2: <p>
3: <%= s.text_field :first_name, :class => 'text_input is_empty' %>
4: <%= s.label :first_name %><strong>*</strong> 
5: </p>
6: 

app/views/students/_student_details.html.erb:3:in _app_views_students__student_details_html_erb__2485891544130782916_2214680440' app/views/students/check_unique_id.js.erb:2:in_app_views_students_check_unique_id_js_erb__3504800328150418937_2214933160'

Which implies that "s" is NIL something I verified just 2 lines before. Does anybody have any ideas? i dont know if this has something to do with the "@template" variable initialized in the controller. Which i played around with and accepts practically anything and if printed is nil. Any help would be appreciated. Thanks

Final note:

I tried to implement this: AJAX update of accepts_nested_attributes_for partials

解决方案

For anyone needing to build a form builder in the controller, view_context still works there. Using Rails 4.1.4:

@object = Object.new
@f = ActionView::Helpers::FormBuilder.new(:object, @object, view_context, {})

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