相關：銷燬工作不

Question

我有以下情況：

user.rb

class User < ActiveRecord::Base 
    # Include default devise modules. Others available are: 
    # :confirmable, :lockable, :timeoutable and :omniauthable 
    devise :database_authenticatable, :registerable, 
     :recoverable, :rememberable, :trackable, :validatable 

    after_create :create_profile 
    after_create :programstart 

    has_one :profile, dependent: :destroy 
    has_many :weights, dependent: :destroy 
    has_many :programstarts, dependent: :destroy 

    has_many :user_nutrients, dependent: :destroy 
    has_many :nutrients, through: :user_nutrients, dependent: :destroy 


    private 

    def programstart 
    Programstart.create(:user_id => id) 
    end 
end 

nutrient.rb

class Nutrient < ActiveRecord::Base 
    validates :name, uniqueness: true 

    has_many :user_nutrients 
    has_many :users, through: :user_nutrients 
end 

user_nutrient.rb

class UserNutrient < ActiveRecord::Base 
    belongs_to :user 
    belongs_to :nutrient 
end 

對於簡介，權重和programstarts dependent: :destroy作品。刪除用戶時，所有關聯的數據庫條目都將被刪除。但是，對於user_nutrientsdependent: :destroy不起作用。刪除用戶後，這些條目仍然存在。

我在這裏錯過了什麼？

Answer 1

根據這個帖子 - http://makandracards.com/makandra/32175-don-t-forget-automatically-remove-join-records-on-has_many-through-associations 你應該做到以下幾點：

has_many :user_nutrients 
has_many :nutrients, through: :user_nutrients, dependent: :destroy 

和nutrient.rb

has_many :user_nutrients 
has_many :users, through: :user_nutrients, dependent: :destroy 

Answer 2

我看你的模型關係應該是這樣的：

has_many :user_nutrients, dependent: :destroy 
has_many :nutrients, through: :user_nutrients 

我想是因爲相關的nutrient記錄被破壞，因此連接表中的記錄不能被刪除，即它們變成了孤兒。實際上，您只應在連接表中運行dependent: :destroy。

如果你仍然想破壞nutrient記錄，那麼也許在user模型