Rails:HasManyThroughAssociationNotFoundError
has_many through
关联获得has_many through
工作,我有问题。
我不断得到这个例外:
Article.find(1).warehouses.build ActiveRecord::HasManyThroughAssociationNotFoundError: Could not find the association :entries in model Article
这些是涉及的模型:
class Article < ActiveRecord::Base has_many :warehouses, :through => :entries end class Warehouse < ActiveRecord::Base has_many :articles, :through => :entries end class Entry < ActiveRecord::Base belongs_to :article belongs_to :warehouse end
这是我的模式:
create_table "articles", :force => true do |t| t.string "article_nr" t.string "name" t.integer "amount" t.string "warehouse_nr" t.datetime "created_at" t.datetime "updated_at" t.integer "unit" end create_table "entries", :force => true do |t| t.integer "warehouse_id" t.integer "article_id" t.integer "amount" end create_table "warehouses", :force => true do |t| t.string "warehouse_nr" t.string "name" t.integer "utilization" t.datetime "created_at" t.datetime "updated_at" end
你需要添加
has_many :entries
对于每个模型,由于:through选项只是指定了应该用来查找另一边的第二个关联。
@Meekohi这意味着你没有Entry模型。 我刚刚收到错误消息,所以想指出(由于低信誉,不能发表评论)。
class Entry < ActiveRecord::Base belongs_to :article belongs_to :warehouse end
只需运行
rails g model Entry
你需要添加
has_many :entries
对每个模型,以上has_many:通过,像这样:
class Article < ActiveRecord::Base has_many :entries has_many :warehouses, :through => :entries end class Warehouse < ActiveRecord::Base has_many :entries has_many :articles, :through => :entries end
关于如何处理视图和控制器的更详细的教程https://kolosek.com/rails-join-table/