# 普通字段name= models.charfield(max_lenth=20)
# 一對多欄位，foreignkey
name= models.foreignkey(tablename, on_delete="", related_name=none)
# 多對多字段，manytomanyfield()
name= models.manytomanyfield(tablename, )
# 正向查詢：主表直接查詢關聯表內容在serializers.charfield欄位中，新增source引數, 格式為source = '外來鍵.某欄位'
course_name = serializers.charfield(source='course.title',required=false)
# 反向查詢：關聯表通過外來鍵查詢主表內容
class chaptersserializer(serializers.modelserializer):
# 正向查詢，找到課程表
# course_name = serializers.charfield(source='course.title',required=false)
# 反向查詢，找到節表對應的資訊
sections = sectionsserializer(many=true)
class meta:
fields = '__all__'
model = models.chapters
class sectionsserializer(serializers.modelserializer):
class meta:
fields = '__all__'
model = models.sections
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