Rails 3. sort by associated model

Question

Let\'s say I have two models: Course and ScheduledCourse.

The Course model has a name attribute.

course has_many :scheduled courses scheduled_courses :belongs_to

Answer 1

Try...

ScheduledCourse.joins(:course).order('course.name')

If this doesn't work, you may need to call .all before your joins condition, like so:

ScheduledCourse.all.joins(:course).order('course.name')

Like luacassus said, this answer can help; I think the syntax in that answer is pre-Arel (ActiveRecord 3), but it'll get the job done. Hope that helps!

EDIT:

As mentioned by @FellowStranger, the correct syntax nowadays seems to be

ScheduledCourse.joins(:course).order('courses.name')

Answer 2

ScheduledCourse.joins(:course).order('courses.name asc')

Note that the table name should be in plural. This code is tested.