ruby-on-rails – Rails 4找不到关联has_many,通过：关系错误

专辑模特儿

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

特征模型

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

join_table1模型

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

join_table1模式

album_id | feature_id

专辑模式

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

功能模式

id | feature | created_at | updated_at

在碾压测试数据库并运行此集成测试：

require 'test_helper'

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

我得到

ActiveRecord::HasManyThroughAssociationNotFoundError: Could not find the association :join_table1 in model Album

为什么是这样？