Ruby on rails Rails 4找不到关联，通过：relationship error

对。这根本不起作用。我已经做了好几个小时了

专辑型号

class Album < ActiveRecord::Base
  has_many :features, through: :join_table1
end

class Feature < ActiveRecord::Base
  has_many :albums, through: :join_table1
end

class JoinTable1 < ActiveRecord::Base
  belongs_to :features
  belongs_to :albums
end

class Album < ActiveRecord::Base
  has_many :join_table1
  has_many :features, through: :join_table1
end

class Feature < ActiveRecord::Base
  has_many :join_table1
  has_many :albums, through: :join_table1
end

class JoinTable1 < ActiveRecord::Base
  belongs_to :features
  belongs_to :albums
end

相册模式

album_id | feature_id

id | title | release_date | genre | artist_id | created_at | updated_at | price | image_path

id | feature | created_at | updated_at

功能模式

album_id | feature_id

id | title | release_date | genre | artist_id | created_at | updated_at | price | image_path

id | feature | created_at | updated_at

扫描测试数据库并运行此集成测试后：

require 'test_helper'

class DataFlowTest < ActionDispatch::IntegrationTest
  test "create new user" do
    album = albums(:one)
    feature = features(:one)
    album.features
  end
end

需要“测试助手”
类DataFlowTest

我明白了

ActiveRecord:：HasManyThroughAssociationNotFoundError:在模型相册中找不到关联：join_table1

---

这是为什么？

您需要在相册和功能模型中添加

有很多：相册功能

（假设您将JoinTable1模型重命名为更有意义的AlbumFeature，相应的表将是

相册功能

），因为

：通过

引用关联-您的错误就在于此

---

或者，您可以使用

has\u和\u belies\u to \u many

，这样就不需要定义特殊的链接模型。但是在这种情况下，您必须命名您的表

albums\u features

，只需定义如下模型

专辑型号

class Album < ActiveRecord::Base
  has_many :features, through: :join_table1
end

class Feature < ActiveRecord::Base
  has_many :albums, through: :join_table1
end

class JoinTable1 < ActiveRecord::Base
  belongs_to :features
  belongs_to :albums
end

class Album < ActiveRecord::Base
  has_many :join_table1
  has_many :features, through: :join_table1
end

class Feature < ActiveRecord::Base
  has_many :join_table1
  has_many :albums, through: :join_table1
end

class JoinTable1 < ActiveRecord::Base
  belongs_to :features
  belongs_to :albums
end

classalbum

功能模型

class Album < ActiveRecord::Base
  has_many :features, through: :join_table1
end

class Feature < ActiveRecord::Base
  has_many :albums, through: :join_table1
end

class JoinTable1 < ActiveRecord::Base
  belongs_to :features
  belongs_to :albums
end

class Album < ActiveRecord::Base
  has_many :join_table1
  has_many :features, through: :join_table1
end

class Feature < ActiveRecord::Base
  has_many :join_table1
  has_many :albums, through: :join_table1
end

class JoinTable1 < ActiveRecord::Base
  belongs_to :features
  belongs_to :albums
end

class功能

加入表1模型

class Album < ActiveRecord::Base
  has_many :features, through: :join_table1
end

class Feature < ActiveRecord::Base
  has_many :albums, through: :join_table1
end

class JoinTable1 < ActiveRecord::Base
  belongs_to :features
  belongs_to :albums
end

class Album < ActiveRecord::Base
  has_many :join_table1
  has_many :features, through: :join_table1
end

class Feature < ActiveRecord::Base
  has_many :join_table1
  has_many :albums, through: :join_table1
end

class JoinTable1 < ActiveRecord::Base
  belongs_to :features
  belongs_to :albums
end

class JointTable1

类似于@mad_raz的回答，但联接表需要为所属对象设置奇点，如下所示：

class JoinTable1 < ActiveRecord::Base
  belongs_to :feature
  belongs_to :album
end

class JointTable1

完整的关联教程也发生在我身上。 通过向两个模型中添加join表使其工作。 这样地： 连接模型：

module Alerts
  class AlertIncidentConnection < ActiveRecord::Base
    belongs_to :incident
    belongs_to :alert
  end
end 

模块警报
类AlertIncidentConnection

警报模型：

module Alerts
  class Alert < ActiveRecord::Base
    has_many :alert_incident_connections, class_name: 'Alerts::AlertIncidentConnection'
    has_many :incidents, through: :alert_incident_connections,class_name: 'Alerts::Incident', dependent: :destroy
  end
end

模块警报
类警报

事件模型：

module Alerts
  class Incident < ActiveRecord::Base    
    has_many :alert_incident_connections, class_name: 'Alerts::AlertIncidentConnection'
    has_many :alerts, through: :alert_incident_connections,class_name: 'Alerts::Alert' ,dependent: :destroy
  end
end

模块警报
类事件

迁移文件：

class CreateTableAlertIncidentConnections < ActiveRecord::Migration
  def change
    create_table :alert_incident_connections do |t|
      t.references :alert, null: false, index: true
      t.references :incident, null: false, index: true
      t.timestamps
    end
  end
end

class CreateTableAlertIncidentConnections

用法：

alert.incidents << incident
alert.save!

---

alert.incents我认为联接表的命名约定与has\u many，through关系无关。重要的是，不能有两个具有名称功能的模型。另外，activerecord模型的名称应与其表名相对应。如果命名约定重要，您会将其命名为album\u features还是features\u album？正如@starkers所提到的，事实并非如此。我也有同样的问题，除了通过外，在相册和功能中添加has_many是答案中唯一相关的部分。@msanjay是的，你是对的，命名与has_many:through无关（虽然它与has_和_属于_many有关，但表名中的首字母顺序是用AIK字母顺序决定的），这是针对问题的第一个版本，其中有两个错误。问题已经更新，所以我也会更新答案，谢谢。