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Django 的多對多關係範例
Django ORM ( Object-relational mapping ) 提供了簡便的方法存取資料庫，
之前也提到過 Django 資料庫的基礎
在資料庫模型中，
部分欄位是有相關性的，
在 Django 中分為一對一，多對多，一對多三種關係，
今天要來介紹的就是：
Django 的多對多關係範例
多對多關係的例子很多，
以書籍分類來說，
一本書可以有很多種分類，
而一個分類可以有很多書，
這就是屬於多對多關係。
舉個例子來說，
笑傲江湖在分類上屬於武俠小說類，
而武俠小說類除了笑傲江湖以外還有射鵰英雄傳…等等，
所以分類名與書名間就是多對多關係。
上圖為今天的範例，
課程與學生屬於多對多關係，
故在定義課程時，設定一個欄位為 ManyToManyField，
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