Rails Migration with adding and removing reference

Rails 4.2.1

rails g migration RemoveClientFromUsers client:references

Will generate a migration similar:

class RemoveClientFromUser < ActiveRecord::Migration
  def change
    remove_reference :users, :client, index: true, foreign_key: true
  end
end

In addition, one is at liberty to add another or other reference(s) by adding:

add_reference :users, :model_name, index: true, foreign_key: true

within the very change method. And finally running rake db:migrate after saving the changes to the migration, will produce the desired results.

that is right! and you could also go with:

  def self.down
      remove_column :users, :client_id
  end