掲示板実装

db/migrate/20260218084842_create_board_memberships.rb

@@ -0,0 +1,19 @@
+class CreateBoardMemberships < ActiveRecord::Migration[8.1]
+  def change
+    create_table :board_memberships do |t|
+      t.integer :board_id, null: false
+      t.integer :participant_id, null: false
+      t.datetime :joined_at, null: false
+      t.datetime :left_at
+      t.integer :last_read_post_id
+
+      t.timestamps
+    end
+
+    add_index :board_memberships, :board_id
+    add_index :board_memberships, :participant_id
+    add_index :board_memberships, [ :board_id, :participant_id ], unique: true
+    add_foreign_key :board_memberships, :boards
+    add_foreign_key :board_memberships, :participants
+  end
+end