我怀疑这可能是一个非常简单的错误,但我花了3个小时寻找它,所以我想我可能会向社区寻求帮助。
我正在浏览Ryan Bates关于嵌套模型表单的精彩截屏,并试图将它们应用到我自己的项目中。问题是嵌套属性似乎没有使用表单保存。我可以通过控制台保存它,但它只在显示时显示为空括号。
以下是相关代码:
表单视图(使用haml)
= form_for(@article) do |f|
- if @article.errors.any?
#error_explanation
%h2
= pluralize(@article.errors.count, "error")
prohibited this article from being saved:
%ul
- @article.errors.full_messages.each do |msg|
%li= msg
.field
= f.label :title
%br/
= f.text_field :title
.field
= f.label :intro
%br/
= f.text_area :intro
= f.fields_for :subsections do |builder|
= render 'subsections_fields', :f => builder
.field
= f.label :published_at
%br/
= f.text_field :published_at
.actions
= submit_or_cancel(f)
subsection_fields表单视图
= f.label :header
%br/
= f.text_field :header
= f.label :order_id
= f.number_field :order_id
%br/
= f.label :body
%br/
= f.text_area :body
%br/
= f.check_box :_destroy
= f.label :_destroy, "Remove Subsection"
%br/
控制器
class ArticlesController < ApplicationController
def new
@article = Article.new
3.times { @article.subsections.build }
end
def create
@article = Article.new(params[:article])
if @article.save
flash[:notice] = "Successfully created article."
redirect_to @article
else
render :action => 'new'
end
end
def edit
@article = Article.find(params[:id])
end
def update
@article = Article.find(params[:id])
if @article.update_attributes(params[:article])
flash[:notice] = "Successfully updated article."
redirect_to @survey
else
render :action => 'edit'
end
end
def destroy
Article.find(params[:id]).destroy
flash[:notice] = "Succesfully destroy article."
redirect_to articles_url
end
def show
@article = Article.find(params[:id])
end
def index
@articles = Article.all
end
end
和模型
class Article < ActiveRecord::Base
attr_accessible :title, :intro
has_many :subsections, :dependent => :destroy
accepts_nested_attributes_for :subsections, :reject_if => lambda { |a| a[:body].blank? },
:allow_destroy => true
has_and_belongs_to_many :categories
validates :title, :presence => true
end
class Subsection < ActiveRecord::Base
attr_accessible :header, :body, :order_id
belongs_to :article
validates :header, :presence => true
validates :body, :presence => true
end
非常感谢任何帮助解决这个问题。
答案 0 :(得分:1)
我不太确定,但是在您的attr_accessible :article_id
模型中也可以使用Subsection
进行尝试吗?
答案 1 :(得分:1)
将“attr_accessible”添加到模型会改变质量分配在rails中的工作方式。
如果删除模型中的“attr_accessible”行,那么所有代码都可以完美地运行。
类方法“accepts_nested_attributes_for”将“subsections_attributes =(value)”方法添加到模型中。
您向模型添加“attr_accessible”的第二个,您现在被迫为要通过质量分配分配的每个字段添加额外的“attr_accessible”条目。即当你使用Article.new(params [:article])时。
我希望这很清楚。
答案 2 :(得分:0)
我从另一个question找到了这个问题的答案。
答案是将我的subsections_attributes
设置为attr_accessible
,因此上面的文章模型应如下所示(我还将published_at
添加为attr_accessible
):< / p>
class Article < ActiveRecord::Base
attr_accessible :title, :intro, :subsections_attributes, :published_at
has_many :subsections, :dependent => :destroy
accepts_nested_attributes_for :subsections, :reject_if => lambda { |a| a[:body].blank? },
:allow_destroy => true
has_and_belongs_to_many :categories
validates :title, :presence => true
end