ruby-on-rails - class_instruction 中的学生和教师

Question

设置数据库，我只是好奇我是否做得正确，因为它看起来有点不对劲。有些人拥有用户帐户和角色(教师或学生)。他们是类(class)的参与者(一个类(class)有许多学生和老师；一个学生有很多类(class)；一个老师有很多类(class))。我认为我的 class_instruction 模型在数据库中已关闭，但请告诉我它是否有效，或者是否有更好的方法(例如可能使用 has_many_through 参与者表)

架构.rb:

ActiveRecord::Schema.define(:version => 20130524160107) do

  create_table "class_instructions", :force => true do |t|
    t.string   "name"
    t.datetime "time"
    t.datetime "created_at", :null => false
    t.datetime "updated_at", :null => false
    t.integer  "person_id"
  end

  add_index "class_instructions", ["person_id"], :name => "index_class_instructions_on_person_id"

  create_table "people", :force => true do |t|
    t.string   "firstName"
    t.string   "lastName"
    t.integer  "user_id"
    t.datetime "created_at", :null => false
    t.datetime "updated_at", :null => false
  end

  add_index "people", ["user_id"], :name => "index_people_on_user_id"

  create_table "roles", :force => true do |t|
    t.string   "name"
    t.datetime "created_at", :null => false
    t.datetime "updated_at", :null => false
  end

  create_table "user_roles", :force => true do |t|
    t.integer  "user_id"
    t.integer  "role_id"
    t.datetime "created_at", :null => false
    t.datetime "updated_at", :null => false
  end

  add_index "user_roles", ["role_id"], :name => "index_user_roles_on_role_id"
  add_index "user_roles", ["user_id"], :name => "index_user_roles_on_user_id"

  create_table "users", :force => true do |t|
    t.string   "email",                  :default => "", :null => false
    t.string   "encrypted_password",     :default => "", :null => false
    t.string   "reset_password_token"
    t.datetime "reset_password_sent_at"
    t.datetime "remember_created_at"
    t.integer  "sign_in_count",          :default => 0
    t.datetime "current_sign_in_at"
    t.datetime "last_sign_in_at"
    t.string   "current_sign_in_ip"
    t.string   "last_sign_in_ip"
  end

  add_index "users", ["email"], :name => "index_users_on_email", :unique => true
  add_index "users", ["reset_password_token"], :name => "index_users_on_reset_password_token", :unique => true

end

我担心的是 person_id 是类(class)的一部分。这是正确的吗？

类指令.rb:

class ClassInstruction < ActiveRecord::Base
  belongs_to :people
  has_many :cassignments
  has_many :assignments, :through => :cassignments

  def className
    self.name
  end

  def classAssignments
    return self.cassignments
  end
end

Answer 1

我会制作一个既有类又有人员的连接表，并且用途有很多。如果人们有很多类(class)，并且类(class)有很多人，那么您就无法以其他方式做到这一点。