Rails application architecture?

Question

MongoDB

Given: Rails 3.1, Devise, Mongoid
Need: somehow organize two types of users - Client and Developer, both should have different parameters in the profile. But everyone should be able to login through one form.
There are several ideas, for example - the Client and the Developer are different models, but each embed (embeds) User model.
Or the Client and the Developer are inherited from the User.
Question on StackOverflow

Answer 1

Single table inheritance might work for you
StackOverflow question

Answer 2

Imagine that the project grows and it will be necessary for the user to be both a customer and a performer (for example, a webmaster developer orders a design from a designer contractor). You will need a bike to synchronize the two models.
Take one user model, roles from cancan, here is a tutorial, there are plenty of attributes so that there are enough custom validators for all roles - what type of user can have which attributes. The form from devise will automatically turn out one.
Although one form can be drawn through partial, put the required object in : locales, if there are fields that are used in the form, everything will work out.

Answer 3

There was an article on Habré about polymorphic models and Devise :) as an option to do so.
I made one model and a connection for additional. user fields depending on the type of user.