01 - Cookbook

controller.rb

# Requiring it because Rake tests controllers
# individually
require_relative 'view'
require_relative 'recipe'

class Controller
  def initialize(cookbook)
    @cookbook = cookbook
    @view = View.new
  end

  # CRUD: Read
  # List recipes
  def list
    show_recipes
  end


  # CRUD: Create
  def create
    name = @view.ask_for_name
    description = @view.ask_for_description
    recipe = Recipe.new(name, description)

    @cookbook.add_recipe(recipe)
  end


  # CRUD: Delete
  def destroy
    show_recipes # => calling the private method

    recipe_index = @view.delete_recipe

    @cookbook.remove_recipe(recipe_index)
  end

  private
  # defining a method that has a common behavior
  # so we can reuse it inside other methods
  def show_recipes
    recipes = @cookbook.all
    @view.list_recipes(recipes)
  end
end

cookbook.rb

# This class is the repository,
# where we store things and define methods
# related to storing/retrieving

require 'csv'
require_relative 'recipe'

class Cookbook

  # This method initializes with a path
  # to a csv file (see router.rb)
  def initialize(filepath)
    @recipes = []
    @filepath = filepath

    # At the start, we get all recipes from CSV
    # and transform them to Recipe objects 
    # So listing them works just fine
    CSV.foreach(@filepath) do |row|
      @recipes << Recipe.new(row[0], row[1])
    end
  end


  # Just return all recipes (instance method)
  def all
    @recipes
  end


  # Add a recipe to the Recipes Array
  def add_recipe(recipe)
    @recipes << recipe

    # This method saves the recipe to the CSV
    # after we add it to the array
    write_recipes # reusing a common instruction
  end


  # Remove a recipe from the Recipes Array
  # and update the CSV afterwards
  def remove_recipe(recipe_index)
    @recipes.delete_at(recipe_index)

    write_recipes # reusing a common instruction
  end

  private

  # Common instruction: it updates the CSV
  # 
  def write_recipes
    CSV.open(@filepath, 'wb') do |csv|
      @recipes.each do |recipe|
        csv << [recipe.name, recipe.description]
      end
    end
  end
end

recipe.rb

class Recipe

  # define that :name and :description 
  # can be read, but no written
  attr_reader :name, :description

  def initialize(name, description)
    @name = name
    @description = description
  end
end

view.rb

# This class is responsible for only:
# Displaying (puts) and 
# Receiving (gets) user inputs/outputs


# ITS only related to recipes controller
class View
  def list_recipes(recipes)
    if recipes.empty?
      puts "You have no recipes!!"
    else
      recipes.each_with_index do |recipe, index|
        puts "#{index + 1} - #{recipe.name} (#{recipe.description})"
      end
    end
  end

  def ask_for_name
    puts "What's the name of your recipe?"
    print "> "
    gets.chomp
  end

  def ask_for_description
    puts "What's the description of your recipe?"
    print "> "
    gets.chomp
  end

  def delete_recipe
    puts "What recipe do you want to delete?"
    print "> "
    gets.chomp.to_i - 1
  end
end