学生和班级老师

建立数据库，我只是好奇，如果我做得正确，因为它看起来有点关闭。有些人拥有用户帐户和角色（教师或学生）。他们是一个班的参与者（一个班有很多学生和老师，一个学生有很多班，一个班有很多班）。我想我的class_instruction模式是关闭的DB，但请告诉我，如果它会工作，或是否有更好的方法（如可能与参与者has_many_through表）学生和班级老师

schema.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

我的担心是person_id是班级的一部分。它是否正确？

ClassInsturction.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

来源

2013-05-26 chris Frisina