Code Explainers

Code explainers tagged #associations

ruby 
class Comment < ApplicationRecord
  belongs_to :post
  belongs_to :author, class_name: "User"
 

Live-updating comments with Turbo in Rails

turbo-streams callbacks associations
Intermediate 8 steps
ruby 
class Survey < ApplicationRecord
  has_many :questions, dependent: :destroy
  has_many :respondents, dependent: :nullify
 

Nested survey forms in Rails

nested-attributes validations associations
Intermediate 9 steps
ruby 
class CreateCommentsWithCounterCache < ActiveRecord::Migration[7.1]
  def change
    create_table :posts do |t|
      t.string :title, null: false

How counter caches work in Rails

counter-cache migrations associations
Intermediate 6 steps