rails model dependent
1 Why Associations? In Rails, an association is a connection between two Active Record models. ... has_many :books , dependent: :destroy. end. class Book < ... ,1 Why Associations? In Rails, an association is a connection between two Active Record models. ... has_many :books , dependent: :destroy. end. class Book < ... ,class Project < ActiveRecord::Base belongs_to :portfolio has_one ...... has_many, has_one, and belongs_to associations support the :dependent option. ,Destroying Dependent Models. 1:27 with Jay McGavren. If you destroy a record that has_many associated records, by default, those associated records will be ... , Add cascading delete to your EmpGroup model: class EmpGroup < ActiveRecord::Base has_many :emp_group_members, :dependent ..., If set to :restrict this object raises an ActiveRecord::DeleteRestrictionError exception and cannot be deleted if it has any associated objects.,apparently https://github.com/rails/rails/issues/3458 other options were ... is to catch the database-level failure and raise ActiveRecord::InvalidForeignKey . , Rails polymorphic associations，多型態連結，即一個model有可能和多個model ... has_many :joins, foreign_key: "joined_id", dependent: :destroy.,在「ActiveRecord - 基本操作與關聯設計」一章我們已經有了關聯設計的基本 ... class Event < ApplicationRecord has_many :attendees, :dependent => :destroy end.
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 rails model dependent 相關參考資料
Active Record Associations - Rails Edge Guides - Ruby on Rails
1 Why Associations? In Rails, an association is a connection between two Active Record models. ... has_many :books , dependent: :destroy. end. class Book < ... https://edgeguides.rubyonrails Active Record Associations — Ruby on Rails Guides
1 Why Associations? In Rails, an association is a connection between two Active Record models. ... has_many :books , dependent: :destroy. end. class Book < ... https://guides.rubyonrails.org ActiveRecord::Associations::ClassMethods - Rails API - Ruby on Rails
class Project < ActiveRecord::Base belongs_to :portfolio has_one ...... has_many, has_one, and belongs_to associations support the :dependent option. https://api.rubyonrails.org Destroying Dependent Models | Active Record Associations in Rails ...
Destroying Dependent Models. 1:27 with Jay McGavren. If you destroy a record that has_many associated records, by default, those associated records will be ... https://teamtreehouse.com How to use dependent: :destroy in rails? - Stack Overflow
Add cascading delete to your EmpGroup model: class EmpGroup < ActiveRecord::Base has_many :emp_group_members, :dependent ... https://stackoverflow.com Rails :dependent => destroy, want to call another action instead ...
If set to :restrict this object raises an ActiveRecord::DeleteRestrictionError exception and cannot be deleted if it has any associated objects. https://stackoverflow.com Rails dependent which options are possible? - Stack Overflow
apparently https://github.com/rails/rails/issues/3458 other options were ... is to catch the database-level failure and raise ActiveRecord::InvalidForeignKey . https://stackoverflow.com Rails polymorphic associations — Kimix 金觀點
Rails polymorphic associations，多型態連結，即一個model有可能和多個model ... has_many :joins, foreign_key: "joined_id", dependent: :destroy. http://kimix.name Ruby on Rails 實戰聖經| ActiveRecord - 資料表關聯
在「ActiveRecord - 基本操作與關聯設計」一章我們已經有了關聯設計的基本 ... class Event < ApplicationRecord has_many :attendees, :dependent => :destroy end. https://ihower.tw |