4.1.2 関係付け(アソシエーション)

• app/models/user.rb

  @@ -1,4 +1,5 @@
   class User < ApplicationRecord
  +  has_many :hujiminekos
     has_many :kouta
     has_many :takenaka_heizous

• app/models/hujimineko.rb

  @@ -1,4 +1,6 @@
   class Hujimineko < ApplicationRecord
  +  belongs_to :user
  +  has_many :documents
     exnum urgency: { none: 0, ordinary: 1, problem: 2, serious: 3, emergency: 4 }, _prefix: true

• app/models/document.rb

  @@ -1,3 +1,4 @@
   class Document < ApplicationRecord
     belongs_to :takenaka_heizou, optional: true
  +  belongs_to :hujimineko, optional: true   ← "optional: true" を付けないと validation error が出るので注意!!!
   end