I have the following tables: courses, students, and rosters.  The
rosters table references the courses and students tables.  With
default routes in place, to list the students in a course I would use:
http://localhost:3000/rosters/list

but this lists the rosters for all courses.

if I use http://localhost:3000/rosters/list/1

rails looks in the rosters table for entry with the id =1.  How do I
tell it I want all the entries where course_id = 1?

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