Question

I have these 3 models:

class Car < ActiveRecord::Base
  belongs_to :user
  has_many :car_styles
  has_many :styles, :through => :car_styles
end


class CarStyle < ActiveRecord::Base
  belongs_to :car
  belongs_to :style
end


class UserStyle < ActiveRecord::Base
  belongs_to :style
  belongs_to :user  
end


class User < ActiveRecord::Base     
  has_many :cars

  has_many :car_styles
  has_many :styles, :through => :car_styles

end

I have logged-in a user (current_user). I am trying to select all cars, where car style_id are the same like user style_id — how can I do that?

Thanks for help in advance

EDIT: schema:

cars

-id
-user_id

car_styles

-car_id
-style_id

user_styles

-user_id
-style_id

Every user has saved favorite styles – doesn’t matter how much (but approximately ±5). Every photo has added a styles as well – and again doesn’t matter how much.

And I would like to select all cars from table Cars, which have the same styles, as the current_user has added.

Answer 1

I think what you’re saying here is you have three main models:

Car, User and Style

CarStyle and UserStyle are joins right?

If so, you should be able to say:

Car.joins(:styles => [:users]).where(:users => {:id => current_user.id })

If not, could you update the question with your schema?