我有以下型号
类图书<的ActiveRecord :: Base的
的has_many:章节
结束
和
班章<的ActiveRecord :: Base的
belongs_to的:书
结束
在 /章节/编辑/ ID
我收到
未定义的方法'书'的#<的ActiveRecord ::关联:0x0000010378d5d0>
当我尝试访问的书像这样
@ chapter.book
解决方案
看起来@chapter不是一个单独的章节对象。如果@chapter初始化是这样的:
@chapter = Chapter.where(:ID => PARAMS [:ID])
则得到一个关联对象(可以被视为一个集合,但不是一个单一的对象)。所以,你需要使用检索记录 find_by_id
,或采取从集合的第一个来解决这个问题。
@chapter = Chapter.where(:ID => PARAMS [:ID])。第一
或
@chapter = Chapter.find_by_id(PARAMS [:ID])
I have the following models
class Book < ActiveRecord::Base
has_many :chapters
end
and
class Chapter < ActiveRecord::Base
belongs_to :book
end
in /chapters/edit/id
I get
undefined method `book' for #<ActiveRecord::Relation:0x0000010378d5d0>
when i try to access book like this
@chapter.book
解决方案
Looks like @chapter is not a single Chapter object. If @chapter is initialized something like this:
@chapter = Chapter.where(:id => params[:id])
then you get a Relation object (that can be treated as a collection, but not a single object). So to fix this you need to retrieve a record using find_by_id
, or take a first one from the collection
@chapter = Chapter.where(:id => params[:id]).first
or
@chapter = Chapter.find_by_id(params[:id])