forms - Rails Models Design Decision -

so simplify have, there 3 main models in application; city, restaurant , recipe. city has many restaurants , restaurant has many recipes. every city has page lists restaurants in city , every restaurant page has recipes listed in page. there "add new restaurant" button in city page, when user clicks on user taken new restaurant page following link:

<%= link_to 'add new restaurant', new_restaurant_path %> 

but page generic page user can add restaurant city, how modify design that, new restaurant form add new restaurant city.

edit: answers. restaurant create method right now.. because new_restaurant_path form , has other params city. understand can figure out city of restaurant doing @city = city.find(params[:city]) how add rest of params in line @restaurant = restaurant.new(params[:restaurant])

def create     @restaurant = restaurant.new(params[:restaurant])    end 

with routes

you can create route this:

/cities/:city_id/restaurants/new 

with:

resources :city   resources :restaurants end 

and helper:

<%= link_to 'add new restaurant', new_city_restaurant_path(city) %> 

with params in helper

or can pass parameter in current route helper , handle in controller:

<%= link_to 'add new restaurant', new_restaurant_path(city_id: city.id) %> 

this make use url:

/restaurants/new?city_id=123 

for both approaches, controller

and in controller:

def create   city = city.find(params[:city_id])   @restaurant = city.restaurants.build params[:restaurant]   if @restaurant.save     ... end