Enhance/#48 aad foreign key to comments

backend/app/models/comment.rb

@@ -8,12 +8,16 @@
 #  content(内容)   :text(65535)      not null
 #  created_at      :datetime         not null
 #  updated_at      :datetime         not null
-#  memo_id(メモID) :integer          not null
+#  memo_id(メモID) :bigint           not null
 #
 # Indexes
 #
 #  index_comments_on_memo_id  (memo_id)
 #
+# Foreign Keys
+#
+#  fk_rails_...  (memo_id => memos.id)
+#
 class Comment < ApplicationRecord
   validates :content, presence: true
   belongs_to :memo

backend/db/Schemafile

@@ -13,9 +13,11 @@ create_table 'memos', charset: 'utf8mb4', collation: 'utf8mb4_0900_ai_ci', force
 end
 
 create_table 'comments', charset: 'utf8mb4', collation: 'utf8mb4_0900_ai_ci', force: :cascade do |t|
-  t.integer "memo_id", null: false, comment: 'メモID'
+  t.bigint "memo_id", null: false, comment: 'メモID'
   t.text "content", null: false, comment: '内容'
   t.datetime "created_at", null: false
   t.datetime "updated_at", null: false
   t.index ["memo_id"], name: "index_comments_on_memo_id"
 end
+
+add_foreign_key 'comments', 'memos'

backend/spec/factories/comments.rb

@@ -8,12 +8,16 @@
 #  content(内容)   :text(65535)      not null
 #  created_at      :datetime         not null
 #  updated_at      :datetime         not null
-#  memo_id(メモID) :integer          not null
+#  memo_id(メモID) :bigint           not null
 #
 # Indexes
 #
 #  index_comments_on_memo_id  (memo_id)
 #
+# Foreign Keys
+#
+#  fk_rails_...  (memo_id => memos.id)
+#
 
 FactoryBot.define do
   factory :comment do

backend/spec/models/comment_spec.rb

@@ -8,12 +8,16 @@
 #  content(内容)   :text(65535)      not null
 #  created_at      :datetime         not null
 #  updated_at      :datetime         not null
-#  memo_id(メモID) :integer          not null
+#  memo_id(メモID) :bigint           not null
 #
 # Indexes
 #
 #  index_comments_on_memo_id  (memo_id)
 #
+# Foreign Keys
+#
+#  fk_rails_...  (memo_id => memos.id)
+#
 RSpec.describe Comment do
   subject(:comment) { build(:comment) }