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.