Good way to create model which generates something in Rails

There is a model A, which have some fields in database and some relationships. Action .create() for this model doesn't get direct data from user:

• User sets some params at .new() form, model generates some data
• Render STEP1
• User modifies this data if he wants and runs final generation.
• Result of final generation stores in database and renders to user.

How this scenario can be applied to MVC and Ruby on Rails?

Update

I have a model, named Route and /search form. At /se开发者_Go百科arch a user can specify his favorite cities and countries for Route.

Some half-random generator selects some suitable cities for user, solving TSP and render it on google map.

This is step 1.

User can further edit this pre-route and click "Continue". The generator should find some suitable places in selected cities.

That's all.

https://github.com/search?langOverride=Ruby&q=wizard&repo=&start_value=1&type=Repositories