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我有兩個車型之一是如何從外鍵約束檢索django模型的值?
class NewsLikes(models.Model):
id = models.IntegerField(db_column="id", max_length=11, help_text="")
userId = models.ForeignKey(Users, db_column='userId', max_length=11, help_text="")
newsId = models.ForeignKey(NewsMappings, db_column='newsMappingId', max_length=11, help_text="")
createdAt = models.DateTimeField(db_column='createdAt', auto_now=True, help_text="
,另一個模式是
class NewsMappings(models.Model):
id = models.IntegerField(db_column="id", max_length=11, help_text="")
newsId = models.ForeignKey(News, db_column='newsId', max_length=11, help_text="")
boardId = models.ForeignKey(Boards, db_column='boardId', max_length=11, help_text="")
isWallPost = models.BooleanField(db_column="isWallPost", default=False, help_text="")
模型消息像包含消息映射的外鍵。我在我的django模板中傳遞新聞映射作爲上下文,我想要統計新聞映射中存在多少新聞喜歡ID並將其顯示在模板上。