educoder/app/models/school.rb

class School < ApplicationRecord
  has_many :departments, dependent: :destroy

  has_many :shixun_schools, :dependent => :destroy
  has_many :shixuns, :through => :shixun_schools

  has_many :ec_school_users, :dependent => :destroy
  has_many :users, :through => :ec_school_users

  has_many :ec_major_schools, :dependent => :destroy
  has_many :ec_majors, :through => :ec_major_schools

  # 学校管理员
  def manager?(user)
    ec_school_users.exists?(user_id: user.id)
  end

  # 专业管理员
  def major_manager?(user)
    relations = ec_major_schools.not_template.joins(:ec_major_school_users)
    relations.exists?(ec_major_school_users: { user_id: user.id })
  end

  # 课程管理员
  def course_manager?(user)
    relations = ec_major_schools.not_template.joins(ec_years: :ec_course_users)
    relations.exists?(ec_course_users: { user_id: user.id })
  end

  def manage_permission?(user)
    manager?(user) || major_manager?(user) || course_manager?(user)
  end
end