Tested on ActiveRecord 5.x, 6.x.

Add this line to your application's Gemfile:

gem 'pg_inheritance'

And then execute:

$ bundle install

Or install with:

$ gem install pg_inheritance

In your migration declare iherited_from option for create_table method call:

class CreateMembers < ActiveRecord::Migration
  def change
    create_table :users do |t|
      t.string :name
    end

    create_table :members, inherits: :users do |t|
      t.string :logo_url
    end
  end
end

After migrations members has available both columns.

In your migration call drop_inheritance method.

class DropMemberUsersInheritance < ActiveRecord::Migration
  def change
    drop_inheritance :members, :users
  end
end

• with_columns - if true then inherited columns will be dropped.

If inheritance has not exists it raises an exception.