Javascript嵌套窗體Railcasts

Question

嗨，我想要做的嵌套形式，第1部分和第2部分的欄目。它似乎我有幾個問題，我不明白爲什麼。

Question 1: The add and remove links don't works, they show up but don't actually execute anything 
Question 2: I get the following error code and don't understand why? The error is regarding the f.error_messages is not recognized 
Question 3: When trying to create a surveys i get: Can't mass-assign protected attributes: answer 

謝謝你在這裏我的代碼相似railcasts 196,197

模型問題

class Question < ActiveRecord::Base 
    belongs_to :survey 
    attr_accessible :content, :question_id, :name, :answers_attributes 
    has_many :answers, :dependent => :destroy 
    accepts_nested_attributes_for :answers , :reject_if => lambda { |a| a[:content].blank? }, :allow_destroy => true 
end 

標準答案

class Answer < ActiveRecord::Base 
    belongs_to :question 
    attr_accessible :content, :question_id 
end 

示範調查

class Survey < ActiveRecord::Base 
    has_many :questions, :dependent => :destroy 
    accepts_nested_attributes_for :questions , :reject_if => lambda { |a| a[:content].blank? }, :allow_destroy => true 
    attr_accessible :name, :questions_attributes 
end 

個

視圖 形式

<%= form_for(@survey) do |f| %> 
    <div class="field"> 
    <%= f.label :name %><br /> 
    <%= f.text_field :name %> 
    </div> 
    <p><%= link_to_add_fields "Add Question", f, :questions %></p> 
    <%= f.fields_for :questions do |bf|%> 
    <% render 'question_fields', :f => bf %> 
    <% end %> 

    <div class="actions"> 
    <%= f.submit %> 
    </div> 
<% end %> 

的question_fields

<p> 
    <%= f.label :content, "Question" %><br /> 
    <%= f.text_area :content, :rows=> 3 %> 
    <%= f.check_box :_destroy %> 
    <%= link_to_remove_fields "remove", f %> 
</p> 
<p><%= link_to_add_fields "Add Answer", f, :answers %></p> 
<%= f.fields_for :answer do |form| %> 
    <%= render 'answer_fields', :f => form %> 
<% end %> 

answer_fields

<p class="fields"> 
    <%= f.label :content, "Answer" %> 
    <%= f.text_field :content %> 
    <%= link_to_remove_fields "remove", f %> 
</p> 

控制器

的javascript 的application.js

function remove_fields(link) { 
    $(link).previous("input[type=hidden]").value = "1"; 
    $(link).up(".fields").hide(); 
} 

function add_fields(link, association, content) { 
    var new_id = new Date().getTime(); 
    var regexp = new RegExp("new_" + association, "g") 
    $(link).up().insert({ 
    before: content.replace(regexp, new_id) 
    }); 
} 

application_jquery.js

function remove_fields(link) { 
    $(link).prev("input[type=hidden]").val("1"); 
    $(link).closest(".fields").hide(); 
} 

function add_fields(link, association, content) { 
    var new_id = new Date().getTime(); 
    var regexp = new RegExp("new_" + association, "g") 
    $(link).parent().before(content.replace(regexp, new_id)); 
} 

任何幫助表示讚賞。

這裏的鏈接教程 http://railscasts.com/episodes/196-nested-model-form-part-1 http://railscasts.com/episodes/197-nested-model-form-part-2

而且路線不知道你的意思。

Surveysays::Application.routes.draw do 
    resources :surveys 
end 

Answer 1

問題1：按下按鈕時不會調用這些函數。在railscast中，他將link_to_remove和link_to_add添加到應用程序助手。

module ApplicationHelper 
    def link_to_remove_fields(name, f) 
    f.hidden_field(:_destroy) + link_to_function(name, "remove_fields(this)") 
    end 

def link_to_add_fields(name, f, association) 
    new_object = f.object.class.reflect_on_association(association).klass.new 
    fields = f.fields_for(association, new_object, :child_index => "new_#{association}") do |builder| 
     render(association.to_s.singularize + "_fields", :f => builder) 
    end 
    link_to_function(name, "add_fields(this, \"#{association}\", \"#{escape_javascript(fields)}\")") 
    end 
end 

問題2：不知道，但它可能被清除了一些其他的修復

問題3：你有一個類型的位置：

<%= f.fields_for :answer do |form| %> 
    <%= render 'answer_fields', :f => form %> 
<% end %> 

應該

<%= f.fields_for :answers do |form| %> 
    <%= render 'answer_fields', :f => form %> 
<% end %> 

這是答案，因爲你有一個has_many關係船。屬性答案不存在，默認情況下也列入白名單。這就是爲什麼你得到質量分配錯誤。

也有這樣一個簡單的版本在他修改過的插曲：

http://railscasts.com/episodes/196-nested-model-form-revised