康康舞accessible_by
当我这样做时到底发生了什么：
@patient.course_enrollments.accessible_by(current_ability)
似乎发生的是我得到了 course_enrollments，其中 course.client_id = user.client.id，我只是不明白 accessible_by 是如何工作的。
# ability.rb
can :manage, CourseEnrollment, :course => {:client_id => user.client.id}
What exactly is happening when I do:
@patient.course_enrollments.accessible_by(current_ability)
What seems to happen is I get course_enrollments where course.client_id = user.client.id, I just don't understand how accessible_by works.
# ability.rb
can :manage, CourseEnrollment, :course => {:client_id => user.client.id}
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accessible_by为您提供了一个范围，其中仅包含您在给定current_ability的情况下能够访问的记录。由于您声明CourseEnrollment上的:manage功能是按当前用户拥有的课程进行过滤的，因此accessible_by调用将添加相同的限制这样返回的课程注册将全部可供当前用户“访问”。accessible_bygives you a scope that includes only those records which you'd be able to access given thecurrent_ability. Since you stated that the:manageability onCourseEnrollmentis filtered by courses owned by the current user, theaccessible_bycall will add in that same restriction so that the course enrollments returned will all be "accessible by" the current user.