Add circle editor

db/migrate/20230821061713_create_circles.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+class CreateCircles < ActiveRecord::Migration[7.0]
+  def change
+    create_table :circles do |t|
+      t.belongs_to :account, null: false, foreign_key: { on_delete: :cascade }
+      t.string :title, null: false, default: ''
+      t.datetime :created_at, null: false
+      t.datetime :updated_at, null: false
+    end
+    create_table :circle_accounts do |t|
+      t.belongs_to :circle, null: true, foreign_key: { on_delete: :cascade }
+      t.belongs_to :account, null: false, foreign_key: { on_delete: :cascade }
+      t.belongs_to :follow, null: false, foreign_key: { on_delete: :cascade }
+      t.datetime :created_at, null: false
+      t.datetime :updated_at, null: false
+    end
+
+    add_index :circle_accounts, [:circle_id, :account_id], unique: true
+  end
+end