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我对连接表中的外键感到困惑。我试图建立一个连接表,将我的用户和指南模型链接起来形成一个FavoriteGuideline表(即用户可以选择一个最喜欢的指南)。加入表和外键
我的错误是:
'预计FavoriteGuideline有belongs_to的关联称为 喜爱(FavoriteGuideline没有favorite_id外键)'
我favorite_guideline.rb是
class FavoriteGuideline < ActiveRecord::Base
belongs_to :user
belongs_to :guideline
belongs_to :favorite, class_name: 'User', foreign_key: 'favorite_id'
attr_accessible :user, :favorite, :guideline
end
and my favorite_guideline_test.rb is
require 'test_helper'
class FavoriteGuidelineTest < ActiveSupport::TestCase
should belong_to(:user)
should belong_to(:favorite)
test "that creating a favorite works without raising an exception" do
assert_nothing_raised do
FavoriteGuideline.create user: users(:eve), guideline: guidelines(:three)
end
end
end
而且我的数据库迁移
class CreateFavoriteGuidelines < ActiveRecord::Migration
def change
create_table :favorite_guidelines do |t|
t.integer :user_id
t.integer :favorite_id
t.integer :guideline_id
t.timestamps
end
add_index :favorite_guidelines, [:user_id]
add_index :favorite_guidelines, [:favorite_id]
add_index :favorite_guidelines, [:guideline_id]
end
end
我爱你。谢谢。 – tessad 2013-02-12 08:04:04