我正在尝试按照以下方式为帖子创建标签导轨指南 http://guides.rubyonrails.org/getting_started.html:
tag.rb:
class Tag < ActiveRecord::Base
attr_accessible :name
belongs_to :post
end
post.rb:
class Post < ActiveRecord::Base
attr_accessible :title, :content, :tags
validates :title, :presence => true,
:length => { :maximum => 30 },
:uniqueness => true
validates :content, :presence => true,
:uniqueness => true
belongs_to :user
has_many :comments, :dependent => :destroy
has_many :votes, :as => :votable, :dependent => :destroy
has_many :tags
accepts_nested_attributes_for :tags, :allow_destroy => :true,
:reject_if => proc { |attrs| attrs.all? { |k, v| v.blank? } }
end
视图/帖子/_form.html.erb:
<% @post.tags.build %>
<%= form_for(@post) do |post_form| %>
<%= render 'shared/error_messages' %>
<div class="field">
<%= post_form.label :title %><br />
<%= post_form.text_field :title %>
</div>
<div class="field">
<%= post_form.label :content %><br />
<%= post_form.text_area :content %>
</div>
<h2>Tags</h2>
<%= render :partial => 'tags/form',
:locals => {:form => post_form} %>
<div class="actions">
<%= post_form.submit %>
</div>
<% end %>
视图/标签/_form.html.erb:
<%= form.fields_for :tags do |tag_form| %>
<div class="field">
<%= tag_form.label :name, 'Tag:' %>
<%= tag_form.text_field :name %>
</div>
<% unless tag_form.object.nil? || tag_form.object.new_record? %>
<div class="field">
<%= tag_form.label :_destroy, 'Remove:' %>
<%= tag_form.check_box :_destroy %>
</div>
<% end %>
<% end %>
但是当我尝试创建标签时出现此错误:
无法批量分配受保护的属性:tags_attributes Rails.root:
/home/alex/rails/r7
应用追踪 |框架跟踪 |完整追踪
app/controllers/posts_controller.rb:25:在“创建”请求中
参数:
{“utf8”=>“✓”,
“authenticity_token”=>“VF/qlfZ4Q5yvPY4VIbpFn65hoTAXdEa4fb4I1Ug4ETE=”,
"post"=>{"title"=>"帖子编号 5", "content"=>"帖子编号 5 帖子
编号 5 发布编号 5", "tags_attributes"=>{"0"=>{"name"=>"food,
饮料"}}},"提交"=>"创建帖子"}
有什么建议来解决这个问题吗?