remove_users_userid.rb

class RemoveUsersUserid < ActiveRecord::Migration
  def self.up
    change_table :users do |t|
      t.remove :userid
    end
  end

  def self.down
    change_table :users do |t|
      t.integer :userid
    end
  end
end

rename_connections_type.rb

class RenameConnectionsType < ActiveRecord::Migration
  def self.up
    change_table :connections do |t|
      t.rename :type, :kind
    end
  end

  def self.down
    change_table :connections do |t|
      t.rename :kind, :type
    end
  end
end