#1 #2 #4 バックエンド資産作成

backend/app/models/application_record.rb

@@ -0,0 +1,3 @@
+class ApplicationRecord < ActiveRecord::Base
+  primary_abstract_class
+end

backend/app/models/legacy_base.rb

@@ -0,0 +1,4 @@
+class LegacyBase < ActiveRecord::Base
+  self.abstract_class = true
+  establish_connection :legacy_bbs
+end

backend/app/models/legacy_response.rb

@@ -0,0 +1,3 @@
+class LegacyResponse < LegacyBase
+  self.table_name = 'responses'
+end

backend/app/models/legacy_thread.rb

@@ -0,0 +1,3 @@
+class LegacyThread < LegacyBase
+  self.table_name = 'threads'
+end

backend/app/models/post.rb

@@ -0,0 +1,8 @@
+class Post < ApplicationRecord
+  belongs_to :thread, class_name: 'Topic', foreign_key: :thread_id
+  has_one_attached :image
+
+  has_secure_password validations: false
+
+  scope :active, -> { where deleted_at: nil }
+end

backend/app/models/topic.rb

@@ -0,0 +1,9 @@
+class Topic < ApplicationRecord
+  self.table_name = 'threads'
+
+  has_many :posts, foreign_key: :thread_id, dependent: :destroy
+
+  scope :active, -> { where deleted_at: nil }
+
+  validates :name, presence: true
+end