[3] pry(#<V1::EnrollmentsController>)> enrollment.save
   (0.2ms)  BEGIN
  SQL (2.1ms)  INSERT INTO "enrollments" ("created_at", "registration_id", "school_class_id", "status", "unlimited", "updated_at") VALUES ($1, $2, $3, $4, $5, $6) RETURNING "id"  [["created_at", "2014-07-22 19:50:56.645823"], ["registration_id", 11], ["school_class_id", 8], ["status", "active"], ["unlimited", "t"], ["updated_at", "2014-07-22 19:50:56.645823"]]
   (2.9ms)  COMMIT
=> true
[4] pry(#<V1::EnrollmentsController>)> student === enrollment.registration.student.reload
  Student Load (0.9ms)  SELECT  "users".* FROM "users"  WHERE "users"."type" IN ('Student') AND "users"."id" = $1 LIMIT 1  [["id", 23]]
=> true