Querying a model by a has many through association

Question

I need to query my model by an associated model.

Pseudo code: @drinks = Drink.where(drink.ingredients ARE IN cabinet.ingredients)

Drink Model

class Drink < ActiveRecord::Base
  attr_accessible :name

  has_many :recipe_steps, :dependent => :destroy
  has_many :ingredients, through: :recipe_steps
end

Ingredient Model

class Ingredient < ActiveRecord::Base
  attr_accessible :name

  has_many :recipe_steps
  has_many :drinks, through: :recipe_steps
  has_many :cabinet_ingredients
  belongs_to :cabinet
end

User Model

class User < ActiveRecord::Base

  has_one :cabinet
end

Edit: As suggested I tried

Drink.joins(ingredients: :cabinet_ingredients)

However it returns multiple records of the same drink when I have one drink with 2 ingredients from my cabinet and/or multiple users.

I need to return only one record of the drink.. In addition, I need to only return a drink if all of its ingredients are matched in the cabinet

Answer 1

Here is how I would do it. Select a drink if all its ingredients are present in the given cabinet's ingredients. I know its not using Drink.where like your pseudo code but it would get the job done.

Drink.all.select{|drink| drink.ingredients.all?{|drink_ingredient| cabinet.ingredients.include?(drink_ingredient)}}

Answer 2

尝试这个。

Drink.joins(ingrediants: :cabinet_ingredients).uniq