has_many的使用技巧
| + def main_manager |
| + creator |
| + end |
| + |
| module UserMethods |
| def self.included(base) |
| - base.has_many :course_subjects |
| + base.has_many :created_course_subjects, :class_name => "CourseSubject", |
| + :foreign_key => :creator_id |
| end |
| end |
| def add_course(course, user) |
| - return if _check_user(user) || self.course_subject_courses.by_course(course).first |
| + return if !self.is_manager?(user) || self.courses.include?(course) |
| self.course_subject_courses.create(:course => course, :manager_id => user.id) |
| end |
| def remove_course(course, user) |
| - return if _check_user(user) |
| - course_subject_course = self.course_subject_courses.by_course(course).first |
| - course_subject_course.destroy if course_subject_course |
| + return if !self.is_manager?(user) |
| + self.course_subject_courses.by_course(course).destroy_all |
| + end |
| + |
| + def is_manager?(user) |
| + self.main_manager == user || self.secondary_managers.include?(user) |
| end |
| - private |
| - def _check_user(user) |
| - course_subject_course = self.creator.id == user.id |
| - course_subject_managership = self.course_subject_managerships.by_user(user).first |
| - return true if !(course_subject_course || course_subject_managership) |
| - end |
| end |
| def user_check |
| if self.user_id == self.course_subject.creator_id |
| - errors.add :base, 'course_subject_managerships.user_id == course_subject.creator_id' |
| + errors.add :base, '不能把主管理员设置为副管理员' |
| end |
| end |
| def self.included(base) |
| base.has_many :course_subject_managerships |
| - base.has_many :managers, :through => :course_subject_managerships, :source => :user |
| + base.has_many :secondary_managers, :through => :course_subject_managerships, :source => :user |
| end |
| def remove_manager(user) |
| - course_subject_managership = self.course_subject_managerships.by_user(user).first |
| - course_subject_managership.destroy if course_subject_managership |
| + self.course_subject_managerships.by_user(user).destroy_all |
| end |
| def self.included(base) |
| base.has_many :course_subject_managerships |
| # user作为副管理员的课程主题 |
| - base.has_many :course_subjects, :through => :course_subject_managerships |
| + base.has_many :manage_course_subjects, :through => :course_subject_managerships, :source => :course_subject |
| end |