Django 中 related_name/related_query_name 的區別

related_name/related_query_name 一般出現在有 Foreignkey  或者 Manytomang 字段的時候

一 一般查詢

class Department(models.Model):
 　　title = models.CharField(verbose_name='部門',max_length=32)

class UserInfo(models.Model):
 　　depart = models.ForeignKey(verbose_name='部門',to='Department')
 　　user = models.CharField(verbose_name='用戶',max_length=32)
 　　pwd = models.CharField(verbose_name='用戶', max_length=32)

以前查詢

正向查詢---用點
 user_object = UserInfo.objects.get(id=1)
 user_object.depart
反向查詢---表名小寫+set
 depart_object = Department.objects.get(id=9)
 depart_object.userinfo_set.all()

二  如果是 related_query_name

class Department(models.Model):
 title = models.CharField(verbose_name='部門',max_length=32)

class UserInfo(models.Model):
 depart=models.ForeignKey(verbose_name='部門',to='Department',related_query_name="u")
 user = models.CharField(verbose_name='用戶',max_length=32)
 pwd = models.CharField(verbose_name='用戶', max_length=32)

再查詢

正向查詢---用點
 user_object = UserInfo.objects.get(id=1)
 user_object.depart
反向查詢---表名小寫+set
 depart_object = Department.objects.get(id=9)
 depart_object.u_set.all()

三 如果是 related_name的話

class Department(models.Model):
 title = models.CharField(verbose_name='部門',max_length=32)

class UserInfo(models.Model):
 depart=models.ForeignKey(verbose_name='部門',to='Department',related_name="u")
 user = models.CharField(verbose_name='用戶',max_length=32)
 pwd = models.CharField(verbose_name='用戶', max_length=32)

再查詢

正向查詢---用點
 user_object = UserInfo.objects.get(id=1)
 user_object.depart
反向查詢---表名小寫+set
 depart_object = Department.objects.get(id=9)
 depart_object.u.all()