Handling Nested Routes - Categories/ Drinks Example

Nested_Routes_Example.rb

  
  # This index handler lets you navigate to the following routes: 
      #category_drinks | GET | /categories/:category_id/drinks(.:format) | drinks#index
      # drinks         | GET | /drinks(.:format)                         | drinks#index
  # and... 
  def index
    if params.include?('category_id')
      category = Category.find(params[:category_id])
      @drinks = Drink.where(category: category).page(params[:page])
    else
      @drinks = Drink.page(params[:page])
    end

    # if params.include?('category_id')
    # @drinks = Drink.find(params[:category_id])
    # else
    # @drinks = Drink.page(params[:page])
    # end
  end
  
  

Routes.rb

Rails.application.routes.draw do
  root 'homes#index'
  resources :drinks
  resources :categories, only: [] do
    resources :drinks
  end
end

test_spec.rb

require 'rails_helper'

feature 'visitor views categorized drinks', %Q{
  As a visitor
  I want to view drinks for a given category
  So that I can make a drink that fits within that category
} do
  # Acceptance Criteria
  #
  # * I can navigate to a drink listing for a given category
  # * On the category listing, I should only see drinks that fall within that
  #   category
  # * For nonexistant categories, a drink listing should not exist
  #
  let(:category) { FactoryGirl.create(:category) }

  scenario 'drink in category is found on the category listing' do
    drink = FactoryGirl.create(:drink, category: category)

    visit '/categories/' + category.to_param + '/drinks'
    expect(page).to have_content(drink.title)
  end

  scenario 'drink not in category is not found on the category listing' do
    drink = FactoryGirl.create(:drink)

    visit '/categories/' + category.to_param + '/drinks'
    expect(page).to_not have_content(drink.title)
  end
end