CODEWITHSUNDEEP
ruby-on-rails
Noam B.
Noam B.

Reputation: 3250

Define relationship between 2 models

I have a CourseSession model. Each CourseSession has some lessons.

I would like to call: lesson.course_session and get the CourseSession that refers to the lesson.

I don't want to use a foreign key in order to practice rails.

How can I connect between them? Every Lesson has a unique effective_date column that coresponds to an effective_date in the CourseSession model.

So how do I define the associations in order to achieve lesson.course_session?

Upvotes: 0

Views: 86

Answers (1)

Tiago Farias
Tiago Farias

Reputation: 3407

It is possible, I guess, but not an advised approach. If it's for the sake of learning something new, go ahead. But anyway, in the Lesson model, use:

belongs_to :course_session, primary_key: :effective_date, foreign_key: :effective_date

And in CourseSession:

has_many :lessons, primary_key: :effective_date, foreign_key: :effective_date

Found a post here talking about this: Belongs_to primary key?

Take a look at https://apidock.com/rails/ActiveRecord/Associations/ClassMethods/belongs_to under Options/:primary_key

Upvotes: 1

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