liln/cookbook

example of has_many :through association

Cookbook Application

By Lillian Ng

This application uses Rails 4.

Description

This cookbook application lets you add and explore recipes. It is an example of a has_many :through relationship using nested forms. New recipes include fields to enter measurements and ingredients. Ingredients do not replicate if they are already in the database.

Models

class Recipe < ActiveRecord::Base
  has_many :measurements
  has_many :ingredients, :through => :measurements
end

class Measurement < ActiveRecord::Base
  belongs_to :recipe
  belongs_to :ingredient
end

class Ingredient < ActiveRecord::Base
  has_many :measurements
  has_many :recipes, :through => :measurement
end

Recipe stores: name, servings, and directions

Measurement stores: ingredient_unit and ingredient_size

Ingredient stores: name and many booleans for tracking lactose, nut, shellfish, wheat, vegetarian, vegan

Known Issues and Bugs

Tests have not been written :(

Nested forms have awkward behavior - sometimes the add link does not add fields to enter more ingredients

Different spelling/capitalization/plural ingredients will be replicated.

Ingredients that are linked to recipes can be deleted. This should not actually happen...

Particularly Helpful Posts

http://www.gitmatt.com/posts/5 - a starting point for has_many :through associations

awesome_nested_fields

From stackoverflow.com Rails has_many :through Nested Form

accepts_nested_attributes_dor with find_or_xreate