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在 Django 1.7 中编写一个简单的应用程序。是表示链表元素的模型:
class TrainingUserWordSetItem(models.Model):
training_set = models.ForeignKey(TrainingUserWordSet)
user_word = models.ForeignKey(UserWord)
prev_item = models.ForeignKey("TrainingUserWordSetItem", null=True, default=None)
next_item = models.ForeignKey("TrainingUserWordSetItem", null=True, default=None)
迁移时出现错误:
hellodict.TrainingUserWordSetItem.next_item: (fields.E304) Reverse accessor for 'TrainingUserWordSetItem.next_item' clashes with reverse accessor for 'TrainingUserWordSetItem.prev_item'.
HINT: Add or change a related_name argument to the definition for 'TrainingUserWordSetItem.next_item' or 'TrainingUserWordSetItem.prev_item'.
hellodict.TrainingUserWordSetItem.prev_item: (fields.E304) Reverse accessor for 'TrainingUserWordSetItem.prev_item' clashes with reverse accessor for 'TrainingUserWordSetItem.next_item'.
HINT: Add or change a related_name argument to the definition for 'TrainingUserWordSetItem.prev_item' or 'TrainingUserWordSetItem.next_item'.
如何制作两个自引用外键字段?
更新:
帮助使用 related_name='+':
class TrainingUserWordSetItem(models.Model):
training_set = models.ForeignKey(TrainingUserWordSet)
user_word = models.ForeignKey(UserWord)
prev_item = models.ForeignKey("TrainingUserWordSetItem", null=True, default=None)
next_item = models.ForeignKey("TrainingUserWordSetItem", null=True, default=None, related_name='+')