How to get ids from a nested resource?

How do i access ids from a nested resource ?There is no id people_id in@peoples=@city.peoples.i get an error Couldn't find People without an ID.Thank you in advance.

Models

    class City < ActiveRecord::Base
    has_many :peoples 
    end

   class People < ActiveRecord::Base
   belongs_to :city
   end 

controller

  def show
  @city = City.find(session[:city_id])
  @peoples=@city.peoples
  @people=@peoples.find(params[:id])
  end

Routes

   resources :city, :people
   resources开发者_运维百科 :cities do
   resources :peoples  
   end 

Your error message refers to model Deal, but your example refers to City and children People. Anyhow, each People instance in @Peoples (or @city.peoples) should have its ID attribute available as id -- not people_id.

I think your problem stems from this line

@people = @peoples.find(params[:id])

Are you sure you set params[:id]? How are you linking to your show action?

Also I don't think you can call find on the instance variable @peoples as I think it is an array, but I could be wrong.