无法批量分配受保护的属性:category_ids

时间:2012-07-15 16:37:59

标签: ruby-on-rails ruby-on-rails-3 associations nested-forms simple-form

我正在使用simple_form,我只想使用分类表在类别和文章之间创建关联。

但我有这个错误: 无法批量分配受保护的属性:category_ids。 app / controllers / articles_controller.rb:36:在`update'

articles_controller.rb

def update
    @article = Article.find(params[:id])
      if @article.update_attributes(params[:article]) ---line with the problem
        flash[:success] = "Статья обновлена"
        redirect_to @article
      else
        render :edit
      end
end

article.rb

has_many :categorizations
has_many :categories, through: :categorizations

category.rb

has_many :categorizations
has_many :articles, through: :categorizations

categorization.rb

belongs_to :article
belongs_to :category

分类包含article_id和category_id字段。

我的_form.html.erb

<%= simple_form_for @article, html: { class: "form-horizontal", multipart: true } do |f| %>
  <%= f.error_notification %> 
  <%= f.input :title %>
  <%= f.association :categories %>
  <%= f.input :teaser %>
  <%= f.input :body %>
  <%= f.input :published %>
 <% if @article.published? %>
   <%= f.button :submit, value: "Внести изменения" %>
 <% else %>
   <%= f.button :submit, value: "Опубликовать" %>
  <% end %>
<% end %>

2 个答案:

答案 0 :(得分:5)

你在article.rb中有attr_accessible吗?

如果是这样添加

     attr_accessible :title, :category_ids

另外请确保您真的想要所有表格...如果不是这样:

  attr_accessible :title, :category_ids, :as => :admin

然后

@article = Article.new
@article.assign_attributes({ :category_ids => [1,2], :title => 'hello' })
@article.category_ids # => []
@article.title # => 'hello'

@article.assign_attributes({ :category_ids => [1,2], :title => 'hello' }, :as => :admin)
@article.category_ids # => [1,2]
@article.title # => 'hello'
@article.save

@article = Article.new({ :category_ids => [1,2], :title => 'hello' })
@article.category_ids # => []
@article.title # => 'hello'

@article = Article.new({ :category_ids => [1,2], :title => 'hello' }, :as => :admin)
@article.category_ids # => [1,2]
@article.title # => 'hello'
@article.save

答案 1 :(得分:3)

创建的表单字段
<%= f.association :categories %>

将设置属性category_id,但该属性受到保护。在你的模型中,你应该有一行代码如下:

attr_accessible :title, :teaser, :body, :published

允许这些属性进行质量分配。如果您希望表单设置category_id,则必须将这些属性添加到attr_accessible方法中:

attr_accessible :title, :teaser, :body, :published, :category_id

这可以解决您的问题。