WRITE FOR US

Ruby on Rails - adding a self reference in ruby on rails- ruby on rails tutorial - rails guides - rails tutorial - ruby rails

A self reference can be useful to build a hierarchical tree. This can be achieved with add_reference in a migration.

class AddParentPages < ActiveRecord::Migration[5.0]
  def change
    add_reference :pages, :pages
  end
end

Clicking "Copy Code" button will copy the code into the clipboard - memory. Please paste(Ctrl+V) it in your destination. The code will get pasted. Happy coding from Wikitechy - ruby on rails tutorial - rails guides - ruby rails - rubyonrails - learn ruby on rails - team

The foreign key column will be pages_id. If we want to decide about the foreign key column name, we have to create the column first and add the reference after.

class AddParentPages < ActiveRecord::Migration[5.0]
  def change
    add_column :pages, :parent_id, :integer, null: true, index: true
    add_foreign_key :pages, :pages, column: :parent_id
  end
end

Clicking "Copy Code" button will copy the code into the clipboard - memory. Please paste(Ctrl+V) it in your destination. The code will get pasted. Happy coding from Wikitechy - ruby on rails tutorial - rails guides - ruby rails - rubyonrails - learn ruby on rails - team

Ruby On Rails Basics

Ruby On Rails Routing

ActiveRecord Migrations

ActivRecord Validations

ActiveRecord Associations

ActiveRecord Associations

ActiveRecord Query Interface

Naming Conventions

User Authentication

Ruby on Rails Views

ActiveRecord

Configure Angular

I18n-Internationalization

Authorization with CanCan

ActiveRecord Locking

Ruby on Rails ActionMailer

Upgrading Rails

Shallow Routing

Class Organization

Ruby on Rails ActiveJob

Tools Code Optimization and Cleanup

Change a default application enviornment

Ruby on Rails Engine - Modular

Asset Pipeline

Change Default Timezone

Ruby on Rails Rails 5

Ruby on Rails Elasticsearch

Ruby on Rails ActionCable

ActiveRecord Transactions

Ruby on Rails Friendly ID

Ruby on Rails Turbolinks

Ruby on Rails Reserved Words

Ruby on Rails Rails-Engines

Ruby on Rails Mongoid

Ruby on Rails Active Jobs

Model states:AASM

Ruby on Rails Nested Form

Ruby on Rails Factory Girl

Rails frameworks over the years

Import whole CSV files from specific folder

Multipurpose ActiveRecord columns

Active Model Serializers

Rails5 API Authetication

Testing Applications

Payment feature in rails

Rails On docker

Authenticate Api using Devise

Ruby on Rails Prawn PDF

Ruby on Rails ActiveSupport

Single Table Inheritance

RSpec and Rails

Ruby on Rails Form Helpers

Ruby on Rails Configuration

React with Rails using react-rails gem

Deploying a Rails app on Heroku

Securely storing authentication keys

Decorator pattern

Ruby on Rails Rails logger

Ruby on Rails Gems

Ruby on Rails File Uploads

Ruby on Rails Caching

Ruby on Rails Rails-API

ActiveRecord Transactions

Ruby on Rails Configuration

Using GoogleMaps with Rails

Safe Constantize

Rails generate commands

Ruby on Rails ActiveModel

Ruby on Rails Add Admin Panel

Integrating React.js with Rails Using Hyperloop

Ruby on Rails
ActionController

Cookbook-Advanced rails recipes/learnings and coding techniques

ActiveRecord TransactionsAdding an Amazon RDS to our application

This ruby on rails tutorial page provides you the following key areas such as ruby , rail , ruby on rails , rail forum , ruby on rails tutorial , ruby tutorial , rails guides , rails tutorial , learn ruby , rails form_for , ruby rails , ruby class , what is ruby on rails , rails installer , ruby online , learn ruby on rails , ruby on rails jobs , rails find_by , install rails , easyrail , rubyonrails , link_to rails , ruby on rails developer , learn ruby the hard way , railscasts , ruby on rails examples , ruby on rails vs php , rails 4 , rails activerecord , rails generate , ruby and rails , ruby on rails download , install ruby on rails , ruby net http , what is rails , ruby app , ruby vs ruby on rails , ruby on rails windows , rails for zombies , ruby on rails book , ruby on rails development , ruby on rails ide , ruby on rails tutorial pdf

Related Searches to adding a self reference in ruby on rails

rails self referential has_many throughrails self joinsrailscast self referential associationrails model has_many of itselfrails following usershas_many through railscastrails self join queryfactory girl reference self