CODEWITHSUNDEEP
ruby-on-railsruby-on-rails-4
user1175969
user1175969

Reputation: 570

Two levels of HABTM associations

I have the classes Student, Classroom and Course. A Student has and belongs to many classrooms, and a Classroom has and belongs to many courses.

How do I retrieve all the courses associated with a Student? Also, how do I retrieve all students associated with a course?

Thanks!

Upvotes: 0

Views: 35

Answers (1)

Pholochtairze
Pholochtairze

Reputation: 1854

Use has_many ... :through in your model (models/student.rb):

has_many :courses, :through => :classrooms   
has_many :classrooms

Then you can use :

student.courses

Some useful stackoverflow link : When should one use a "has_many :through" relation in Rails?

Upvotes: 1

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