Rails 3. How to find an associated model through another model?

Question

I have these models: Expenses, ScheduledCourses and ScheduledSessions.

scheduled_courses has_many scheduled_sessions
scheduled_sessions belongs_to scheduled_courses

expenses has_many scheduled_sessions
scheduled_sessions belongs_to expenses

I need to find all the expenses associated with a particular scheduled_course. But the expenses have a scheduled_session_id not a scheduled_course_id.

How could I do that?

Answer 1

预定课程：

has_many :expenses, :through => :scheduled_sessions