Question

我想使用accepts_nested_attributes_for创建一个has_many部分的文章对象。

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

只要:reject_if条件接受嵌套属性（如果title属性不是blank?），我就会看到SQLException。否则，将在没有相关章节的情况下成功创建文章。

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Section Load阶段出现的问题，因为WHERE (article)是意料之外的。谢谢你的阅读。

Answer 1

这里的问题是你的acts_as_list :scope => "article"调用，如果你提供了一个字符串，那么gem会认为这是一个字面意义上的SQL。您想在此使用:article - 告诉acts_as_list使用:article关联。

accepts_nested_attributes_for导致SQLException

1 个答案: