Rails 3 equivalent of complex SQL query

Posted by Bryan on Stack Overflow See other posts from Stack Overflow or by Bryan
Published on 2010-06-15T03:16:30Z Indexed on 2010/06/15 3:22 UTC
Read the original article Hit count: 354

Given the following models:

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

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

class Ingredient < ActiveRecord::Base
end

How can I perform the following SQL query using Arel in Rails 3?

SELECT * FROM recipes WHERE NOT EXISTS (
  SELECT * FROM ingredients WHERE 
    name IN ('chocolate', 'cream') AND 
    NOT EXISTS (
      SELECT * FROM recipe_ingredients WHERE 
        recipe_ingredients.recipe_id = recipes.id AND 
        recipe_ingredients.ingredient_id = ingredients.id))

© Stack Overflow or respective owner

Related posts about ruby-on-rails

Related posts about ruby-on-rails3