Rails model has_many :through relationship

Question

User , Car , Part , Tire . User has many Car s. Car has many Part s. Part has many Tire s.

In user.rb, I have

has_many :tires, through: :cars

However, it seems like this is not a correct way of doing it since there is another model Part in the middle.

How should I successfully do to make has_many relationships between User and Tire ?

Answer 1

You just need to add the connection in the middle.

# User.rb
has_many :cars
has_many :parts, through: :cars
has_many :tires, through: :parts