Ruby on rails Ruby on Rails上的动态调查创建

我希望用户创建一个事件，在此事件上，他们需要能够创建一个动态表单，以便用户“注册”事件（动态创建字段）。然后提交到此表单的数据将存储在数据库中。我用了大部分时间才达到现在的水平

到目前为止，我的结构如下所示：

class Admin::Event < ActiveRecord::Base
  attr_accessible :body, :date, :title, :end_date, :status, :event_location_id, :payment, :fields_attributes, :answers

  belongs_to :event_location

  has_many :fields, class_name: "Admin::EventField"
  has_many :event_surveys
  accepts_nested_attributes_for :fields, allow_destroy: true

end

Show.html.erb：

<%= form_for @event_survey_answer do |f| %>
<% if @event_survey_answer.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@event_survey_answer.errors.count, "error") %> prohibited this event_survey_answer from being saved:</h2>

      <ul>
      <% @event_survey_answer.errors.full_messages.each do |msg| %>
        <li><%= msg %></li>
      <% end %>
      </ul>
    </div>
  <% end %>

  <% f.fields_for :admin_event do %>
    <%= @event.fields.each do |field| %>
        <%= render "admin/events/fields/#{field.field_type}", locals: { field: field, f: builder }  %>
    <% end %>
  <% end %>


  <%= f.submit %>
<% end %>

---

将

builder

替换为

f

@apreading now I get

未定义的局部变量或方法“f”

在部分_text\u field.html.erb上显示_text\u field.html的代码。erb@SachinSingh

使用此行而不是

class Admin::EventSurvey < ActiveRecord::Base
  attr_accessible :admin_event_id, :answers

  has_one :admin_event, :class_name => "Admin::Event"
  accepts_nested_attributes_for :admin_event, :allow_destroy => true

  serialize :answers, Hash
end

  # Admin::EventsController 

  # GET /events/1
  # GET /events/1.json
  def show
    @event = Admin::Event.find(params[:id])
    @event_survey_answer = Admin::EventSurvey.new(admin_event_id: params[:id])

    respond_to do |format|
      format.html # show.html.erb
      format.json { render json: @event }
    end
  end

<%= form_for @event_survey_answer do |f| %>
<% if @event_survey_answer.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@event_survey_answer.errors.count, "error") %> prohibited this event_survey_answer from being saved:</h2>

      <ul>
      <% @event_survey_answer.errors.full_messages.each do |msg| %>
        <li><%= msg %></li>
      <% end %>
      </ul>
    </div>
  <% end %>

  <% f.fields_for :admin_event do %>
    <%= @event.fields.each do |field| %>
        <%= render "admin/events/fields/#{field.field_type}", locals: { field: field, f: builder }  %>
    <% end %>
  <% end %>


  <%= f.submit %>
<% end %>

undefined local variable or method `builder'