Accepts_nested_attributes_for 导致 SQLException

我想用accepts_nested_attributes_for创建一个 Article 对象has_many部分。

class Article < ActiveRecord::Base
  has_many :sections, :order => "position", :dependent => :destroy
  belongs_to :categories
  accepts_nested_attributes_for :sections, :allow_destroy => true, :reject_if => lambda { |attributes| attributes['title'].blank? }
  validates_presence_of :name, :on => :create, :message => "An article must have a title"
end

class Section < ActiveRecord::Base
  belongs_to :article
  acts_as_list :scope => "article"
  has_attached_file :image, 
                    :styles => { :medium => "300x300>",
                                 :thumb => "100x100>" }
end

每当:reject_if条件接受嵌套属性（如果title属性不是blank?) 我看到一个 SQLException。否则，文章将在没有关联章节的情况下成功创建。

Parameters: {"article"=>{"name"=>"My Article", "category_id"=>"7", "sections_attributes"=>{"0"=>{"title"=>"Section 1", "content"=>"Section 1 of my new article"}}}}

AREL (30.3ms)  INSERT INTO "articles" ("content", "category_id", "position", "name") VALUES (NULL, 7, NULL, 'My Article')

Section Load (0.4ms)  SELECT "sections".* FROM "sections" WHERE (article) ORDER BY position DESC LIMIT 1

SQLite3::SQLException: no such column: article: SELECT "sections".* FROM "sections" WHERE (article) ORDER BY position DESC LIMIT 1
Completed   in 68ms

我试图找出期间出了什么问题Section Load阶段，自WHERE (article)是出乎意料的。谢谢阅读。

你的问题是你的acts_as_list :scope => "article"打电话，按照acts_as_list 文档 http://rubydoc.info/gems/acts_as_list/0.1.2/ActsAsList/ClassMethods%3aacts_as_list如果你提供一个字符串，那么 gem 会认为它是 SQL，它将按字面意思使用。你想用:article这里 - 这告诉acts_as_list使用:article协会。