Extend a rails model using another class

I'm writing a gem that I want to extend a model. I tried defining the class in my gem as:

class UserModel < ActiveRecord::Base

and then the user model as:

class User < Adauth::UserModel

But this caused Active Record to throw up a table not found 开发者_开发知识库error as it was using UserModel not User for the model name.

I can't specify the the model name as I intend to have a named generator create the model with User as the default.

I'm assuming that it isnt possible to inherit from 2 classes/modules in the definition line so how would I import all the methods from Adauth::UserModel into a model?

I don't know if this is the best solution for your problem, but you could try using mixins.

Define a module UserModel with all the methods you want.

module Adauth
  module UserModel
    # methods go here
  end
end

and then when you define your model:

class User < ActiveRecord::Base
  include Adauth::UserModel
end