ruby - Rails 4: having a proxy model to combine multiple models -

i trying hand on rails (4). have done sinatra earlier.

i have signup form, in user can fill out organization name, address , own name, password etc. have 2 tables - users , organizations, table populated signup data. so, have 2 active records model users , organizations. controllers looks follows:

class signupscontroller < applicationcontroller    # /signup   def new     # show html form   end    # post /signup   def create     @signup = registration.register(signup_params)     respond_to |format|       if @signup.save         format.html { redirect_to @signup, notice: 'signup created.' }       else         format.html { render action: 'new' }       end     end   end    private     # never trust parameters scary internet, allow white list through.     def signup_params       params[:signup]     end end 

i not have registration model (table in db). looking such registration model (should call model?) can have like:

class registration   def self.register params     o = organization.new params     u = user.new o.id, params     self.send_welcome_email params[:email]   end    def send_welcome_email email     #send email here   end end 

1) should keep registration class?

2) correct approach such situation? if not, best way it?

3) having such class effect running unit tests?

4) see there file, signup_helper.rb use of in signupscontroller

you can include activemodel::model in model, , behave normal model. able validations, callbacks. other persisting database.

have @ this more info.